基于CFD方法的俯仰静、动导数数值计算

应用时空二阶精度的隐式迭代NND算法,数值模拟了尖锥、钝锥、弹道外形和飞船返回舱等典型再入飞行器作强迫俯仰振荡的粘性动态流场,给出动态气动力和力矩系数的时间历程,在此基础上,运用积分法和奇异分解线性最小二乘法辨识静、动态气动稳定性参数,并与试验结果及半经验理论预测方法进行了比较,表明本文方法具有准确度较高、效率较高及适应性广等优点.

The pitching static/dynamic derivatives computation based on CFD methods

An implicit subiteration NND scheme with second order in time and space is applied to numerically simulate the unsteady flows over several vehicles in forced pitching movement. These vehicles include point cone, blunt cone, hyperballistic shape and reentry capsule. Then the time history of dynamic aerodynamic force and moment coefficients are got, and based on these data, the static/dynamic derivatives of pitching are fitted by integral and linear least square methods. By comparison the present computational results to the experimental data and computational data by engineering method, it indicates that the present method has satisfactory order and efficiency and be suitable to application on engineering problems.