Use of partially shrouded impeller in a small centrifugal compressor  

作　　者：Teemu Turunen-Saaresti JaakkoLarjola 

机构地区：[1]Department of Energy and Environmental Technology,Lappeenranta University of Technology,Lappeenranta,Finland

出　　处：《Journal of Thermal Science》2008年第1期21-27,共7页热科学学报（英文版）

基　　金：National Technology Agency of Finland(TEKES)

摘　　要：Numerical analysis is conducted for the 3-dimensional impeller and vaneless diffuser of a small centrifugal com- pressor. The influence of impeller tip clearance on the flow field of the impeller is investigated. Detailed investigation on the leaking flow across the tip clearance of the impeller shows that the leaking flow rate is higher near the exit of the impeller than that near the inlet of the impeller. Based on this phenomenon, a new partially shrouded impeller is designed. The impeller is shrouded near the exit of the impeller. Numerical results show that the secondary flow region becomes smaller at the exit of the impeller. Better performance is achieved than that with the unshrouded impeller.

关 键 词：centrifugal compressor tip clearance partial shroud CFD. 

分 类 号：TH452[机械工程—机械制造及自动化]