Analysis of flow characteristics and flow measurement accuracy of elbow under different conditions

3rd International Conference on Energy Equipment Science and Engineering

Zhang, Songsong^1 ; Su, Baohuan^2 ; Liu, Jianmin^3 ; Liu, Xuemin^1 ; Qi, Guoli^1 ; Ge, Yajun^4

China Special Equipment Inspection and Research Institute, Beijing

100029, China^1

Electrical Integration System Product Department, Vision Energy (Jiangsu) Co., Ltd, Shanghai Branch, Shanghai

200051, China^2

Datong Special Equipment Supervision and Inspection Institute, Datong

030004, China^3

School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin

150080, China^4

关键词: Experimental research;    Flow charac-teristics;    Measurement accuracy;    Measurement conditions;    Physical model;    Relative errors;    Testing parameters;    Ultrasonic flow measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012070/pdf
DOI  :  10.1088/1755-1315/128/1/012070

来源: IOP

【 摘 要 】

In modern industry, flow rate is one of the three testing parameters, for pipes with elbows, the fluid in the measuring section can not reach the ideal flow state after the elbow. Therefore, there is a great error in the measurement of flow. The principle of ultrasonic flow measurement based on V method is introduced in this paper, the combination of experimental research and numerical simulation is adopted, the physical model of 90 degree bend pipe with the diameter of 219mm is established, and based on the finite volume method, with the condition of 75t/h, 98t/h and 136t/h. The flow measurement error at different measuring positions after the bend is studied by numerical simulation. The results show that the elbow with diameter of 219mm is under the above three working conditions, the relative error curve of flow measurement tends to be stable and the accuracy is less than 2% after the distance from 10D to the elbow. When other measurement conditions remain unchanged, the greater the flow of the working fluid in the tube, the higher the accuracy of the flow measurement will be at the same measuring position.