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在水洞中,对透平叶片冷却膜附壁的稳定性进行了显示观察和测量的实验研究。用圆柱和放大的叶片做模型,模拟叶片前缘和叶盆凹面的流动。在流体动力学相似条件下,用色液显示的方法,观察了圆柱上展向喷射角β为30°的冷漠的流动图案;测量了从圆周角θ为10°、20°、25°和40°处喷射的冷膜的临界速比m_(cr)与主流加速度参数K的关系,并得出经验公式;m_(cr)=f(K、β)。测量的叶片凹面上冷膜的m_(cr)与K的关系,有与圆柱凸面上的相近趋势,可作为工程设计的参考依据。
In the water hole, the experimental study of the observation and measurement of the stability of the adherent wall of the turbine blade cooling film was carried out. Cylindrical and enlarged leaves are used as models to simulate the flow of the leading edge of the blade and the concave surface of the pot. Under similar conditions of hydrodynamics, the indifferent flow pattern with the spray angle β of 30 ° on the cylinder was observed by the method of color liquid display. The curves of the flow angles θ from 10 °, 20 °, 25 ° and 40 ° The relationship between the critical speed ratio m_ (cr) and the mainstream acceleration parameter K of the sprayed cold film is obtained, and the empirical formula is obtained. M_cr = f (K, β). The relationship between m_ (cr) and K of the cold film on the concave surface of the blade is similar to that on the convex surface of the cylinder and can be used as reference for engineering design.