Experimental and numerical design of a long-waist cone flow meter
Experimental and numerical design of a long-waist cone flow meter
复制标题
长腰锥形流量计的实验与数值设计
DOI：
10.1016/j.sna.2013.04.039
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发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
Dong, Feng
中科院分区：
文献类型：
--
作者：
Tan, Chao;Wu, Hao;Wei, Can;Dong, Feng
长腰锥形流量计是为稳定的压差测量和相对较小的总压降而设计的。在锥元与管壁之间形成等径环形流道。采用三维CFD模拟方法研究了水流通过锥元时的流场。发现定径环形通道可以调节流入流体，锥形元件的小后角可以减小流动分离和总压差。在流场分析研究的基础上，提出了一种优化的长腰锥流量计结构。可以从LWC提取稳定的收缩压差和总压差。在β= 0.65时，制备了一组直径比β为0.55 ~ 0.75，腰长为20 ~ 60 mm的lwc，进行了实验测试和CFD验证。观察并分析了不同雷诺数下lwc的无因次压差Δp*和Δp*的减小趋势和流量系数cd的增大趋势，并对不同牛顿单相流的流量预测进行了实验研究。以油水两相流为例，选取了一种LWC，将其处理为均匀流时，平均误差低于5%。
A long-waist cone flow meter is designed for steady differential pressure measurement and relatively small overall pressure drop. A constant-diameter annular flow channel is formed between cone element and pipe wall. The flow field of water flows through cone element is studied with 3-D CFD simulations. The constant-diameter annular channel is found being able to adjust the incoming fluid, and small rear angle of cone element could reduce flow separation and overall pressure difference. An optimized structure of long-waist cone flow meters, referred as LWC, is proposed based on the investigations on flow field analysis. A steady contracting differential pressure and an overall differential pressure can be tapped from a LWC. A set of LWCs was fabricated with diameter ratioβranging from 0.55 to 0.75, and waist lengthLfrom 20 to 60 mm whenβ= 0.65 for experimental tests and CFD verifications. A decreasing trend of dimensionless differential pressure Δp*andδp*and an increasing trend of discharge coefficientCdof LWCs under different Reynolds number are observed and analyzed, and flow rate prediction of different Newtonian single phase flow is experimentally studied. A case study of oil–water two-phase flow is then presented with a selected LWC and an average error below 5% is achieved when treating the mixture a homogeneous flow.
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