Performance Investigaton And Optimization Of Helicopter Inertial Particle Separator

Helicopter mobility,landing convenience and hover characteristics,can work in a variety of special conditions,so it is widely used in rescue,search and transportation.It is precisely because of the diverse and varied operating environment,so helicopters often work in harsh conditions,for example,work in the desert,lake and snow,will lead to solid particles into the engine inlet,which will seriously affect the engine’s operational safety,efficiency and service life.In order to alleviate the harsh environment caused the helicopter engine damage,the current method is generally used intake air purification device installation inform the engine,the most used is the integral inertial particle separator.Integral inertial particle separator is the use of particle inertia characteristics of a larger flow to the appropriate changes,so that the particles through the removal of discharge channel.In this paper,the numerical analysis of the integral inertial particle separator with blade is carried out,the performance of the particle separator under different conditions is evaluated,and the flow path of the particle separator is optimized to find the better channel model,the main contents are as follows:1.The effects of different particle diameters,particle inlet velocities and scavenging ratios on the performance of the particle separator were studied.The results showed that with the increase of particle diameter,the separation efficiency increased first and then decreased,and the separation efficiency was higher at 20μm to 50μm;The larger the particle inlet velocity,the lower the separation efficiency;the higher the scavenging ratio,the smaller the total pressure loss and the greater the static pressure recovery coefficient.2.The influence of the clearance angle,inlet flow path and blade consistency of the main flow passage on the performance of the separator was investigated.The clearance angle of the clearance vanes should be matched with the volute geometry,the inlet pre-rotating blade cascade will be thicker,the separation efficiency will increase and the total pressure loss will decrease first and then increase;Large,the particle separation efficiency has little effect,but the total pressure loss increases.3.The roughness sensitivity analysis of the particle separator wall is carried out without considering the blade.The results show that the roughness has little effect on the separation efficiency,and the total pressure loss increases with the increase of the roughness.The influence of the roughness on the outer wall of the main channel,the inner wall of the main channel and the other wall is not obvious.4.On the basis of the performance study,the multi-objective optimization of flow channel profile is carried out.Based on the Pareto optimization theory and the Kriging agent model,the UG,ICEM,CFX and other software are coupled to build an optimization platform using MATLAB to form a system of automatically collecting samples,parameterizing modeling,finding the optimal boundary and finding the optimal solution.The outer wall of the runner,the inner wall of the runner and the outer wall of the main channel are optimized respectively.Then the inner wall of the runner and the outer wall of the main channel are optimized to obtain the theory of the channel optimization theory.In this paper,the basic performance of the particle separator is obtained through detailed numerical simulation,which not only provides data support for the study of particle separator,but also provides reference for other types of inertia particle separators.On the other hand,through the construction of optimization platform,and the analysis of optimization results,this paper will provide technical reference for future design of particle separator.