摘要
用数值模拟的方法研究了某离心压缩机叶轮速度系数对离心压缩机级性能的影响,并分析了不同速度系数下叶轮流道内部的流动情况.研究结果表明:在叶轮轮盘的相对曲率半径大于0.3时,叶轮速度系数的减小能改善叶轮流道内部的流体流动,使叶片进口从盘侧指向盖侧的静压梯度降低,同时叶轮出口通流速度不均匀程度得到改善,因此使得离心压缩机的级效率得到明显提高,在设计流量下等熵效率最大提高1.5%以上.通过对不同速度系数的压缩机级的变工况性能进行分析,发现速度系数的减小使得压缩机效率曲线右移,压比曲线上移,并有效地扩大了离心压缩机的工况范围.
The effect of impeller velocity factor Kc of a centrifugal compressor on the performance of centrifugal compressor stages was investigated by numerical simulation, and the effect of Kc on the impeller inflow pattern was analyzed. The result shows that the decrease of Kc can meliorate the flow field in the impeller when the value of r/b1 is larger than 0.3; the gradient of static pressure along hub to shroud at the inlet of blade is decreased and the fluid meridional velocity becomes more uniform at the outlet of impeller, so the efficiency of the centrifugal compressor stage can be improved significantly, the maximum improvement of isentropic efficiency is beyond 1.5 percents. In addition, the analysis on the performance of compressor stages with different Kc indicates that efficiency curve of the compressor stage moves to the right side and the pressure ratio curve moves to the upward with the decrease of Kc, and the operation range of the centrifugal compressor can also be extended.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第7期807-810,924,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50476055)
国家高技术研究发展计划资助项目(2006AA05Z220)
关键词
速度系数
离心压缩机
数值模拟
velocity factor
centrifugal compressor
numerical simulation
