多级轴流压气机吸雨性能变化的数值研究

Numerical Study on Rain Ingestion Performance Variation of Multi-stage Axial Compressor

为了研究吸雨对轴流压气机性能和稳定性的影响,以某型三级轴流压气机为研究对象,利用CFD软件针对不同吸雨量及雨滴颗粒直径进行了两相流数值模拟。研究结果发现:雨水的吸入会不同程度地降低压气机的总压比、总温比及效率等性能参数,在相同吸雨量的情况下雨滴颗粒的直径变化对压气机性能影响较小,而性能的恶化程度会随着吸雨量的增大而大幅度增大;雨水的吸入会影响压气机的气动参数,影响各级间的性能匹配,雨水的吸入会不同程度上改变各级的进口气流角,对后两级的影响较大;雨水吸入使动叶叶根处的反动度变小,叶顶处的反动度变大,从而改变各级间动静叶的负荷分配,降低压气机的效率。

In order to study the influence of rain ingestion on the performance and stability of axial compressor,a certain 3-stage axial compressor is taken as the research object to conduct the numerical simulation of two-phase flow for different rainfall ingestion and rain droplet particle diameters by CFD software.The research result shows that rain ingestion can reduce the compressor performance parameters such as total pressure ratio,total temperature ratio and efficiency in different degrees.Under the same rain ingestion condition,the changes of rain droplet particle diameters have little effect on compressor performance,while the deterioration degree of performance will increase significantly with the increase of rainfall ingestion.Rain ingestion will affect the pneumatic parameters of the compressor and the performance match between different stages.Rain injection will change the inlet airflow angle of each stage in different degrees,and the influence on the latter two stages is more significant.Rain ingestion makes the reaction degree at the root of rotor blade become smaller,and makes the reaction degree at the tip of rotor blade become larger,which change the load distribution between rotor blades and stator blades at all stages and reduce the efficiency of compressor.