叶片数和分流叶片长度对压气机性能的影响研究

Study on the effects of blade number and splitter blade length on compressor performance

以某型离心式压气机为研究对象,利用ANSYS工程软件对叶轮进行数值模拟。在分析内部流场的基础上,探究叶片数和分流叶片长度对离心式压气机性能的影响。结果显示,叶片数过多会使叶轮流动摩擦损失增加,从而降低等熵效率。叶片数过少,容易造成叶片载荷增加,从而缩短叶轮寿命。分流叶片过长或者过短均会使叶轮流场分布不均匀,从而使其等熵效率降低。最终得出结论:叶轮的最佳叶片数为7对叶片,叶轮最佳分流叶片长度为长叶片的0.813倍,此时,压气机增压比为3.81,等熵效率为66.82%。

The impeller of a centrifugal compressor was used as the research object,the impeller was numerically simulated by ANSYS engineering software.Based on the analysis of the internal flow field,the effects of the number of blades and the length of the splitter blades on the performance of the centrifugal compressor were investigated.The results show that too many blades will increase the frictional loss of the impeller,thus reducing the isentropic efficiency.If the number of blades is too small,the blade load is likely to increase,thereby shortening the life of the impeller.If the splitter blades are too long or too short,the impeller flow field will be unevenly distributed,which will reduce the isentropic efficiency.Finally,it is concluded that the optimal number of blades of the impeller is 7 pairs of blades,and the optimal splitter blade length is 0.813 times of the long blade.At this time,the compressor pressure ratio is 3.81 and the isentropic efficiency is 66.82%.