【作者】 郑淑娟；

【导师】 权龙；

【作者基本信息】 太原理工大学 ， 机械电子工程， 2005， 硕士

【摘要】 液压锥阀是流体传动与控制技术中重要的基础元件,锥阀内的流场特性直接影响阀的性能,特别是锥阀阀芯在运动过程中的流动特性对阀的工作性能有很大的影响。 按照实际使用中的插装型锥阀的参数,应用CAD软件建立了锥阀的三维几何模型,运用Fluent前处理软件Gambit进行了网格的划分。在阀芯固定不动和阀芯运动过程两种状态下,对流体在锥阀内的流动状态进行了仿真研究。 在进行锥阀阀芯处于固定开口状态的仿真时,分别对锥阀在不同开口度时设定不同的边界条件,对其流场进行仿真研究。阀芯运动状态的瞬态仿真采用动网格技术,利用UDF功能,定义了阀芯在开启和闭合两种情况下的不同速度,对阀芯在运动过程中阀腔内部的流场进行了仿真和研究。在对锥阀内部流场的仿真过程中,使用了自适应网格技术,即在计算过程中,根据压力梯度进行了网格的局部细化,有助于提高解的精度。文中进一步比较分析了阀芯运动和静止时受到的总作用力,对阀更多还原

【Abstract】 The hydraulic poppet valve is one of the most important component in the hydraulic transmission and control, whose characteristics of the inner flow field directly influents the valve’s performance, especially the moving valve cone.The 3-D geometric model of the poppet valve is established by utilizing the CAD software, according to the parameter of the in-service cartridge poppet valve. The mesh of the model is generated by Gambit which is the preprocessor of the Fluent. Both the static valve cone and the moving valve cone, the hydraulic oil flow inside the poppet valve is simulated.When the poppet cone is static, the flow field inside the poppet valve is simulated at the different opening positions and the different boundary conditions. When the poppet cone is moving, the hydraulic oil flow is simulated by setting the dynamic mesh. Through the user defined function, the velocity of the poppet coneis defined. In the procedure of the simulation, the adapt mesh is adopted, which the gradient of the pressure is designed to the adapt function. The adapt mesh is helpful to improving the precision. Furthermore, the cone’s force is calculated and simulated.When the velocity of the fluid flow is changing, the flow force is generated. When the valve’s cone is static, the flow force is named as the static flow force. For the moving cone, it is named as the transient flow force. The flow force affects not only the valve performance but also the hydraulic system, so it is the important factor for designing and analyzing the control valve.In the paper, the static and transient flow force is calculated by the theoretical formula and the simulation. When the opening position is smaller and the discharge is larger, the absolute value of the transient flow force is larger. So when designing the poppet valve, the consideration for the transient flow force is necessary. The study for the valve has offered the significant reference to designing the valve and optimizing the performance.更多还原