某型涡轮动叶气动性能的实验研究

Experimental Study of the Aerodynamic Performance of the Rotating Blades of a Turbine

在环形涡轮叶栅低速风洞上,对原型和改型两套动叶栅进行了不同冲角下的吹风实验。应用五孔探针与设置在叶片表面上的静压测孔,分别测量了叶栅出口横截面的气动参数沿节距与叶高的分布以及根、中、顶3个廻转面内静压系数沿叶型的分布。实验结果表明:与原型动叶比较,改型动叶总损失在-10°、-5°、0°、5°和10°5个进气冲角条件下分别降低了6.17%、4.73%、13.53%、19.34%和21.7%,而且具有良好的冲角适应特性。

In a low speed wind tunnel for annulus turbine cascades,an air blowing test was performed of the prototype and two sets of modified rotating cascade at various incidence angles.Five-hole probes and static pressure measuring holes provided on the surface of the blades were used,measuring the distribution of the aerodynamic parameters in a cross section at the outlet of the cascade along the pitch and blade height direction respectively as well as the distribution of the static pressure coefficients on the surface of the blade profile in the rotating surfaces at the blade hub,middle and tip respectively.The test results show that compared with those of the prototype,the total pressure losses of the rotating blades thus modified decrease by 6.17%,4.73%,13.53%,19.34 and 21.7% at five incidence angles respectively and the above-mentioned blades exhibit a good adaptability to various incidence angles.