正反接方式下角座阀内介质的流动特性分析

针对不同连接方式下角座阀内介质的流动特性开展数值模拟和实验研究。采用RNG k-ε湍流模型, 结合标准壁面函数法, 计算阀内流场。通过流量系数的实验数据和计算结果对比, 验证了数学模型和计算方法的准确性。在此基础上, 对正接和反接方式下角座阀内的流动核心区域、速度场和压力场进行对比分析。结果表明:正接方式下, 角座阀具较高的流通能力, 阀芯附近流动核心区域的面积更大, 并且在阀门出口下侧存在较大的漩涡, 会导致流阻增加。两种连接方式下, 阀芯中央截面处均出现二次流, 其中正接方式具有更高的流动不稳定性。

Analysis on the Flow Behavior in the Angle-seat Valve Under Positive or Inversed Connection Modes

The numerical and experimental research on the flow behavior in the angle-seat valve with different connection modes is conducted. The RNG k-ε turbulence model and the standard wall function are used to calculate the internal flow filed. By comparing the flow coefficients obtained from the experiments and numerical calculation, the accuracy of the mathematical model and calculation method is verified. The results showed that: the angle-seat valve has better flowing performance and the larger area of flowing core region under the positive connection. Moreover, there is a big swirl at the underside of valve exit, which will lead to the increase of flow resistance. The secondary flow both occurs on the cross section of valve spool under both connection modes. The positive connection mode has higher flow instability.