Minimum Quantity Lubrication Jet Noise: Passive Control

Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological...
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Autor*in:	Xiaodong Hu [verfasserIn] Junhao Yu [verfasserIn] Yuanlong Li [verfasserIn] Yu Xia [verfasserIn] Xuefeng Xu [verfasserIn] Ruochong Zhang [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	jet noise passive control micro-groove minimum quantity lubrication

Übergeordnetes Werk:	In: Micromachines - MDPI AG, 2010, 14(2023), 1814, p 1814
Übergeordnetes Werk:	volume:14 ; year:2023 ; number:1814, p 1814

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/mi14101814

Katalog-ID:	DOAJ093105452

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520			\|a Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles.
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allfields	10.3390/mi14101814 doi (DE-627)DOAJ093105452 (DE-599)DOAJb4b67cc1df284ff39f888d119fade0d9 DE-627 ger DE-627 rakwb eng TJ1-1570 Xiaodong Hu verfasserin aut Minimum Quantity Lubrication Jet Noise: Passive Control 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles. jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery Junhao Yu verfasserin aut Yuanlong Li verfasserin aut Yu Xia verfasserin aut Xuefeng Xu verfasserin aut Ruochong Zhang verfasserin aut In Micromachines MDPI AG, 2010 14(2023), 1814, p 1814 (DE-627)665016069 (DE-600)2620864-7 2072666X nnns volume:14 year:2023 number:1814, p 1814 https://doi.org/10.3390/mi14101814 kostenfrei https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 kostenfrei https://www.mdpi.com/2072-666X/14/10/1814 kostenfrei https://doaj.org/toc/2072-666X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2023 1814, p 1814
spelling	10.3390/mi14101814 doi (DE-627)DOAJ093105452 (DE-599)DOAJb4b67cc1df284ff39f888d119fade0d9 DE-627 ger DE-627 rakwb eng TJ1-1570 Xiaodong Hu verfasserin aut Minimum Quantity Lubrication Jet Noise: Passive Control 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles. jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery Junhao Yu verfasserin aut Yuanlong Li verfasserin aut Yu Xia verfasserin aut Xuefeng Xu verfasserin aut Ruochong Zhang verfasserin aut In Micromachines MDPI AG, 2010 14(2023), 1814, p 1814 (DE-627)665016069 (DE-600)2620864-7 2072666X nnns volume:14 year:2023 number:1814, p 1814 https://doi.org/10.3390/mi14101814 kostenfrei https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 kostenfrei https://www.mdpi.com/2072-666X/14/10/1814 kostenfrei https://doaj.org/toc/2072-666X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2023 1814, p 1814
allfields_unstemmed	10.3390/mi14101814 doi (DE-627)DOAJ093105452 (DE-599)DOAJb4b67cc1df284ff39f888d119fade0d9 DE-627 ger DE-627 rakwb eng TJ1-1570 Xiaodong Hu verfasserin aut Minimum Quantity Lubrication Jet Noise: Passive Control 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles. jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery Junhao Yu verfasserin aut Yuanlong Li verfasserin aut Yu Xia verfasserin aut Xuefeng Xu verfasserin aut Ruochong Zhang verfasserin aut In Micromachines MDPI AG, 2010 14(2023), 1814, p 1814 (DE-627)665016069 (DE-600)2620864-7 2072666X nnns volume:14 year:2023 number:1814, p 1814 https://doi.org/10.3390/mi14101814 kostenfrei https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 kostenfrei https://www.mdpi.com/2072-666X/14/10/1814 kostenfrei https://doaj.org/toc/2072-666X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2023 1814, p 1814
allfieldsGer	10.3390/mi14101814 doi (DE-627)DOAJ093105452 (DE-599)DOAJb4b67cc1df284ff39f888d119fade0d9 DE-627 ger DE-627 rakwb eng TJ1-1570 Xiaodong Hu verfasserin aut Minimum Quantity Lubrication Jet Noise: Passive Control 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles. jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery Junhao Yu verfasserin aut Yuanlong Li verfasserin aut Yu Xia verfasserin aut Xuefeng Xu verfasserin aut Ruochong Zhang verfasserin aut In Micromachines MDPI AG, 2010 14(2023), 1814, p 1814 (DE-627)665016069 (DE-600)2620864-7 2072666X nnns volume:14 year:2023 number:1814, p 1814 https://doi.org/10.3390/mi14101814 kostenfrei https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 kostenfrei https://www.mdpi.com/2072-666X/14/10/1814 kostenfrei https://doaj.org/toc/2072-666X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2023 1814, p 1814
allfieldsSound	10.3390/mi14101814 doi (DE-627)DOAJ093105452 (DE-599)DOAJb4b67cc1df284ff39f888d119fade0d9 DE-627 ger DE-627 rakwb eng TJ1-1570 Xiaodong Hu verfasserin aut Minimum Quantity Lubrication Jet Noise: Passive Control 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles. jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery Junhao Yu verfasserin aut Yuanlong Li verfasserin aut Yu Xia verfasserin aut Xuefeng Xu verfasserin aut Ruochong Zhang verfasserin aut In Micromachines MDPI AG, 2010 14(2023), 1814, p 1814 (DE-627)665016069 (DE-600)2620864-7 2072666X nnns volume:14 year:2023 number:1814, p 1814 https://doi.org/10.3390/mi14101814 kostenfrei https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 kostenfrei https://www.mdpi.com/2072-666X/14/10/1814 kostenfrei https://doaj.org/toc/2072-666X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2023 1814, p 1814
language	English
source	In Micromachines 14(2023), 1814, p 1814 volume:14 year:2023 number:1814, p 1814
sourceStr	In Micromachines 14(2023), 1814, p 1814 volume:14 year:2023 number:1814, p 1814
format_phy_str_mv	Article
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topic_facet	jet noise passive control micro-groove minimum quantity lubrication Mechanical engineering and machinery
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container_title	Micromachines
authorswithroles_txt_mv	Xiaodong Hu @@aut@@ Junhao Yu @@aut@@ Yuanlong Li @@aut@@ Yu Xia @@aut@@ Xuefeng Xu @@aut@@ Ruochong Zhang @@aut@@
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callnumber-first	T - Technology
author	Xiaodong Hu
spellingShingle	Xiaodong Hu misc TJ1-1570 misc jet noise misc passive control misc micro-groove misc minimum quantity lubrication misc Mechanical engineering and machinery Minimum Quantity Lubrication Jet Noise: Passive Control
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topic_title	TJ1-1570 Minimum Quantity Lubrication Jet Noise: Passive Control jet noise passive control micro-groove minimum quantity lubrication
topic	misc TJ1-1570 misc jet noise misc passive control misc micro-groove misc minimum quantity lubrication misc Mechanical engineering and machinery
topic_unstemmed	misc TJ1-1570 misc jet noise misc passive control misc micro-groove misc minimum quantity lubrication misc Mechanical engineering and machinery
topic_browse	misc TJ1-1570 misc jet noise misc passive control misc micro-groove misc minimum quantity lubrication misc Mechanical engineering and machinery
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title	Minimum Quantity Lubrication Jet Noise: Passive Control
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title_full	Minimum Quantity Lubrication Jet Noise: Passive Control
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author_browse	Xiaodong Hu Junhao Yu Yuanlong Li Yu Xia Xuefeng Xu Ruochong Zhang
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title_sort	minimum quantity lubrication jet noise: passive control
callnumber	TJ1-1570
title_auth	Minimum Quantity Lubrication Jet Noise: Passive Control
abstract	Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles.
abstractGer	Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles.
abstract_unstemmed	Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators. In this study, a micro-grooved nozzle is proposed based on the noise reduction concept of biological micro-grooves. The flow field and acoustic characteristics of an original nozzle and a micro-grooved nozzle were investigated numerically to help better understand the noise reduction mechanism. The reasons for noise generation and the effects of the length (<i<L</i<), width (<i<W</i<) and depth (<i<δ</i<) of the micro-grooves on noise reduction were analyzed. It was found that jet noise is generated by the large-scale vortex ring structure and the pressure fluctuations caused by its motion. The overall sound pressure level (OASPL) decreased with the increases in <i<W</i< and <i<δ</i<, and increased with the increase in <i<L</i<. Among of them, <i<δ</i< has the greatest effect on noise reduction. The maximum noise reduction achieved was 6.66 dB, as verified by the OASPL test. Finally, the noise reduction mechanism was discussed in terms of the flow field, vorticity and the frequency characteristics. Micro-grooves can enhance the mixing of airflow inside the nozzle and accelerate the process of large-scale vortices breaking into smaller-scale vortices. It also reduces the sound pressure level (SPL) of middle frequencies, as well as the SPL of high frequencies on specific angles.
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title_short	Minimum Quantity Lubrication Jet Noise: Passive Control
url	https://doi.org/10.3390/mi14101814 https://doaj.org/article/b4b67cc1df284ff39f888d119fade0d9 https://www.mdpi.com/2072-666X/14/10/1814 https://doaj.org/toc/2072-666X
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author2	Junhao Yu Yuanlong Li Yu Xia Xuefeng Xu Ruochong Zhang
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