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本文所述推导液动力计算公式的方法,是以近年来国内外研究流体动力学常用的所谓“控制体”法为基础的,其推导演算简单,易于得到有关矢量的表达式,这在需要判断矢量方向时,特别方便和准确。本文第一部分用“控制体”法推导出奈维——斯托克斯方程的矢量式,进而推出内流式滑阀轴向液动力计算公式,并介绍了如何应用本文公式判断液动力的方向;第二部分系锥阀推力系数的推导,着重论述了滑阀、锥阀之间的共性,并指出,本质上两者并无区别,计算公式及特性分析也极其类似;第三部分介绍在应用“控限体”法进行液动力分析时,选取控制体的基本原则;此外,作为这些原则的应用实例,作者分析了国内外某些文章中,在选取控制体时所存在的一些混乱和错误之处。
The method of deducing the hydrodynamic formula described in this paper is based on the so-called “control body” method which is commonly used in hydrodynamics research at home and abroad in recent years. Its derivation is simple and easy to get the expressions about the vectors. Vector direction, especially convenient and accurate. In the first part of this paper, we derive the vectorial formula of the Navier-Stokes equations by the “control body” method, and then derive the formula of the axial hydrodynamic force of the internal flow spool and how to apply the formula to determine the direction of the hydrodynamic force ; The second part is the derivation of the thrust coefficient of the cone valve, focusing on the commonalities between the spool valve and the cone valve. It points out that there is no difference between the two, and the calculation formula and characteristic analysis are very similar. The third part introduces In addition, as examples of the application of these principles, the author analyzes some of the confusion that exist in the selection of control bodies in some articles at home and abroad Wrong place.