格栅下游湍流特性的研究

The Measurement of Turbulence Characters of the Grids in a Shock Tube

恒温热线风速仪在激波管中(来流条件T_0=290～315K,U_∞=20～60m/s)测量了四种形状不同的格栅下游湍流特性。结果表明:在相同条件下,圆柱形格栅能产生较大的湍流度,其下游湍流度随距离增加而减小,随来流雷诺数增加而增加。

The turbulent characters for four kinds of the grids downstream were measured in a shock tube, using a constant temperature anemometer at free stream conditions. U∞ = 20~60m/s; T0=290~315K. The results indicate that more intense turbulence appears downstream of the bars-grid than other grids at same free stream conditions. The turbulence decreases with increasing distance downstream from the bars-grid, and increases with increasing freestream Reynolds number.