Effect of high negative incidence on the performance of a centrifugal compressor stage with conventional vaned diffusers

作     者：Ahti Jaatinen Aki Grnman Teemu Turunen-Saaresti Jari Backman 

作者机构：Lappeenranta University of Technology 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2011年第20卷第2期

页      面：97-105页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：the financial support of the Academy of Finland  the Finnish Funding Agency for Technology and Innovation - TEKES  and Cardo Production Finland Oy (former High Speed Tech Oy Ltd.) 

主　　题：centrifugal compressor vaned diffuser efficiency performance flow field 

摘      要：Three vaned diffusers, designed to have high negative incidence (-8°) at the design operating point, are studied experimentally. The overall performance (efficiency and pressure ratio) are measured at three rotational speeds, and flow angles before and after the diffuser are measured at the design rotational speed and with three mass flow rates. The results are compared to corresponding results of the original vaneless diffuser design. Attention is paid to the performance at lower mass flows than the design mass flow. The results show that it is possible to improve the performance at mass flows lower than the design mass flow with a vaned diffuser designed with high negative incidence. However, with the vaned diffusers, the compressor still stalls at higher mass flow rates than with the vaneless one. The flow angle distributions after the diffuser are more uniform with the vaned diffusers.