Simulation and Research on Internal Flow Fields of Ball Valve Based on Fluent Software
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摘要: 利用FLUENT软件对球阀内部三维流场进行数值模拟仿真.探究了球阀开度由关闭到逐步增大时阀门的内部流场流动状态.分析了球阀在5个不同开度下(20%、40%、60%、80%和100%),球阀的内部流场变化情况.由此得出当阀门开度为20%~40%之间时,球阀内部流动最为复杂,产生最为强烈的涡流回旋,阀门的流阻很大,漩涡周围边界流速远大于中心流速,并且中心压力最低,直至全开时流动达到稳定.计算得出这5个不同开度下阀门前后压差,流量系数和流阻系数变化值,绘制出其三者在阀芯不同开度时的变化曲线.Abstract: Fluent is used to take numerical simulation of three dimensional flow of the inner of the ball valve. There is an exploration on the internal flow fields of the valve when the opening degree gradually increases. The change circumstances of the internal flow fields of the ball valve is analyzed on 5 different opening degrees(20%,40%,60%,80% and 100%). Simulation results show that: when the valve opening is between 20% ~ 40%,the ball valve internal flow is the most complex,the eddy current cyclotron is the most strong,the valve flow resistance is very large,swirls velocity around the boundary is much larger than the velocity at the centre,and the pressure at the center position is the lowest,until the flow reaches steadily. The differential pressure value before and after the valve,the variation values of the flow coefficient and flow resistance coefficient on 5 different opening degrees have been got,the variation curves about three of them are obtained by analysis when the valve is on different open degrees.
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Key words:
- ball valve /
- boundary conditions /
- computer simulation /
- energy dissipation /
- flow coefficient
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