Numerical study on the twisted-pair flow tube measurement method
Based on the two influencing factors of static pressure non-uniformity of the measuring section and boundary layer correcting method,the test measurement of a twisted-pair flow tube was simulated with numerical methods to analyze the influence of the factors on the flow measurement.The results show that the closer the measuring section of static pressure is to the tangent point of the twisted-pair line,the greater the influence of the non-uniformity of static pressure on the flow deviation in the main flow area,which can be corrected by establishing the static pressure correlation formula.When the boundary layer flow is calculated by the integral method in the test,the velocity distribution in the near wall region is different from the linear distribution,leading to the difference in the integrated flow between the first measuring point and the wall.It can be corrected with the reconstruction of the velocity field in the near wall region by exponential distribution law.
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