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为了获得一个准确高效的非定常空气动力学模型并将其应用于叶轮机叶片颤振特性分析中去,论文发展了一种基于CFD方法的叶轮机非定常气动力组合建模方法,可以快速计算叶轮机叶片在等相角差振动时的气动阻尼系数。运用小扰动流场的叠加原理,通过不同通道数模型的非定常流场求解(通常需要两次或三次),针对流场的周期性边界条件,组合分析得到一系列更多通道数情况下的非定常气动力低阶模型。基于这种降阶模型计算的气动阻尼系数与直接的CFD方法计算结果吻合很好,计算效率提高10倍以上。
In order to obtain an accurate and efficient unsteady aerodynamic model and apply it to the flutter analysis of impeller blades, a CFD method based on unsteady aerodynamic modeling of impeller is developed, which can be quickly calculated Aerodynamic damping coefficient of impeller blades during equal phase difference vibration. The superposition principle of small perturbed flow field is used to solve the unsteady flow field of the numerical model of different channels (usually two or three times). For the periodic boundary conditions of the flow field, a series of more channel numbers Unsteady aerodynamic low-order model. The calculated aerodynamic damping coefficient based on this reduced order model is in good agreement with the direct CFD method, and the computational efficiency is improved more than 10 times.