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采用非定常双时间步长方法、刚性旋转动网格技术,结合空间隐式格式数值分析了高超声速钝锥体定常与非定常流场特征,并运用最小二乘法辨识出钝锥体的俯仰阻尼导数。通过与相应的实验数据、工程估算值进行比较,分析并验证了壁面网格雷诺数、钝头比、攻角与质心位置对钝锥体俯仰阻尼导数的影响。同时采用五种差分格式,其中包含五阶精度WENO与高精度WNND格式,对钝锥体俯仰阻尼导数进行了计算,结果表明不同无粘差分格式对俯仰静导数影响较小,但不同格式之间俯仰动导数结果存在差异,分析认为差分格式之间不同的粘性分辨率应是差异的主要来源。
The unsteady two-time step method and the rigid rotating mesh technique were used to analyze the characteristics of steady and unsteady flow fields of hypersonic dumbbells in combination with the implicit space numerical value. The least square method was used to identify the pitching damping Derivative. The effects of wall mesh Reynolds number, blunt nose ratio, angle of attack and center of mass on the pitch-dependent damping derivative of the blunt cone are analyzed and verified by comparing with the corresponding experimental data and engineering estimates. At the same time, five differential schemes, including WENO and WNND, are used to calculate the derivative of pitch cone damping. The results show that different non-stick difference schemes have less influence on pitch derivative, but different formats The result of pitch-derivative is different. It is concluded that the different viscous resolution between different formats should be the main source of difference.