水击泄压阀开启过程阀口流场的数值模拟

FLOW FIELD NUMERICAL SIMULATION OF WATER HAMMER RELIEF VALVE DURING OPENING VALVE PORT

泄压阀作为管道系统的重要安全部件,其作用在于保障管道系统超压安全,减少爆炸性事件的发生。基于雷诺时均方程和标准k-ε紊流模型,运用Fluent动网格和UDF技术对某水击泄压阀管道模型进行数值模拟,通过UDF程序控制阀门开启速度,得到阀口附近流场参数的数值变化。研究表明:水击泄压阀阀芯部分会有明显的节流效应,导致阀内速度的突变;随着管道内压力的增加,管道内部速度总体呈现增大趋势,噪声和速度具有一定的相关性,阀门内部声功率级分布基本呈现对称分布。

Pressure relief valve is an important safety part a pipeline system,which aims at preventing the pipeline system from over pressure and reducing further risk. Based on RANS equations and standard k- ε turbulent model,utilizing dynamic mesh and UDF of Fluent,a water hammer relief valve pipe model numerical simulation was carried out. Through the UDF program controlling the opening speed of valve by UDF program,the numerical variation of flow field parameters near the valve port was collected. Research shows that the core part of water hammer relief valve has a throttling effect,resulting in valve velocity mutation; with the increase of pipeline internal pressure,the pipeline internal velocity overally increases: correlation exists between noise and velocity,and the valve internal sound power level distribution basically shows symmetrical distribution.