三通调节阀分流比及内部流动特性分析
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摘要
为探究三通流量调节阀的分流比及内部流动特性,应用标准k-ε湍流模型,采用SIMPLE算法,对其内部流场进行三维流道数值模拟.通过改变进口流量及阀芯旋转角度等条件,研究三通调节阀内部流动特性及分流比的变化规律,模拟和试验结果能够很好地吻合.研究结果表明:阀芯旋转角度介于15°～75°时三通流量调节阀能有效分流;随着调节阀角度的增大,水平分流比先增大,在35°左右增大到0.55附近,之后开始减小,在55°左右减小到0.40附近,最后持续增大到1.00,这种变化趋势与水平出流面积占总出流面积的比率变化相同;进口压力随着调节阀角度的增大先增大后减小,在45°左右达到峰值,压力曲线以45°为对称线呈对称形状,这种变化趋势与阀门调节部分入口过流面积的变化相符;在阀门进口段与阀芯的连接部分过流面积收缩节流,导致该处流速最高、阀门进口管部分压力最高.
To investigate the diffluence ratio and internal flow characteristics of a three-way control valve,the SIMPLE algorithm was used to simulate the internal flow field by using the standard k-ε turbulence model. By changing the inlet flow rate and the rotational angle of valve core,the internal flow characteristics and the diffluence ratio variation laws were studied. The simulated and experimental results were in good agreement each other. The results show that the valve can shunt effectively when the rotational angle varies from 15° to 75°. With increasing angle,the horizontal diffluence ratio increases at first to 0.55 at 35°,then decreases to 0.40 at 55°,finally keeps increasing to 1.00. This variation tendency agrees with the change in the ratio of the horizontal outflow area to the total outflow area. With increasing angle,the inlet pressure increases firstly and then decreases but reaches the peak at about45°,the pressure curves are generally symmetrical about 45° line. This change tendency is consistent with the entrance flow area of the regulating part. The flow area contracts in the connection part between the inlet and the core,and the throttling leads to the highest flow velocity in that place and the highest pressure at the entrance.
To investigate the diffluence ratio and internal flow characteristics of a three-way control valve,the SIMPLE algorithm was used to simulate the internal flow field by using the standard k-ε turbulence model. By changing the inlet flow rate and the rotational angle of valve core,the internal flow characteristics and the diffluence ratio variation laws were studied. The simulated and experimental results were in good agreement each other. The results show that the valve can shunt effectively when the rotational angle varies from 15° to 75°. With increasing angle,the horizontal diffluence ratio increases at first to 0.55 at 35°,then decreases to 0.40 at 55°,finally keeps increasing to 1.00. This variation tendency agrees with the change in the ratio of the horizontal outflow area to the total outflow area. With increasing angle,the inlet pressure increases firstly and then decreases but reaches the peak at about45°,the pressure curves are generally symmetrical about 45° line. This change tendency is consistent with the entrance flow area of the regulating part. The flow area contracts in the connection part between the inlet and the core,and the throttling leads to the highest flow velocity in that place and the highest pressure at the entrance.
引文
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[2]贺杰,李文华,李怀义,等.锥形节流阀中背压对空化流场的影响[J].流体机械,2018,46(2):41-45.HE Jie,LI Wenhua,LI Huaiyi,et al. Effect of back pressure on cavitation flow inside throttle valve[J]. Fluid machinery,2018,46(2):41-45.(in Chinese)
[3] MANAGEMENT E P. Control Valve Handbook[M].[S.l.]:Fisher Controls International LLC,2005.
[4] MOUJAES S F,JAGAN R. 3D CFD predictions and experimental comparisons of pressure drop in a ball valve at different partial openings in turbulent flow[J]. Journal of energy engineering,2008,134(1):24-28.
[5]姚晓春.V形调节球阀的数值模拟及结构优化[D].兰州:兰州理工大学,2009.
[6]张生昌,张玉林,方志明,等.基于CFD的球阀三维流场数值模拟[J].排灌机械工程学报,2013,31(2):157-161.ZHANG Shengchang,ZHANG Yulin,FANG Zhiming,et al. 3D flow numerical simulation of ball valve based on CFD[J]. Journal of drainage and irrigation machinery engineering,2013,31(2):157-161.(in Chinese)
[7]王虎斌.基于遗传算法的三通调节球阀节流盘型线优化研究[D].兰州:兰州理工大学,2016.
[8]成雷.三通除焦阀的结构设计及流体计算[J].石油化工设备技术,2011,32(6):27-29.CHENG Lei.Structure design and hydraulic calculation of hydraulic decoking three-way valve[J]. Petro-chemical equipment technology,2011,32(6):27-29.(in Chinese)
[9]章茂森,李忠,靳淑军,等.某冷却系统用三通调节阀内部湍流动能和耗散率分析[J].流体机械,2019,47(3):37-41.ZHANG Maosen,LI Zhong,JIN Shujun,et al. Analysis of internal turbulent kinetic energy and dissipation rate in three-way regulating valve for a cooling system[J].Fluid machinery,2019,47(3):37-41.(in Chinese)
[10]季雷雷,何世权.桁架过流式三偏心蝶阀的动水力矩计算与优化[J].流体机械,2018,46(10):47-51.JI Leilei,HE Shiquan. Calculation and optimization of hydrodynamic moment of truss over tri-eccentric butterfly valve[J]. Fluid machinery,2018,46(10):47-51.(in Chinese)
[11]朱钰.具有圆形阀口的三通滑阀的静态特性分析[J].集美大学学报(自然科学版),2008(4):33-36.ZHU Yu. Steady-state flow characteristics analysis of three-way spool valve with circular port[J]. Journal of Jimei University(natural science),2008(4):33-36.(in Chinese)