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提出采用格栅将测量截面划分为若干单元,在整流的同时进行单元测量,在全截面上分布感压孔,将感压管连接至一个大腔体以获得平均压力,从而获得短管道气体平均流速的测量方法.对截面为800mm×500mm的格栅的整流效果进行数值模拟.结果表明:设置格栅可以实现大风箱分支管整流的目的;随着格栅密度的增加,每个单元内的气体流速趋于稳定;格栅整流效果与其位置关联不大,但与格栅厚度关联密切,当厚度超过200mm时,对整流的影响逐渐减弱;在较理想的格栅密度、格栅位置和格栅厚度条件下,各网格的平均压力与支管的平均流速线性度非常好.
It is proposed that the measurement cross section be divided into several units by grid, unit measurement is carried out at the same time of rectification, pressure sensing holes are distributed on the full cross section, and the pressure sensing pipe is connected to a large cavity to obtain average pressure so as to obtain short pipe gas average Flow rate measurement method is used to simulate the rectification effect of grid with cross section of 800mm × 500mm.The results show that the grille can be used to rectify the branch duct of wind tunnel.With the increase of grid density, The gas flow rate tends to be stable; the effect of grid rectification is not related to its location, but it is closely related to the thickness of the grid. When the thickness exceeds 200 mm, the influence on rectification is weakened gradually. At the ideal grid density, Under the condition of grid thickness, the average pressure of each grid and the average flow velocity of the branch pipe are very linear.