DocumentCode :
1989767
Title :
The mechanism of propagation of tip clearance flow and corner separation in high temperature silicon based micro compressor
Author :
Arshad, Ali ; Qianwei Sun ; Qiushi Li
Author_Institution :
Sch. of Energy & Power Eng., Beihang Univ., Beijing, China
fYear :
2015
fDate :
13-17 Jan. 2015
Firstpage :
365
Lastpage :
374
Abstract :
This study is focused on the mechanism of propagation of tip clearance flow and corner separation of a high speed, low Reynolds number millimeter size centrifugal compressor passage in a situation with high temperature wall. The physical basis of increasing tip clearance vortex and corner separation vortex, on blade suction surface, is explained by the severe effects when heat transfer is considered through high temperature wall. Furthermore it induces severe performance deterioration in micro compressor. In this paper, an isothermal blade temperature boundary condition is applied for a comparison with adiabatic case. A series of steady three dimensional RANS numerical simulations are carried out to study the secondary flow characteristics through detailed analysis of typical flow features. CFD results show a decrease in compression capability and drop in efficiency due to a large tip clearance vortex and a large corner separation vortex, caused by an absolute velocity change when flow passes through heated passage. Therefore a favorable Mach number distribution is also discussed to achieve a high performance of high temperature silicon based micro compressor.
Keywords :
Mach number; Navier-Stokes equations; blades; compressors; computational fluid dynamics; heat transfer; numerical analysis; separation; vortices; CFD; Mach number distribution; blade suction surface; centrifugal compressor passage; compression capability; corner separation vortex; heat transfer; heated passage; high temperature silicon; isothermal blade temperature boundary condition; microcompressor; performance deterioration; propagation mechanism; secondary flow characteristics; steady three dimensional RANS numerical simulations; tip clearance flow propagation; tip clearance vortex; Heating; Ice; Lead; Shafts; Stress;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Sciences and Technology (IBCAST), 2015 12th International Bhurban Conference on
Conference_Location :
Islamabad
Type :
conf
DOI :
10.1109/IBCAST.2015.7058530
Filename :
7058530
Link To Document :
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