作者：陈文琳1,2
作者单位：1. 兰州大学 西部灾害与环境重点实验室, 甘肃 兰州 730000;
2. 新疆维吾尔自治区计量测试研究院, 新疆 乌鲁木齐 830011
关键词：涡街流量计;管道条件;安装影响;旋涡脱落频率;流场特性;数值仿真
摘要：
为研究不同管道条件对涡街流量计测量结果及内部流场产生的影响，该文针对2种不同直管段长度时涡街流量计的旋涡脱落频率进行仿真计算与实验测试，结果显示仿真计算与实验测试结果具有较好的一致性，验证数值仿真用于涡街流量计流场分析的可行性。在此基础上，对上下游直管段长度不足、上游有单个90°弯头、下游有单个90°弯头这3种管道条件下共13种不同长度情况对应的涡街流量计的流场特性进行了仿真计算，结果表明，前端直管段长度的减少对测量结果的影响较后直管段更为明显；信号强度与直管段长度没有直接关系；前端有弯头时，频率值大幅降低，最大误差达-60.62%，弯头离旋涡发生体越近，降幅越大；后端有弯头对测量结果影响相对较小，最大误差为-13.23%。
Numerical simulation of flow field characteristics of vortex flowmeter under different installation conditions
CHEN Wenlin1,2
1. Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China;
2. Xinjiang Uygur Autonmous Region Research Institute of Measurement & Testing, Urumqi 830011, China
Abstract: In order to study the influence of different pipeline conditions on the measurement results and internal flow field of vortex flowmeter, the vortex street with two different straight pipe lengths is studied in this paper.The vortex shedding frequency of the flowmeter is simulated and tested. The results show that the simulation results are in good agreement with the experimental results, and the numerical values are verified.Feasibility of simulation for flow field analysis of vortex flowmeter. On this basis, there are insufficient length of straight pipe section upstream and downstream, single 90° elbow upstream and single downstream.The flow field characteristics of the vortex flowmeter corresponding to 13 different lengths in 3 pipe conditions with 90° elbows are simulated and calculated. The results show that the front end of the vortex flowmeter has a good performance. The influence of length reduction of straight pipe section on measurement results is more obvious than that of back straight pipe section; signal intensity has no direct relationship with length of straight pipe section; when there is elbow in front, frequency The maximum error is -60.62%. The closer the elbow was to the vortex generator, the larger the decrease. The downstream elbows had a relatively small influence on the measurement results, and the maximum error is -13.23%.
Keywords: vortex flowmeter;pipeline conditions;installation effects;vortex shedding frequency;fluid field characteristics;numerical simulation
2019, 45(5):110-115,127 收稿日期: 2019-01-30;收到修改稿日期: 2019-03-12
基金项目:
作者简介: 陈文琳(1988-),女,甘肃武威市人,工程师,博士研究生,研究方向为工程流体力学
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