开槽尾流板对跨声速涡轮平面叶栅流场影响的实验

采用数值计算和实验相结合的方式研究了开槽尾流板对跨声速涡轮平面叶栅流场周期性的影响。通过数值计算研究了不同开孔率（10%、15%、30%、50%）和偏转角度（70°、71°、72°）下尾流板对叶片表面及叶栅流道出口压力分布的影响，并通过实验验证了尾流板对流道出口流场周期性的改善作用。结果表明:无尾流板时叶片表面压力分布明显偏离周期性计算结果，且流道出口压力分布的周期性误差较大；尾流板偏转角度和开孔率会影响叶片表面及叶栅流道出口的压力分布，适当调节尾流板参数能改善流场周期性；安装开孔率为50%，偏转角度为70°的尾流板时各流道出口的压力分布一致性最好且最接近周期性计算结果，计算和实验结果的周期性误差较无尾流板时分别降低47.6%和28.1%。 

Experiment on effects of slotted tailboard on flow field of transonic turbine linear cascade

Numerical and experimental investigations were performed to study the effect of the slotted tailboard on the periodicity of transonic gas turbine cascade. Computational fluid dynamics was employed to study the effect of tailboards for pressure distributions of the blades and cascade passage exits with different void ratios (10%, 15%, 30%, 50%) and pitch angles (70°, 71°, 72°), meanwhile experiment was performed to verify that the tailboard improved the periodicity of cascade passage exit flow field. Results showed that, without tailboard, pressure distributions of the blades deviated from the periodic result apparently and the periodicity error of the cascade passage exits was quite large. Pressure distributions were affected by tailboards with different void ratios and pitch angles, besides, the periodicity of the flow field can be improved with a tailboard of appropriate parameters. Pressure distributions of cascade passage exits were much closer to each other and the periodic result with void ratio of 50% and pitch angle of 70° tailboard when compared with no tailboard condition, while the periodicity errors of numerical and experimental results were reduced by 47.6% and 28.1%, respectively.