不同流量系数下叶顶间隙对离心压缩机模型级性能的影响

摘要

通过 CFD 技术，分析了不同流量系数下叶顶间隙对离心压缩机模型级性能的影响。结果表明，对于中、小流量系数模型级，叶顶间隙越大，其效率曲线下降越大，而对于大流量系数模型级，有一定的叶顶间隙可改善叶轮内流场，反而有利于离心压缩机效率性能。无论何种流量系数模型级，存在一定的叶顶间隙则可提升能头曲线。%The CFD technology is employed to numerically study the influence of blade tip clearance on the performance of centrifugal compressor models with different flow coefficients.The results show that the compressor efficiency is decreased as the increase of the blade tip clearance for the compressor models with both medium and small flow coefficients.However,as for the compressor models with large flow coefficient,the presence of blade tip clearance can be beneficial to the compressor effi-ciency due to the improved flow field.Besides,the blade tip clearance can generally help to increase the compressor energy head.