作者：牛志娟, 赵奇, 杨雪峰

作者单位：四川大学化学工程学院, 四川 成都 610065

关键词：环槽流量计;压力损失;流出系数;数值模拟;测试

摘要：

研究流量计内部流场和结构优化,对改善流量计的测量性能和提高测量精度,具有重要的现实意义。将计算流体力学(CFD)仿真试验应用于一种新型差压流量计环槽流量计,考查不同等效直径比、前端和尾部长度、等直径段长度以及雷诺数对环槽流量计的流出系数和压力损失的影响。结果表明:随着雷诺数的增加,流出系数逐渐增大并达到稳定值;随着增大,流出系数先增大后减小;前端及尾部长度对流出系数影响不大,但尾部长度越大,永久压损越小;等直径段长度越小,永久压损越小。根据结果拟合出环槽流量计流出系数的公式,CFD数值模拟作为一种辅助设计和标定手段,有助于指导环槽流量计的现场测试。

Numerical simulation and optimization of ring groove flow meter

NIU Zhijuan, ZHAO Qi, YANG Xuefeng

College of Chemical Engineering, Sichuan University, Chengdu 610065, China

Abstract: Studies on the internal flow field and structural optimization of flow meters is important for improving the measurement precision of flow meters. The simulation test of computational fluid dynamics (CFD) was carried out on a new type of differential pressure flow meter or ring groove flow meter. The study is to explore how some key factors have influenced the discharge coefficient and pressure loss of the meter. These key factors include equivalent diameter ratio, fore-and-aft length, equal diameter length and Reynolds number. The experimental results show that the discharge coefficient increases gradually and then reaches a steady value while the Reynolds number keeps increasing. When the equivalent diameter ratio is increasing, the discharge coefficient increases as well at first and then decreases. The fore-and-aft length has little effect on the discharge coefficient. The permanent pressure loss declines as the tail becomes longer and the equal diameter section is shortened. An equation for discharge coefficient was fitted out according to the results above. As a complementary design and certification tool for flow meter, the CFD numerical simulation can help guide the field testing of ring groove flow meters.

Keywords: ring groove flow meter;pressure loss;discharge coefficient;numerical simulation;measurement

2016, 42(2): 122-126  收稿日期: 2015-5-25;收到修改稿日期: 2015-7-30

基金项目: 

作者简介: 牛志娟(1990-),女,河南安阳市人,硕士研究生,专业方向为传质与分离。

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