| With the continuous development of science and technology,gas turbine technology has made great progress and development.Its small size,light weight,fast start and many other advantages have also been discovered by more people.The gas turbines first used in aerospace power equipment are gradually generating developed in the fields of power station,offshore platforms and ship power systems.In order to meet different work needs,gas turbines' structure and performance are constantly being improved according to the needs of its work.However,with the popularity of gas turbines,the environment in which they work has become diverse,and different external environments have had different effects on their operation.As an engine with a large number of continuous gases as circulating fluids,air is the most indispensable working condition for gas turbines.Its importance is equivalent to human breathing.When human breathe polluted air for a long time,his health will also decrease.When a gas turbine is operated for a long time in a harsh environment such as haze,dust,or ocean,its performance will also decrease and its life will be shortened.As the front of the gas turbine,the compressor is the first part of the engine body that comes into contact with the air and is directly related to the air and the particles contained therein.Particulate matter in the air can cause various effects such as wear,corrosion and scale on the blades of the compressor,thereby degrading the performance of the compressor.In this paper,a kind of experimental axial flow compressor is referenced.Based on the numerical simulation technology,a mathematical model of the experimental axial flow compressor is established and CFX is used as the numerical calculation software to simulate and calculate the flow field information inside the compressor.After that,the gas-solid two-phase flow calculation of the compressor was carried out,simulating the influence of the particles in the air on the compressor under the dusty environment,and obtaining the position of the particles on the blade at different rotation speeds,and calculating the blade,The wear rate concentration distribution of the casing and the hub,and finally the wall roughness of the compressor blades under different wear levels is set according to the concentration of the wear rate,and the performance of the compressor under different roughness is calculated and the previous calculation results areperformed.The relationship between the degree of blade wear and the degradation of compressor performance is obtained.The main contents of this paper are as follows:1.Taking a certain type of experimental axial flow compressor as the research object,the characteristic line of the axial compressor at different speeds is calculated by numerical calculation method,and compared with the experimental axial flow compressor of the same size,verifying The rationality of the calculation model and calculation method.2.Based on the results of single-phase calculation,according to the dust concentration and sand diameter under the actual dusty environment,the effect of particles on the blades,casing and hub is obtained by the calculation method of gas-solid two-phase flow.Position,the corresponding wear rate concentration distribution is obtained.3.According to the calculated wear rate concentration,set the roughness of the compressor blade surface,calculate the performance parameters under different roughness,and predict the relationship between the blade wear degree and the axial compressor performance degradation. |
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