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建立表征离心压气机叶轮积垢分布的粗糙度模型,在叶片表面生成三维、非均匀分布的粗糙带,数值研究干净和积垢状态下叶轮的气动性能和内部流场,并通过敏感性分析,找到对叶轮气动性能影响最大的积垢区域。结果表明:积垢叶轮的多变效率和总压比较干净叶轮均有显著下降;随着流量增大,性能衰减愈发明显;离心压气机叶片前缘靠近叶顶部位为气动性能对积垢的最敏感区域.研究工作为离心压气机的鲁棒设计优化奠定了理论基础。
A roughness model was established to characterize the fouling distribution of the centrifugal compressor impeller. Three-dimensional and unevenly distributed rough bands were generated on the blade surface. The aerodynamic performance and internal flow field of the impeller were numerically studied. Through sensitivity analysis, Find the largest area of aerodynamic performance of the impeller fouling. The results show that the changeable efficiency and the total pressure of the fouling impeller decrease significantly compared with that of the clean impeller. As the flow rate increases, the performance degradation becomes more obvious. The leading edge of the centrifugal compressor blade near the top of the blade is the aerodynamic performance of fouling The most sensitive area.Research work laid the theoretical foundation for the robust design optimization of centrifugal compressor.