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Coupling Simulations of Hydraulic Systems with Characteristic Method and CFD

机译：具有特性方法和CFD液压系统耦合模拟

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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，具有CFD（计算流体动力学）的数值模拟已经广泛地应用于分析流体技术中液压元件的内部流程过程。本文的主要目的是调查液压系统耦合仿真，主要由液压管道，压力限制阀，节流阀等组成，包括离线和在线耦合。为此，使用了两种方法：液压系统的简化模拟方法之一，即特征方法和流动仿真方法-CFD。测量孔的内部流动的模拟，特别是压力限制阀中的空化现象的研究，以及该阀的锥体的振荡与CFD代码流畅，所研究的系统的其他部分计算通过立体特征方法通过Matlab / Simulink进行。使用两个个人计算机实现在线耦合模拟，每个TCP / IP完成信号文件的必要传输。离线耦合的仿真结果表示来自流畅的测量孔口的平均流速比Matlab / Simulink的值大8.58％，并且在这些仿真结果之间存在80°的相位差。在线耦合仿真的研究表明，在锥体的运动期间，蒸汽体积分数动态变化。当座椅和压力限制阀的锥之间的间隙等于1.8E-4M时，蒸汽体积分数的值达到65％，而当间隙增加至2.4E-4M时，蒸气体积分数的值减少到0.26。耦合仿真的计算结果证明了应用耦合原理的有效性。

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