【摘要】 运用偏振分离型ＬＤＶ系统对流经管内四孔通道的不可压湍流流动过程进行了测量研究。结果表明，通孔下游附近，流动具有湍动射流特征；管壁附近存在明显的回流再附区；在轴向时均速度分布趋于稳定前后，轴向湍流度由大于切向湍流度变化至两者近似相等。更多还原

【Abstract】 The behavior of the flow emerging from the 4-hole perforated plate was investigated experimentally in a circulating water pipe rig by using a 2-component LDV system。The flow downstream of the perforated plate shows the same leading features asthose of a turbulent jet.The reverse flow region is observable near the pipe wall.The axial turbulence intensity is about twice larger than the tangential turbulence intensity beforethe radial distribution of axial velocity tends to be stable,thereafter both intensities areabout equal.更多还原