Study On High Speed Erosion Test Method And Damage Law Of TC4 Plate Subjected To Sand And Dust

In the course of military helicopter flying in desert environment,the air suction engine containing sand and dust will collide with compressor rotor blade at a relatively high speed,resulting in sand and dust erosion,which seriously affects the flight safety of aircraft.Therefore,it is of great significance to carry out the test and simulation analysis of TC4 material eroded continuously by sand and dust at high speed in order to prevent flight accidents caused by erosion damage.In this paper,dust erosion of compressor blade materials is studied.The main research contents and conclusions include the following four aspects:(1)Design and build the high-speed continuous erosion test system.The key components of highspeed sand blasting gun and precise continuous sand feeding device based on Laval tube are designed.The air source system,clamping device of test pieces,shooting system and sand draining device of high-speed continuous erosion test system are selected and constructed.(2)The performance calibration and function test of the high-speed continuous erosion test system are carried out.The results show that the continuous sand feeding system meets the requirements of precise and adjustable sand feeding;the average erosion velocity of sand and dust can reach 323 m/s under the maximum input pressure,which meets the requirements of the TC4 plate under the continuous erosion test of high-speed sand and dust;the input pressure is consistent with the total pressure of the main airflow pipeline,and the sealing performance of the test system is good;the working life of the high-speed sand blasting gun is about 15 hours;(3)Continuous erosion test of TC4 plate was carried out.The results show that with the increase of erosion angle,the mass erosion rate increases first and then decreases,and the peak value appears at about 45 degrees.The erosion rate increases exponentially with the increase of erosion speed,With the increase of erosion time,the erosion rate approaches an exponential growth.(4)The erosion simulation research of TC4 pattern was carried out and compared with the erosion test results.The results showed that the damage morphology caused by different erosion angles was different.At 30 degrees,the sand-dust erosion was mainly caused by cutting,and at 45 degrees,the erosion rate was the highest due to cutting and extrusion.The angle continued to increase,but the cutting effect was weakened,the extrusion effect was enhanced,and plastic hardening occurred.The rule is that at 90 degrees,the sand and dust erosion is mainly extrusion,and the erosion rate is the lowest.In this paper,through the design of high-speed continuous erosion test system,experimental and simulation studies are carried out to reveal the law of erosion damage of TC4 material by sand and dust,in order to further enhance the understanding of blade material removal process,and lay a theoretical foundation for subsequent anti-erosion technology research.