Abstract：A numerical investigation on the flow in a bend channel by coupling the impeller with the vaneless diffuser in a centrifugal compressor with different r/b ratios (bend radius r to bend channel width b) is presented. The jet-wake effect of the impeller outlet is considered and flow pattern in the bend channel and the performance of the centrifugal compressor stage are investigated. The results indicate that there is an optimal r/b ratio for increasing the stage efficiency to the highest for a specific compressor stage. The change in r/b ratio significantly affects the flow angle of the bend channel outlet. The prime reason for the total pressure loss in the bend channel is the wall friction in the bend channel.
出版日期: 2008-12-05
引用本文:
. Optimal ratio of bend channel in centrifugal compressor[J]. Frontiers of Energy and Power Engineering in China, 2008, 2(4): 381-385.
WEN Suping, HU Xiaowen, LI Tingbin, ZHANG Yong, WANG Jun. Optimal ratio of bend channel in centrifugal compressor. Front. Energy, 2008, 2(4): 381-385.
Aungler R . Aerodynamicdesign and analysis of vaneless diffusers and return channels. ASME Paper No. 93-GT-101, New York, 1993
2
Davis W R . Three-dimensional boundary layer computation on the stationary end-wallsof centrifugal turbomachinery. T ASME JFluid Eng, 1976, 98: 431–442
3
Akaike S, Toyokura T . Flow in interstage returnbend of centrifugal turbomachinery. In: Kisbocskoi L, Szabo A, eds. Proceedings of the 6th Conference on Fluid Machinery . Budapest, Hungary, 1979, 11–20
4
Oh J M, Engeda A . A numerical study of theU-turn bend in return channel systems for multistage centrifugal compressors. J Mechanical Engineering Science, 2005, 219(8): 749–756
5
Inoue Y, Koizumi T . Experimental study on flowpatterns and losses in return passages for centrifugal compressor. ASME Fluid Eng Div, 1983, 3: 13–21
6
Lenke L J, Simon H . Numerical simulation of theflow through the return channel of multistage centrifugal compressors. In: 43rd IGTI-ASME Conference . Stockholm, Sweden, 1998, 10–19
7
Fister W, Zahn G, Tasche J . Theoretical and experimental investigations about vanelessreturn channels of multi-stage radial flow turbomachines. ASME paper 82-GT-209, 1982
