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随着高速电子计算机的出现,叶轮机械三元流动理论在可压缩流体的叶轮机械中得到广泛应用。其效果之显著,促使人们力图推广其应用范围,水力机械行业也不例外。 本文应用两类相对流面理论的基本思想和方法,推导出适合于水力机械设计的三元流动基本方程和计算方法。文中首先依据质量守恒原理及牛顿第二定律,推导出适合水力机械的三元流动理论的基本方程组;其次把基本方程组化为沿S_1和S_2相对流面上流体流动所必须遵循的方程组;最后给出S_1和S_2相对流面上相应的流线曲率法的基本公式和计算方法。
With the advent of high-speed electronic computers, impeller mechanical ternary flow theory is widely used in the compressible fluid impeller. Its effect is remarkable, prompting people to try to promote its scope of application, hydraulic machinery industry is no exception. In this paper, the basic ideas and methods of two types of relative flow theory are applied to derive the basic equations and calculation methods of ternary flow suitable for hydraulic machinery design. Firstly, based on the principle of conservation of mass and Newton’s second law, the basic equations for ternary flow theory of hydraulic machinery are deduced. Secondly, the basic equations are formulated into the equations which must be followed in the flow on the relative flow surfaces of S_1 and S_2 Finally, the basic formula and calculation method of the corresponding streamline curvature method on the relative flow surface of S_1 and S_2 are given.