积垢对离心压气机性能的影响分析

Analysis of the Effect of Incrustation on Centrifugal Compressor Performance

以某型离心压气机为研究对象,利用流场仿真软件对不同污染程度的压气机性能进行数值计算,对比流场特性的变化,分析了积垢造成压气机性能损失的程度。结果表明:积垢对离心压气机性能的主要影响是降低压气机效率,原因是积垢改变了叶片表面粗糙度,增加了摩擦损失;扩大了叶片后缘和出口附近的低速回流区的范围,增强了回流强度,加大了流动损失。

The performance of centrifugal compressor before and after being polluted is numerically calculated by floating field simulation software. The mechanism of compressor performance deterioration caused by incrustation was analyzed by comparing the chance of compressor flow field. The result was that the main effects of incrusta- tion on centrifugal compressor was to reduce compressor efficiency, because incrustation changed the blade sur- face roughness, increased friction loss, expanded the low speed range near the trailing edge and outlet, en- hanced the backflow, and increased the flow loss.