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首页> 外文期刊>International Journal of Fluid Power >AN ANALYTIC THERMODYNAMIC MODEL FOR HYDRAULIC RESISTANCES BASED ON CFD FLOW PARAMETERS
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AN ANALYTIC THERMODYNAMIC MODEL FOR HYDRAULIC RESISTANCES BASED ON CFD FLOW PARAMETERS

机译：基于CFD流动参数的水力阻力解析热力学模型

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This article illustrates the development of an analytic lumped parameter thermo-hydraulic model for a wide range of hydraulic resistance geometries based on mass flow. The relevant flow parameters such as the contraction coefficient in case of laminar flow separation are derived from CFD simulations. Furthermore, the consideration of cavitation effects can be included. State of the art in lumped parameter simulations of hydraulic circuits utilise volume-flow based equations like the orifice equation, which is extended for a wide variety of geometries and flow conditions including the transition from laminar to turbulent flow by adjusting the discharge coefficient based on empirical equations or lookup tables. The same situation persists for laminar flow description. In this case the Hagen-Poiseuille equation is often used in conjunction with correction factors based on the Reynolds number to regard the transition of laminar to turbulent flow. However, in practical applications the use of different equations for various flow conditions and geometries is cumbersome. Furthermore, in the widely used volume based flow description, the absolute pressure dependency of mass flow due to density changes and critical flow at which cavitation occurs is not accounted for until now. Without consideration of these influences a mass conservative modelling and thus high model precision is not possible. The overall goal of the proposed model is to increase accuracy of hydraulic system simulation tools and to support usability by simplifying parameterisation on basis of dimensions available from data sheets. The results of this study are obtained analytically as well as empirically by means of CFD simulations. Moreover, a large number of performed simulations support the understanding of fundamental effects in hydraulic resistance flow.
机译：本文说明了基于质量流量的各种液压阻力几何形状的解析集总参数热工水力模型的开发。相关的流量参数，例如层流分离情况下的收缩系数，均来自CFD模拟。此外，可以包括对空化作用的考虑。液压回路集总参数仿真的最新技术利用基于体积流量的方程，如节流孔方程，该方程可扩展到各种几何形状和流动条件，包括通过基于经验调整排放系数，从层流过渡到湍流方程或查询表。对于层流描述仍然存在相同的情况。在这种情况下，通常将Hagen-Poiseuille方程与基于雷诺数的修正因子结合使用，以考虑层流向湍流的过渡。然而，在实际应用中，对于各种流动条件和几何形状使用不同的方程是麻烦的。此外，在广泛使用的基于体积的流量描述中，到目前为止，尚未考虑由于密度变化和发生气蚀的临界流量引起的质量流量的绝对压力依赖性。如果不考虑这些影响，则无法进行质量保守建模，因此无法实现较高的模型精度。提出的模型的总体目标是提高液压系统仿真工具的准确性，并通过简化数据表中可用尺寸的参数化来支持可用性。这项研究的结果是通过CFD模拟获得的分析性和经验性的。此外，进行的大量模拟都有助于理解水力阻力流的基本影响。

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