双扭线流量管测量方法数值研究
Numerical study on the twisted-pair flow tube measurement method
高杰 1冯飞 1王磊 1魏崇 1赵正1
作者信息
- 1. 中国航发四川燃气涡轮研究院,四川 绵阳 621000
- 折叠
摘要
围绕双扭线流量管测量方法中,测量截面静压不均匀和附面层修正方法两个影响因素,采用数值仿真的方法模拟了双扭线流量管试验测量,分析了测量截面静压不均匀和附面层修正方法对流量测量的影响.结果表明:静压测量截面距离双扭线切点越近,测量截面静压不均匀性对主流区流量计算偏差的影响越大,可通过建立静压关联关系式进行修正;试验中采用积分法计算附面层流量时,近壁区速度分布与线性分布存在差异,导致第1个测点与壁面间区域积分流量存在偏差,可按指数分布规律重构近壁区速度进行修正.
Abstract
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.
关键词
双扭线流量管/空气流量测量/附面层修正方法/静压不均匀/轴流压气机/航空发动机Key words
twisted-pair flow tube/air flow measurement/boundary layer correcting method/non-uniform static pressure/axial compressor/aero-engine引用本文复制引用
出版年
2024
NETL
NSTL
万方数据