Research On Turbine Blade Erosion And Performance Decline Of A Certain Type Of Aeroengine

Aeroengine HPT(high-pressure turbine)blades are vulnerable to corrosion damage caused by airport runway residues,airborne particles,etc.during takeoff.HPT blade erosion damage seriously affects blade strength,engine performance and normal operation of the engine,even causing disastrous consequences.In order to clarify the eroded area and erosion degree of high pressure turbine blade by the particle size and particle concentration,the research combined with the foreign and domestic material erosion test,semi-physical experiment and simulation results,with advanced numerical simulation technology and system research methods,The particle concentration of DPM(Discrete Phase Model)numerical simulation to systematically sum up the trajectories of erosion particles,erosion area and erosion quality rules.The research contents and the results obtained are in the following four aspects:1?The average wind speed of the airport is above 7m/s,which provides wind speed conditions for the suspension of particles with particle diameter D?500?m.The engine lip provides low-pressure zone with large diameter(D?500?m)particles to enter the engine.2?Prediction and tracking of particle trajectories using Lagrange method in numerical simulation show that particles with particle size(10~80?m)tend to follow the airflow and cause slight wear on the blades.Large diameter(D?100?m)particle trajectories significantly deviate from the airflow path,part of the particles rebound after impact on the blade and the blade and the casing caused several serious damage.3?The particles are subject to different degrees of centrifugal force,causing the particles to deflect upward after entering the rotor channel,accumulating on the trailing edge of the blade and striking the casing surface,which cause severe wear to the turbine rotor blade and the casing.After the simulation of turbine blades with a series of particle concentrations(80mg/m~3~700mg/m~3),it was found that there was a certain linear relationship between the wear quality and the particle concentration.The average wear rate was Eq=2.6mg/g.4?Particle erosion has no effect on the efficiency of the turbine under the condition of take-off of the aircraft.However,when the blade back becomes flat due to abrasion,the blade becomes thinner,the chord of the blade decreases,the performance declines and the like,Work safety and service life greatly reduced,a serious threat to the reliability of the engine and aircraft safety.Particle erosion of high pressure turbine blades seriously affects engine performance and service life.Studying the regular patterns of particle erosion would guide the design,development and application of thermal barrier coatings on turbine blades,the lows provide data reference for gas turbine maintenance engineers to make maintenance plans.