不同来流条件对涡轮叶片表面颗粒沉积影响的实验研究

Low melting temperature wax droplets were injected to simulate the micro-particle deposition on the turbine vane surface in order to study the deposition characteristics on the turbine vane surface. Experimental simulation was performed for a plate to assess how the deposit formation was influenced by the angle of attack (AOA) and particle concentration, based on observing wax deposition and quantifying mass distribution. The dynamic deposition results were analyzed from an equivalent accelerated test. Results showed deposition occurred mainly on the leading edge and the middle-rear part of pressure surface. Deposition mass was far larger on the leading edge than that on pressure and suction surfaces. The deposition mass on the pressure and suction surfaces increased significantly with AOA increasing, while there was few change in the deposition on the leading edge. Deposition mass became larger on the leading edge and pressure surface with the increase in freestream concentration of particle. Deposition mass on the plate leading edge increased with increasing particle concentration and shortening the test time, based on the law of constant total particle ejection mass.