座舱盖抛放过程中的非定常气动特性研究

 通过对N-S方程的数值求解模拟了座舱盖在静止和旋转两种状态下的气动力分布,分析了来流马赫数、旋转角速度以及迎角对气动系数的影响,研究了座舱盖自由抛放过程的非定常效应,并最终建立了预测座舱盖自由抛放过程气动系数的气动系数图。计算表明:(1)非定常效应是影响抛放过程座舱盖气动力分布的主要因素;(2)外形左右对称的座舱盖,均有非定常气动系数平均值与无量纲角速度成线性关系的规律,而且变化斜率几乎与舱盖形状尺寸等无关。

Unsteady Aerodynamics Characteristic Study of a Jettisoned Aircraft Canopy

The steady and unsteady aerodynamics of aircraft canopy are simulated by solving the N-S equation for analysing the influence of unsteady aerodynamic effect,the orientation of the body and Mach number of the free flow on aerodynamic coefficients.Furthermore,the aerodynamic look-up graph is established.The result shows that the unsteady aerodynamic effect is the main influencing factor on aerodynamic load distribution and different canopies have the similar rule,i.e.,integrated aerodynamic coefficients is linear with non-dimensional pitching velocity.