基于回转体尾流场LDV的测量值计算压力分布

Pressure Distribution Calculation Based on Measured Stern Flow Velocity by Using LDV Unit for an Axisymmetric Body

本文介绍回转体尾流场的LDV测量过程和结果，以及根据这些结果用积分路线方法换算压力分布的原理和技巧，文中详细表达了尾流场中由于存在尾翼对流动的影响，包括雷诺应力和边界层内速度图形的变化。沿积分路线的速度变化测量确定后，对每个节点邻域内作曲线拟会，再从平均雷诺方程（RANS）积分求得压力分布。最后与直接测量数据比较，结果表明基于测量的速度场所计算的压力分布与测量数据非常吻合，说明传统的Bernoulli方程求压力的途径在回转体尾流场中会出现很大误差，而用本文导出方法可达令人满意的效果。

Measuring process and measured results on stern flow by using LDV unit are introduced in this paper for the axisymmetric body with and without four identical tailplanes. The principle of pressure distribution calculation based on the measured velocity field along the path of integration is also presented. The effects of tailplanes on stern flow, including Reynolds stress and velocity profiles within boundary layer were taken into consideration in this work in detail. The curve fitting technique was applied near each node after measuring velocity data along integral path. Then, pressure distribution can be determided through integrating RANS equations. Finally, a comparison of pressure between calculated values hased on measured velocity data and directly measured values was made to check the calculating method. The results show that calculated values are quiae agreeable to those directly measured. More errors may occur during transforming velocity into pressure according to traditional Bernoulli e-quation at the stern flow field of an axisymmetric body. The results developed in this paper are quite satisfactory.