阀笼式调节阀套筒窗口形状设计与流量特性分析
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摘要
我国的阀笼式调节阀技术起步晚,传统的设计过程常常依赖经验公式,产品的实验结果与设计要求存在较大误差。因此,以阀笼式调节阀套筒为设计对象,基于阀笼式调节阀的孔板流量计原理,推导得到套筒横截面积的通用公式和4种流量特性(直线型流量特性、等百分比型流量特性、抛物线型流量特性和快开型流量特性)不同开度下套筒的横截面积,建立模型并用FLUENT软件进行仿真模拟,将调节阀在不同开度下相对流量的实验值与理想设计值进行对比。结果表明:此设计方法在调节阀开度为30%～80%时具有可靠性,不仅有效满足设计要求,而且该方法设计周期短、成本低、精度高。此外,通过推导的阀笼式调节阀套筒的通用面积公式,可改变套筒进口处和出口处的压力值和不同固有流量特性要求,得到符合特定要求的套筒,故具有一定的工程应用价值。
Caged regulating valve technology development is started late in our country. The traditional design process often depends on empirical formula. There is a great error between the experimental results and the design requirements of the product. Therefore, taking the sleeve of caged regulating valve as the design object, based on the theorem of orifice-plate flowmeter, general formulae for the cross section of sleeve and cross section area under different opening of sleeve of four kinds of flow characteristics(linear flow characteristics, equal percentage flow characteristics, parabolic flow characteristics and fast open flow characteristics) were obtained. The model was built and simulation was made with FLUENT software. The experimental values of the relative flow of the regulating valve under different open degrees were compared with the design values. The simulation results show that the design method is reliable when the control valve opening is 30%～80%, which not only meets the design requirements effectively, but also has short design cycle, low cost and high accuracy. In addition, through the general area formula of the caged regulating valve's sleeve, sleeve with specific requirement can be gotten through change the pressure value of the inlet and outlet of the sleeve and different inherent flow characteristics, so it has certain engineering application value.
Caged regulating valve technology development is started late in our country. The traditional design process often depends on empirical formula. There is a great error between the experimental results and the design requirements of the product. Therefore, taking the sleeve of caged regulating valve as the design object, based on the theorem of orifice-plate flowmeter, general formulae for the cross section of sleeve and cross section area under different opening of sleeve of four kinds of flow characteristics(linear flow characteristics, equal percentage flow characteristics, parabolic flow characteristics and fast open flow characteristics) were obtained. The model was built and simulation was made with FLUENT software. The experimental values of the relative flow of the regulating valve under different open degrees were compared with the design values. The simulation results show that the design method is reliable when the control valve opening is 30%～80%, which not only meets the design requirements effectively, but also has short design cycle, low cost and high accuracy. In addition, through the general area formula of the caged regulating valve's sleeve, sleeve with specific requirement can be gotten through change the pressure value of the inlet and outlet of the sleeve and different inherent flow characteristics, so it has certain engineering application value.
引文
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[3] 张婧芳.黑水调节阀流量及流场特性仿真研究[D].兰州:兰州理工大学,2016.
[4] LEE J H,PARK H I,ANN K J,et al.Dynamic Characteristic Analysis of High Pressure Natural Gas Regulating Valve with Computational Fluid Dynamic Analysis[C]//Proceedings of Green and Smart Technology,2015:395-399.
[5] YANG J,YUAN S,YUAN J,et al.Numerical and Experimental Study on Flow-induced Noise at Blade-passing Frequency in Centrifugal Pumps[J].Chinese Journal of Mechanical Engineering,2014,27(3):606-614.
[6] 杨国来,曹文斌,刘小雄,等.调节阀阀口设计与仿真分析[J]. 机床与液压, 2013, 41(13):78-80.YANG G L,CAO W B,LIU X X,et al.Design and Simulation Analysis for Control Valve Port[J].Machine Tool & Hydraulics,2013,41(13):78-80.
[7] WIELAND R,REICHE M,FUNK R,et al.A Computational Fluid Dynamics Model for Wind Simulation:Model Implementation and Experimental Validation[J].Journal of Zhejiang University Science A:Applied Physics & Engineering,2012,13(4):274-283.
[8] 姚世卫,柳勇,聂松林,等.多级笼式套筒减压阀的设计及阀口流量特性研究[C]//全国流体传动与控制学术会议论文集,2014.