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在气液两相流试验装置上,对汽轮机空心静叶表面水膜缝隙抽吸进行了试验研究,并结合两相流动数值方法对水滴沉积的径向分布进行了探讨.试验条件为:叶栅进口空气湿度为7%,水滴直径分布在1.5~201μm之间,抽吸缝隙宽度为1 mm,缝隙角度为45°.研究结果表明:吸力面上的抽吸缝在相对弧长约为0.5处具有最大的抽水效率,而压力面的抽吸缝隙越靠近尾缘处抽水效率越高,且压力面的缝隙抽水性能比吸力面的好,增加气流速度会引起抽水效率降低,增大缝隙抽吸压差可以提高抽水效率.另外,抽水效率沿着叶高方向是增加的.
In the gas-liquid two-phase flow test device, the water film gap suction on the surface of the turbine hollow stator blade was studied and the radial distribution of water droplet deposition was discussed in combination with two-phase flow numerical method.The test conditions were as follows: The inlet air humidity is 7%, the droplet diameter is distributed between 1.5 ~ 201μm, the suction slit width is 1 mm and the slit angle is 45. The results show that the suction slit on the suction surface has a relative arc length of about 0.5 Has the maximum pumping efficiency, while the pressure surface of the suction gap closer to the trailing edge of the pumping efficiency is higher, and the pressure surface of the gap pumping performance than the suction surface, increasing the gas flow rate will lead to pumping efficiency is reduced, increasing the gap suction Pressure differential can increase pumping efficiency.In addition, pumping efficiency is increased along the leaf height.