Using tandem blades to break loading limit of highly loaded axial compressors  

作　　者：Baojie LIU Chuanhai ZHANG Guangfeng AN Du FU Xianjun YU 

机构地区：[1]Research Institute of Aero-Engine,Beihang University,Beijing 100083,China [2]School of Energy and Power Engineering,Beihang University,Beijing 100083,China [3]Gree Electric Appliances,Inc.of Zhuhai,Zhuhai 519070,China

出　　处：《Chinese Journal of Aeronautics》2022年第4期165-175,共11页中国航空学报（英文版）

基　　金：the support of National Natural Science Foundation of China(Nos.51806004 and 51790511);National Science and Technology Major Project,China(No.2017-Ⅱ-0001-0013)。

摘　　要：It is confirmed that tandem-blade configurations have potential to enlarge the flow turning in two-dimension(2D) studies. However, the potential of tandem blades to enlarge the design space for highly loaded axial compressors was rarely investigated in open literatures. The present work aims to show the capability of tandem blades to break the loading limit of conventional blades for highly loaded compressors. The 2D models of the maximum static pressure rise derived in previous work were validated by a large amount experimental data, which showed a good agreement. An E parameter was defined to evaluate the stall margin of compressor based on the theoretical models, which indicated that the tandem blade was able to increase the loading limit of axial compressors. A single-blade stage with a loading coefficient of 0.46(based on the blade tip rotating speed) was designed as the baseline case under the guidance of the E parameter. A tandem-blade stage was then designed by ensuring that the velocity triangles were similar to the single-blade stage. The performances of both stages were investigated experimentally. The results showed that the maximum efficiency of the tandem-blade stage was 92.8%, 1% higher than the single;the stall margin increased from 16.9% to 22.3%. Besides, the maximum pressure rise of tandem rotors was beyond the loading limit of 2D single-blade cascades, which confirmed the potential of tandem blades to break the loading limit of axial compressors.

关 键 词：CASCADES Highly loaded axial compressors Loading limit Single blades Tandem blades 

分 类 号：V232[航空宇航科学与技术—航空宇航推进理论与工程]