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Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system
Wang X; Li W; Zhang XH; Zhu YL; Qin W(秦伟); Chen HS
Source PublicationPROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
2018-09-01
Volume232Issue:6Pages:622-640
ISSN0957-6509
AbstractCompressed air in supercritical compressed air energy storage system expand from supercritical to atmospheric conditions at lower inlet temperature (<500K) to generate MW scale power. Therefore, a new multistage radial turbine is adopted and the flow characteristic is investigated by numerical simulation. Effects of ideal gas model and tip clearance on the performance and flow field of the multistage turbine are revealed. Results show that ideal gas model can reveal flow pattern under supercritical condition correctly while leading to obvious deviation of isentropic enthalpy drop, entropy, and inlet-to-exit total temperature ratio. Relative differences for mass flow and efficiency are less than 2%, while the relative differences for output power reaches to 9.36%. For shrouded rotor, mixing of working fluid near hub, blade suction surface, and shroud is the main influencing factor of the flow loss in the rotor. For unshrouded rotor, leakage vortex promote mixture of the fluid deriving from the hub, shroud, and suction surface, and causes much higher flow loss in the channel of rotor. The rotors, which have higher blade height variation rate, present higher efficiency reduction when the tip clearance height is increased, which is because the proportion of tip clearance in blade inlet height increases with the increase of average aspect ratio, resulting in the increase of leakage flow at the leading edge of rotor blade. The pressure fluctuation near the tip clearance and efficiency reduction is also increased. The present study provides a reference for further design and optimization of the multistage radial turbines in compressed air energy storage.
KeywordCompressed air energy storage multistage radial turbine computational fluid dynamics
DOI10.1177/0957650917743366
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000443311900004
WOS KeywordDESIGN
WOS Research AreaThermodynamics ; Engineering, Mechanical
WOS SubjectThermodynamics ; Engineering
Funding OrganizationNational Natural Science Foundation of China [51522605, 51406206] ; Key Project of Chinese National Programs for Fundamental Research, Development (973 program) [2015CB251302] ; CAS Interdisciplinary Innovation Team Fund
ClassificationQ4
Ranking5
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77950
Collection职能与支撑部门
Affiliation1.Chinese Acad Sci, Inst Engn Thermophys, 11 Beisihuanxi Rd, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Mech, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wang X,Li W,Zhang XH,et al. Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system[J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,2018,232(6):622-640.
APA Wang X,Li W,Zhang XH,Zhu YL,秦伟,&Chen HS.(2018).Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,232(6),622-640.
MLA Wang X,et al."Flow characteristic of a multistage radial turbine for supercritical compressed air energy storage system".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232.6(2018):622-640.
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