水下应用栅格翼动态展开参数预示方法

基于水下应用栅格翼动态展开过程动力学模型,根据展开特征角度定常水动力方法,拟合获得展开全程受到的流体力矩,并引入考虑相对速度影响的修正因子,形成水下应用栅格翼动态展开过程参数工程预示方法,以典型展开时序点航行体运动参数为设计输入,对栅格翼展开过程运动参数进行预示。通过与水下应用栅格翼非定常流场仿真计算数据以及水下航行体弹射试验数据对比,验证了上述预示方法的正确性及工程适用性,为水下应用栅格翼方案设计的优化及展开不同步性分析提供设计参考。

Prediction method on parameters of underwater grid fins during the procedure of dynamic expansion

With the development of the technology in underwater launching, the grid fins are designed as a practice in fluid dynamic control. As the time during the underwater vertical launching is less than 3 seconds and the grid fins generally start to expand once the vehicle leaves the launch device, the expansion time and motion parameters are the key design parameters. Based on the kinetic model of underwater grid fins during the procedure of dynamic expansion, a prediction method available in practical applications is developed in this paper, which takes the motion parameters at typical expansion points as the design input. The through hydrodynamic moment used in the kinetic model is fitted by the values obtained in steady hydrodynamic conditions with specific expansion angles. A modified factor in consideration of the relative velocity is included as well. By comparing with the results obtained by unsteady numerical simulations and the underwater vehicle experiment data, the prediction method is verified, which will provide design reference for the optimum proposal of underwater grid fins and the analysis of out of sync expansion.