喷嘴流量计的流场数值模拟与取压位置优化

Flow Field Numerical Simulation and Pressure Tapping Location Optimization of Nozzle Flow Meter

为了寻找合适的取压位置,通过fluent软件对不同工况条件的喷嘴流量计进行数值模拟。结果表明:流场中靠近喷嘴的压力和速度有明显的波动,在越靠近喷嘴的一定范围内,压力和速度变化的幅度越大。根据模拟结果分析,高压取压口应取在距离喷嘴入口端面不低于1.6D处,低压取压口轴线应选择在距离喷嘴出口断面逆着流体流动方向不小于0.09D处。该研究对喷嘴流量计的取压位置优化和改善喷嘴流量计测量性能具有一定的意义。

Flow field structure in the nozzle flow meter was simulated by fluent software to optimize pressure tapping location. By simulating the flow field structure inside the nozzle flow meter, pressure and velocity inside the pipe were mainly analyzed. The results showed that, in the flow field, the pressure near the inner surface of the nozzle fluctuated obviously. The closer to the nozzle position, the greater the magnitude of pressure and velocity change. And with the working conditions changing, the pressure field and velocity field changed accordingly. Based on the simulated results, the high-pressure pressure-tapping location should be taken at a distance of not less than 1.6 D from the nozzle inlet end; the axis of the low-pressure pressure-tapping location should be selected at a distance of not less than 0.09 D from the nozzle outlet section against the fluid flow direction. The study is significant for the structure optimization of nozzle flowmeter and improving the measurement performance of nozzle flow meter.