摘要
以一高压比离心压气机级为研究对象,设计制造了三种不同的扩压器,采用实验和数值方法研究了扩压器进口安装角和叶片型线对级性能的影响。结果表明,扩压器进口安装角减小时,性能曲线向小流量区移动,最高效率和压比降低。采用低稠度机翼形扩压器时,级工况范围稍有扩展,但效率和压比显著降低。流场分析显示,进口安装角减小时,扩压器凸面流动分离区扩大,堵塞流道且增大损失。采用低稠度机翼形扩压器时,扩压器内更容易产生大尺度分离涡。
Three vaned diffusers for a high-pressure-ratio centrifugal compressor are designed,and the effects of inlet blade angle and blade profile of diffuser on the stage performance are investigated by the experiment and numerical simulations.The results show that,the decrease of inlet blade angle makes the performance curve move towards the low flow rate side,and the little drops of the peak stage efficiency and pressure ratio can be detected.The low-solidity airfoil diffuser can enlarge the operating range of stage,but decreases the stage efficiency and pressure ratio remarkably.The further flow analysis show that,decreasing the inlet blade angle leads to the spread of flow separation zone,the blockage of flow channels and the increase of losses.The large-scale flow separation is more likely to generate when the low-solidity airfoil diffuser is adopted.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第1期84-88,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51236006)
关键词
叶片扩压器
进口安装角
型线
性能
vaned diffuser
inlet blade angle
blade profile
performance
