Analysis Of Solid Particles Erosion And Abrasion Of Centrifugal Compressor Impeller

Fluid machinery is a working device,which relies on the dynamic action of the blades on the rotating impeller to transfer energy to the continuous fluid.As a very typical fluid machinery,centrifugal compressors have been widely used in petrochemical,metallurgy,power generation,transportation and other industrial fields,and have an increasing impact on production and people’s lives.Since the solid particles exist in the medium environment,the high-speed airflow will entrain the solid particles and hit the blade at a specific speed and angle,which will cause the solid particles to erode and damage the blade.In the complex three-dimensional flow environment inside the centrifugal compressor impeller,solid particles inevitably collide and rub against the impeller blade wall,resulting in erosive wear and particle deposition on the impeller surface.If this situation continues,deformation and other forms of failure will further damage the aerodynamic performance of the compressor,resulting in varying degrees of decline in compressor performance,and have a negative impact on performance.In addition,due to lack of material（for example,impeller or blade damage due to unbalanced rotor,resonant vibration or concentrated stress）,the wear of solid particles on the impeller can also cause dynamic changes of the impeller.Therefore,it is very important to study the wear of centrifugal compressor particles on the impeller and related issues.In this paper,CFD is used to study the erosion and wear characteristics of compressor blade solids,as well as a method to predict blade erosion and wear under flow conditions.Using this method,the blade erosion and wear distribution can be obtained,and the impact can be explained.The distribution law of erosion and wear,and the influence of the particle diameter,particle mass flow and other factors on the erosion and wear of the blade are analyzed separately under other conditions,which provides a theoretical basis for the design of compressor blades and erosion prevention.The main work is as follows:（1）The Euler-Lagrangian two-phase flow model and the discrete impact model are used to simulate the erosion and abrasion of the gas-solid two-phase flow and blade solid particles of a centrifugal compressor under the action of solid particles of different sizes.The results show that:When the solid particle diameter is within a certain range,there is a linear relationship between the erosion rate of the plastic material and the solid particle diameter.The particles on the pressure surface of the main blade of the particle have the highest degree of wear,and as the particle size increases,the wear rate peaks Tends to increase.The largest wear part will move to the back root part of the pressure surface,which is consistent with the trajectory characteristics of the particles.Compared with the wear of the pressure surface,the suction surface of the blade has no obvious wear.Except for the wear of the front of the blade compared with the pressure surface,there is no obvious wear on the suction surface of the blade.The particles with a larger diameter have the most obvious effect on the erosion and wear of the blade,which means that the larger the diameter,the greater the erosion rate on the blade.（2）Using the Euler-Lagrangian two-phase flow model and the discrete impact model to deal with solid particles with three different mass flows（0.01kg/s,0.03kg/s,0.05kg/s）,the centrifugal compressor gas The solid two-phase flow and the erosion and abrasion of the blade solid particles are simulated.The results show that the solid particles with a mass flow of 0.01,0.03,and 0.05 kg/s mainly affect the erosion and abrasion of the pressure surface of the blade by solid particles.To a certain extent,increasing the mass flow rate will accelerate the blade wear rate.At the same time,the largest wear part will shift to the heel part.The particles with a mass flow rate of 0.05kg/s have the most obvious effect on the blade erosion and wear,which indicates the quality The greater the flow rate,the greater the erosion rate on the blades.