【摘要】 本文将叶轮、无叶扩压器和弯道组合一起对弯道进行研究,充分考虑了叶轮出口的射流/尾迹结构对弯道进口气流的影响.通过对不同弯道半径r与流道宽度b的比值r/b条件下,数值研究其对离心压缩机基本级气动性能的影响.对弯道内部流动及r/b值变化与离心压缩机级的总体性能的变化关系进行详细的对比分析.研究结果表明:r/b值的变化对弯道出口气流角影响显著,并存在一个使级效率为最大值的最佳r/b值。壁面摩擦是引起弯道内部总压损失的主要因素。更多还原

【Abstract】 A numerical investigation on flow in bend coupling impeller and vaneless diffuser in the centrifugal compressor with different ratios rib of bend radius r to bend channel width b is presented. The jet-wake effect of impeller outlet is considered and the flow analysis in the bend and the perfor- mance of the centrifugal compressor stage are investigated.The results indicate that there has been an optimal value of r/b to make efficiency of the stage to the highest for specific compressor stage. with change of r/b,It significantly affects the flow angle of bend outlet.The prime reason of causing the total pressure loss in bend is the wall friction in the bend channel.更多还原