Research Of Aeroengine Compressor Flow Field Characteristics And Performance Influenced By Fog And Haze

In recent years,haze occurred frequently as the air pollution become more and more serious.While aircrafts using air as their carrier,the most critical component of aircraft which haze impact on is the compressor,which have been operating in haze environments for a long period of time can easily cause performance degradation and shorten their service life.In order to make a reasonable maintenance plan and conduct a maintenance interval,it is very important to study the influence of haze on the performance and characteristics of compressor.Refer to research method,Rotor 37,which is a transonic compressor,will be used to carry out the numerical simulation of the three-dimensional flow field.First of all,using BladeGen to establish a three-dimensional model of the leaf and verify its accuracy.Then through the analysis of the physicochemical properties of typical haze particles and finally established the JBPS model as the equivalent model of haze particles.The main influence of haze particles on the flow field of the compressor includes two aspects: two-phase flow and dirt deposition.Particle orbit model is used to study the effect of two-phase flow on the performance of compressor,and the effect of fouling on the flow field characteristics of compressor is simulated by modifying the surface roughness of the compressor blade,the surface thickness of the blade and increasing the random size on it.The simulation results of two-phase flow show that the haze particles will cause the performance of the compressor to decrease,and the flow characteristic curve slightly deviates from the design value,which indicates that the two-phase flow has less influence on the performance of the compressor.While the increase of the blade surface roughness will significantly reduce the performance,resulting in the downward shift of the characteristic line,the increase of the blade thickness will lead to the reduction of the stable working range of the compressor,and the movement of the characteristic line to the direction of low mass flow;finally,the simulation of dirt deposition on the blade surface will be further simulated by adding random size to the blade surface.The influence of the flow field on the machine shows that the haze fouling will lead to a significant decrease on the performance of the compressor,a reduction in the stable working range,and a tendency to cause rotation stall.This is the most critical factor in the performance degradation of the compressor due to the haze.