离心压气机流动控制机匣新型处理方式研究

为了提高某带小叶片离心压气机的稳定裕度,采用了新型的机匣处理方式,对机匣处理前后的压气机流场进行了数值模拟分析。计算结果表明:(1)在机匣处理后,离心压气机稳定特性得到一定的改善,失速点向小流量方向拓展,压气机流量裕度在100%设计转速下提高了3.5%,在90%设计转速下提高了2.5%;(2)在机匣处理后,相同流量下的压气机压比特性和效率特性都有一定程度的损失,流量在100%设计转速下小于2.15kg/s,在90%设计转速下小于2.00kg/s时,最大效率分别下降了约1.7%和约2.5%。

Study on New Type Casing Treatment Method for Centrifugal Compressor

In order to improve the stability margin of the centrifugal compressor with splitter blade,the new type casing treatment method was adopted,and numerical simulation of compressor flowfield was conducted with and without casing treatment.The calculation show that：（1） the stability of the centrifugal compressor is improved with the casing treatment,the stall point extends to the small flow direction,and the flow margin is extended by 3.5 % and 2.5 % respectively at 100 % and 90 % design speed.（2） The pressure ratio characteristic and efficiency characteristic at the same mass flow decreased with casing treatment.The pressure ratio and efficiency are decreased at the 2.15 kg/s of mass flow and 100 % design speed and at 2.00 kg/s of mass flow and 90 % design speed.The maximum efficiency decreased by 1.7 % and 2.5 % respectively at 100 % and 90 % design speed.