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CFD对S型皮托管流量测量的仿真研究

312    2020-09-17

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作者:王鹏1,2, 穆军1, 雷镇嘉1

作者单位:1. 新疆维吾尔自治区计量测试研究院,新疆 乌鲁木齐 830011;
2. 石河子大学机械电气工程学院,新疆 石河子 832000


关键词:CFD;S型皮托管;直管段;锥形管;压差


摘要:

针对皮托管测量管道气体的排放量存在局限性,该文基于CFD对S型皮托管分别在不同偏移距离、不同锥角管段条件下进行单因素仿真实验,首先建立压差ΔP的目标函数,得出S型皮托管的校准系数0.85,进一步研究不同流场条件对压差、相对示值误差的影响。研究结果表明:直管段条件下,随着空气流速的增大,压差呈现一致的变化规律;在同一流速下,偏移距离越大,压差就越大,示值误差也增大;不同偏移距离下,示值误差随着流速的增大而增大,并逐渐趋于稳定。锥形管条件下,随着流速的不断增大,各流速点下的压差变大,相对示值误差也不断增大;随着锥角的继续增大,压差值与流速值呈指数函数变化趋势,各流速点对应的相对示值误差明显增大。因此,不同偏移距离、不同锥角管段都会对压差有直接影响,导致测量示值误差失真,研究结果为今后采用S型皮托管对烟道或烟函的气体污染物排放测量提供理论支撑和相关数据参考。


Simulation study on S type pitot tube flow measurement based on CFD
WANG Peng1,2, MU Jun1, LEI Zhenjia1
1. Xinjiang Uygur Autonomous Region Research Institute of Measurement &Testing, Urumqi 830011, China;
2. College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, China
Abstract: In view of the pitot tube measurement of pipeline gas emissions have limitations, this article is based on CFD to the S type pitot tube, respectively in different distance and angle section under the condition of carrying out the simulation of single factor experiment, first set up the objective function of the differential pressure ΔP of the S type pitot tube calibration coefficient is 0.85, further study on flow field in different conditions on the pressure difference, the influence of the relative error value. The results show that under the condition of straight pipe, with the increase of air flow velocity, pressure differential shows the change rule of consistent; under the same speed, the greater the offset distance, the greater the pressure differential, also increase of error; under different migration distances, the error of indication increases with the increase of velocity and tends to be stable gradually. Tapered tube conditions, with the increasing of flow rate, the flow rate under the point of the differential, relative error value is increasing; as the cone Angle continues to increase, the pressure difference and velocity value change exponentially, and the relative value error corresponding to each velocity point increases obviously. Therefore, different distance and Angle section will have a direct influence on the differential, lead to measure distortion of error of indication, the S type pitot tube measured point velocity can't completely replace the average velocity of cross section, this study will be used for the S type pitot tube for flue or smoke gas pollutants discharge measurement to provide theoretical support and reference data.
Keywords: CFD;S type pitot tube;straight pipe section;conical pipe;pressure difference
2020, 46(8):119-124  收稿日期: 2019-10-11;收到修改稿日期: 2020-01-27
基金项目: 国家十三五重点研发计划NQI重点专项(2017YFF0205301)
作者简介: 王鹏(1984-),男,安徽阜阳市人,工程师,硕士,主要从事流量计量工作
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