CFD analysis of flank clearance sizes on micro-scale transcritical CO
The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat reco...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Du, Yuheng [verfasserIn] Pekris, Michael [verfasserIn] Tian, Guohong [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2023 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Applied thermal engineering - Amsterdam [u.a.] : Elsevier Science, 1996, 232 |
|---|---|
| Übergeordnetes Werk: |
volume:232 |
| DOI / URN: |
10.1016/j.applthermaleng.2023.120980 |
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| Katalog-ID: |
ELV06090335X |
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| 245 | 1 | 0 | |a CFD analysis of flank clearance sizes on micro-scale transcritical CO |
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| 520 | |a The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. | ||
| 650 | 4 | |a Scroll expander | |
| 650 | 4 | |a Flank clearance | |
| 650 | 4 | |a Pressure imbalance | |
| 700 | 1 | |a Pekris, Michael |e verfasserin |0 (orcid)0000-0002-8700-5749 |4 aut | |
| 700 | 1 | |a Tian, Guohong |e verfasserin |0 (orcid)0000-0002-0268-0383 |4 aut | |
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| 936 | b | k | |a 52.43 |j Kältetechnik |q VZ |
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10.1016/j.applthermaleng.2023.120980 doi (DE-627)ELV06090335X (ELSEVIER)S1359-4311(23)01009-8 DE-627 ger DE-627 rda eng 690 VZ 52.43 bkl 52.52 bkl 52.42 bkl 50.38 bkl Du, Yuheng verfasserin aut CFD analysis of flank clearance sizes on micro-scale transcritical CO 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. Scroll expander Flank clearance Pressure imbalance Pekris, Michael verfasserin (orcid)0000-0002-8700-5749 aut Tian, Guohong verfasserin (orcid)0000-0002-0268-0383 aut Enthalten in Applied thermal engineering Amsterdam [u.a.] : Elsevier Science, 1996 232 Online-Ressource (DE-627)320594122 (DE-600)2019322-1 (DE-576)256146322 1359-4311 nnns volume:232 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 52.43 Kältetechnik VZ 52.52 Thermische Energieerzeugung Wärmetechnik VZ 52.42 Heizungstechnik Lüftungstechnik Klimatechnik VZ 50.38 Technische Thermodynamik VZ AR 232 |
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10.1016/j.applthermaleng.2023.120980 doi (DE-627)ELV06090335X (ELSEVIER)S1359-4311(23)01009-8 DE-627 ger DE-627 rda eng 690 VZ 52.43 bkl 52.52 bkl 52.42 bkl 50.38 bkl Du, Yuheng verfasserin aut CFD analysis of flank clearance sizes on micro-scale transcritical CO 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. Scroll expander Flank clearance Pressure imbalance Pekris, Michael verfasserin (orcid)0000-0002-8700-5749 aut Tian, Guohong verfasserin (orcid)0000-0002-0268-0383 aut Enthalten in Applied thermal engineering Amsterdam [u.a.] : Elsevier Science, 1996 232 Online-Ressource (DE-627)320594122 (DE-600)2019322-1 (DE-576)256146322 1359-4311 nnns volume:232 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 52.43 Kältetechnik VZ 52.52 Thermische Energieerzeugung Wärmetechnik VZ 52.42 Heizungstechnik Lüftungstechnik Klimatechnik VZ 50.38 Technische Thermodynamik VZ AR 232 |
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10.1016/j.applthermaleng.2023.120980 doi (DE-627)ELV06090335X (ELSEVIER)S1359-4311(23)01009-8 DE-627 ger DE-627 rda eng 690 VZ 52.43 bkl 52.52 bkl 52.42 bkl 50.38 bkl Du, Yuheng verfasserin aut CFD analysis of flank clearance sizes on micro-scale transcritical CO 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. Scroll expander Flank clearance Pressure imbalance Pekris, Michael verfasserin (orcid)0000-0002-8700-5749 aut Tian, Guohong verfasserin (orcid)0000-0002-0268-0383 aut Enthalten in Applied thermal engineering Amsterdam [u.a.] : Elsevier Science, 1996 232 Online-Ressource (DE-627)320594122 (DE-600)2019322-1 (DE-576)256146322 1359-4311 nnns volume:232 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 52.43 Kältetechnik VZ 52.52 Thermische Energieerzeugung Wärmetechnik VZ 52.42 Heizungstechnik Lüftungstechnik Klimatechnik VZ 50.38 Technische Thermodynamik VZ AR 232 |
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10.1016/j.applthermaleng.2023.120980 doi (DE-627)ELV06090335X (ELSEVIER)S1359-4311(23)01009-8 DE-627 ger DE-627 rda eng 690 VZ 52.43 bkl 52.52 bkl 52.42 bkl 50.38 bkl Du, Yuheng verfasserin aut CFD analysis of flank clearance sizes on micro-scale transcritical CO 2023 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. Scroll expander Flank clearance Pressure imbalance Pekris, Michael verfasserin (orcid)0000-0002-8700-5749 aut Tian, Guohong verfasserin (orcid)0000-0002-0268-0383 aut Enthalten in Applied thermal engineering Amsterdam [u.a.] : Elsevier Science, 1996 232 Online-Ressource (DE-627)320594122 (DE-600)2019322-1 (DE-576)256146322 1359-4311 nnns volume:232 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2106 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 52.43 Kältetechnik VZ 52.52 Thermische Energieerzeugung Wärmetechnik VZ 52.42 Heizungstechnik Lüftungstechnik Klimatechnik VZ 50.38 Technische Thermodynamik VZ AR 232 |
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690 VZ 52.43 bkl 52.52 bkl 52.42 bkl 50.38 bkl CFD analysis of flank clearance sizes on micro-scale transcritical CO Scroll expander Flank clearance Pressure imbalance |
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CFD analysis of flank clearance sizes on micro-scale transcritical CO |
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cfd analysis of flank clearance sizes on micro-scale transcritical co |
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CFD analysis of flank clearance sizes on micro-scale transcritical CO |
| abstract |
The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. |
| abstractGer |
The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. |
| abstract_unstemmed |
The scroll-type expander can be the promising candidate for micro-scale (<10 kW) transcritical CO 2 waste heat recovery power system. The performance of the expander significantly depends on the flank clearance design. The current paper provides a transient CFD analysis for transcritical CO 2 scroll expander, which includes 19 flank clearance sizes from 20 to 200 μ m. The results showed that increasing the flank clearance led to a significant exergy efficiency drop from 89.13% to 46.72%. Although large flank clearance is normally perceived as negative, it indeed eliminates the possibility of over-expansion. The “turning point” for the selected expander geometry is roughly around 40 μ m. Excessive flank clearance enlargement resulted in a severe under-expansion issue, and the average expansion ratio was reduced from 3.19 to 1.8. The velocity of leakages also increased from 90 to 370 m/s due to the increased pressure differences. The pressure imbalance issue between two symmetrical working processes got continuously optimised by increasing the flank clearance. The optimal flank clearance range of 100 to 150 μ m has been established with appropriate pressure balance and efficiency. This paper provides useful insights and design guidelines in the sizing of operational flank clearances for transcritical CO 2 scroll expander. The micro-scale (grid) power plant has the potential to change the energy structure considering grid stability and load balancing, and the performance of micro-scale expanders is the key to achieving the objective. |
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| score |
7.4018707 |