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首页> 外文会议>International Conference on Fluid Power Transmission and Control(ICFP' 2005); 20050405-08; Hangzhou(CN) >Coupling Simulations of Hydraulic Systems with Characteristic Method and CFD
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Coupling Simulations of Hydraulic Systems with Characteristic Method and CFD

机译：特征法与CFD耦合的液压系统仿真

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摘要

In recent years, with the development of personal computers of the large-capacity and rapid computation, numerical simulation with CFD (Computational Fluid Dynamics) has been becoming broadly applied to analyze the inside flow processes of the hydraulic components in fluid technology. The main aim of this paper is the investigation of coupling simulation of hydraulic systems, which mainly consist of hydraulic pipelines, pressure limiting valve, throttle, etc., including offline and online coupling. To do so, two methods are used: one of the simplified simulation methods for hydraulic systems, namely, characteristic method, and flow simulation method - CFD. The simulations of the inside flow of a measuring orifice and specially the investigations of cavitation phenomenon in a pressure limiting valve, as well as the oscillation of the cone of this valve are complemented with CFD code FLUENT, the other parts of computation for the studied systems are carried out through Matlab/Simulink by means of one-dimensional characteristic method. The online coupling simulation is realized using two personal computers and the necessary transfer of the signal files is accomplished per TCP/IP. The simulation results of offline coupling represent that the averaged flow velocity at the outlet of the measuring orifice from Fluent is 8.58 % larger than the value from Matlab/Simulink, and there is a phase difference of 80° between these simulation results. The study of online coupling simulation shows that vapor volume fraction changes dynamically during the motion of the cone. When the gap between the seat and the cone of the pressure limiting valve equals 1.8e-4 m, the value of vapor volume fraction reaches 65 %, whereas, when the gap increases to 2.4e-4 m, the value of vapor volume fraction reduces to 0.26. The calculation results of coupling simulation prove sufficiently the validity of the applied coupling principle.
机译：近年来，随着大容量和快速计算的个人计算机的发展，利用CFD（计算流体动力学）的数值模拟已被广泛地应用于分析流体技术中液压部件的内部流动过程。本文的主要目的是研究液压系统的耦合仿真，主要包括液压管道，限压阀，节流阀等，包括离线和在线耦合。为此，使用了两种方法：液压系统的一种简化的仿真方法，即特性方法和流量仿真方法-CFD。测量孔内流量的模拟，特别是限压阀中的气穴现象的研究，以及该阀锥的振动，均由CFD代码FLUENT进行了补充，这是所研究系统的其他计算部分通过Matlab / Simulink通过一维特征方法进行。在线耦合仿真是使用两台个人计算机实现的，并且信号文件的必要传输是根据TCP / IP完成的。离线耦合的仿真结果表明，来自Fluent的测量孔出口处的平均流速比Matlab / Simulink的值大8.58％，并且这些仿真结果之间存在80°的相差。在线耦合模拟的研究表明，蒸气体积分数在圆锥运动期间会动态变化。当阀座和限压阀锥之间的间隙等于1.8e-4 m时，蒸气体积分数的值达到65％，而当间隙增大到2.4e-4 m时，蒸气体积分数的值减少到0.26。耦合仿真的计算结果充分证明了所应用耦合原理的有效性。

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