摘要
阀门作为管道系统的基本控制设备在管路中起着十分重要的作用,其主要功能是调节流量.阀门阻力系数是阀门的主要参数之一,通常由试验测得,给出推荐使用值.本文以标准k-ε模型为依据,对设在管道中的蝶阀进行了流场数值模拟,研究了在不同开度下的蝶阀阻力系数.通过与设计手册推荐采用的阻力系数进行对比,数值模拟发现流速对阻力系数也有一定的影响,并随着流速的增加其计算值逐渐趋近推荐的阻力系数值.分析计算结果,总结了阻力系数与蝶阀开度及速度的函数关系式ζ=A v2-Bv+C,公式计算与数值模拟值进行比较,满足精度要求.
Valve plays a very important role in the pipeline,as the basic control devices in the piping system;its main function is to regulate traffic.Valve resistance coefficient is one of the main parameters of the valve which is usually measured by the tests and there is no corresponding numerical calculation.The numerical model is based on the standard k-ε model;the numerical simulation and analysis are made based on the different openings of the valve.Considering the impact of velocity on the resistance coefficient,the calculated results are well fitted with experimental results with the increase of the velocity.On this basis,we can conclude the function of resistance coefficient and velocity ζ =A v2 ？ Bv ＋ C.The precision of the calculated is satisfied to the flow field calculations.
出处
《西南民族大学学报（自然科学版）》
CAS
2010年第5期827-831,共5页
Journal of Southwest Minzu University(Natural Science Edition)
关键词
蝶阀
开度
阻力系数
数值模拟
流速
valve
relative opening
resistance coefficient
numerical simulation
velocity
