基于LDV的超高速循环水槽流场流速测量

A Research on Velocity Measurement of Flow Field in Super High Speed Circulating Water Tank Based on LDV

循环水槽试验段流场的不均匀度和紊流度是衡量循环水槽流场品质的重要指标。为研究超高速闭式循环水槽试验段的流场品质,在8种来流速度下,采用激光多普勒测速仪(Laser Doppler Velocimeter,LDV),通过建立流场测量点阵列对循环水槽试验段的3处流场截面进行轴向流速测量,并对其不均匀度和紊流度进行计算。试验结果表明:在8种来流速度下,试验段流场截面流速的不均匀度均小于1%;在8 m/s的试验段来流速度下,截面流场的紊流度均小于0.5%。试验测量结果满足循环水槽流场品质对不均匀度和紊流度的技术指标要求,可为超高速闭式循环水槽的试验研究和优化设计提供初步的测试数据支撑。

The non-uniformity and turbulence of the flow field in the test section of circulating water tank are important indicators to measure the flow field quality of the circulating water tank.In order to study the flow field quality of the test section of the closed super high speed circulating water tank,the Laser Doppler Velocimeter(LDV)is used to measure the axial flow velocity of the three flow field sections in the test section of the tank by establishing a flow field measurement point array under eight flow velocities,and the non-uniformity and turbulence are calculated.The test results show that the non-uniformity of the cross-sectional velocity of flow field in the test section is less than 1%under eight inlet velocities and the turbulence of cross-sectional flow field under the flow condition of 8 m/s test section is less than 0.5%.The test results meet the technical requirements of the flow field quality of circulating water tank for the non-uniformity and turbulence and provide the preliminary test data support for the experimental research and the optimization design of closed super-high speed circulating water tank.