Numerical Simulation on Flow Field of Nuclear Safety Grade 2 Single-Seat Pneumatic Diaphragm Control Valve
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摘要: 运用计算流体力学(CFD)方法对核2级气动薄膜单座调节阀多开度下的稳态和瞬态流场进行了数值模拟。额定工况下稳态数值模拟结果表明,阀座缩口和阀芯表面涡量很大,导致阀芯头部受到较大的流动冲击,且阀芯锥面压力分布不均匀,可见阀芯为薄弱环节,在设计中应着重考虑。在稳态计算的基础上,对100%和40%开度的流场进行瞬态数值模拟,计算得出流道中涡量最大位置(缩口和阀芯表面)的压力脉动主要频率与阀门结构的前几阶振频存在一定差别,不易引起结构共振。Abstract: The Computational Fluid Dynamics（CFD） method is employed to simulate numerically the steady flow and transient flow under variable openings of the nuclear safety grade 2 single-seat pneumatic diaphragm control valve,which is a sleeve valve.The steady simulations under rated condition tells that there is a large amount of vortex in the valve seat necking and around the valve cone,which leads to a much greater flow impact on the head of the valve cone and uneven pressure distribution on spool face.More consideration should be taken on the characteristics of the valve cone accordingly,when designing a valve of this kind.Then the transient flow under 100% and 40% openings is simulated numerically on the basis of steady simulations.The pulsation of the pressure magnitude at the points with large vorticity,in the valve seat necking and around the valve cone,is monitored.The main pulsation frequencies differ from the low natural frequencies of the model,which means that it is safe from leading to structural resonance.
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Key words:
- Nuclear grade /
- Control valve /
- Numerical simulation of flow field /
- Vibration
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