离心叶轮长、短叶片参数对压缩机性能影响分析

Effect of Long and Short Blade Parameters of a Centrifugal Impeller on the Performance of the Compressor

对长、短叶片相对位置不同的离心压缩机叶轮进行数值计算,详细对比了五种叶轮的外部特性和内部流场分布。分析表明,长、短叶片相对位置不同对离心压缩机性能有很大的影响,当短叶片向长叶片吸力面旋转时,压比和效率都有所提高,改善了长叶片吸力面与短叶片压力面间通道的流动状况,有利于减少轮盖侧的通道涡和二次流现象,降低了流动损失。

A centrifugal compressor impeller was simulated numerically for different relative positions of long and short blades. Five kinds of impellers of its external characteristics and internal flow field distribution were compared. Analysis shows that when short blades rotate to the suction surface of long blades, compression ratio and efficiency are increased, the channel flow between suction surface of long blades and pressure surface of short blades is improved, which help reduce passage vortex, secondary flow on the wheel cover side and the flow loss.