叶片冲蚀热态试验风洞系统研制

A Research on Hot Experiment Wind Tunnel System for Blade Erosion

本风洞系统采用电加热、全冲角、可调风速、可变固相浓度(稀相范畴)的引风开式热态试验风洞系统,集成计算机通讯、实现试验数据实时采集、实时控制。系统可在高温、多粒径、不同含尘浓度、不同冲蚀速度等拟实际工况下对叶片材质抗冲蚀能力进行研究,并可为SEM研究分析制备试件,从机理上分析叶片材质抗冲蚀特性。通过在若干工况下的热态冲蚀试验,揭示了不同叶片材质受到粒子冲蚀后的一些特性以及金属表面强化工艺对抗冲蚀的效果,与试验材料本身的理论冲蚀特性相符。

Research on the particle-laden gas turbine blade erosion resistance is divided into numerical simulation study and experimental research. There are some obvious defects existing on the accuracy of numerical simulation study,but,by the experimental wind tunnel,hot gas-solid erosion experiment is the most effective and direct means to verify the blade material ability of anti-erosion. The wind tunnel system is a draw-wind open hot experiment system,with electric heating system, adjustable angle of attack and velocity of the wind, and adjustable solid concentration（ Dilute concentrations）. Also,the system uses computer communication to achieve real-time experiment data acquisition,realtime control. The system can carry on research into the anti-erosion ability of different blade materials at the proposed working condition under high temperature,multi-particle size,different concentrations of dust and gas velocity,and the research can also prepare for test pieces for SEM to analyze the feature of erosion from the mechanism. After several different working condition erosion experiments,the experiments reveal some characteristics of different blade materials and the effect of metal surface hardening on anti-erosion, and they are consistent with the material theoretical performance itself.