论文部分内容阅读
通过求解雷诺平均N-S方程并采用影响系数法,对三个基本正交模态的三维振荡涡轮叶片绕流问题进行了研究。结果表明数值模拟所得非定常气动力与实验吻合较好;基于刚体运动假设和模态叠加法,得到了可用于叶轮机械设计阶段颤振稳定性评估的稳定性参数图/气动阻尼图,即所有可能的刚体运动及其相应气动阻尼的关系图;通过对稳定性参数图/气动阻尼图的分析表明,在一定情况下振型对颤振稳定性有重要影响,应将其作为颤振稳定性设计的重要参数之一。
By solving the Reynolds-averaged N-S equation and using the influence coefficient method, the flow around three-dimensionally oscillating turbine blade with three orthogonal modes was studied. The results show that the unsteady aerodynamic force obtained by numerical simulation is in good agreement with the experiment. Based on the assumption of rigid body motion and the modal superposition method, the stability parameter map / aerodynamic damping map which can be used to evaluate the flutter stability of the impeller is obtained. Possible rigid body motion and its corresponding aerodynamic damping; Through the analysis of the stability parameter map / aerodynamic damping diagram shows that under certain circumstances the mode shape has an important impact on the flutter stability, which should be used as the flutter stability One of the important parameters of the design.