论文部分内容阅读
采用计算流体力学与结构动力学相结合的方法,数值模拟了大负荷弯掠扭组合叶片非定常粘性流场;通过对叶片表面非定常气动力及其所做非定常气动功的计算分析,采用能量法对叶片颤振与否进行预估判断。在气动设计满足设计要求的基础上,小范围调整大负荷弯掠扭组合叶片的最大厚度分布和最大厚度相对位置分布,并分别进行颤振预估计算。结果表明,最大厚度分布和最大厚度相对位置分布对颤振影响明显。在最大厚度相对位置分布相同的情况下,均匀减薄叶片,会使一阶动频减小,积累功率增大,颤振发生的可能性增大。研究结果对叶轮机颤振机理研究具有一定的参考意义。
By using the method of CFD and structural dynamics, the unsteady viscous flow field of a blade with large load and swept-twist is numerically simulated. By analyzing the unsteady aerodynamic forces of the blade surface and the unsteady aerodynamic work done by the blade, Energy law on the flutter of the blade or not to judge. On the basis of the aerodynamic design meeting the design requirements, the maximum thickness distribution and the maximum thickness relative position distribution of the blade with large load slewing torque are adjusted in a small area, and the flutter estimation is calculated separately. The results show that the distribution of the maximum thickness and the relative thickness of the maximum thickness of the location of the obvious impact on the flutter. Under the condition of the same distribution of the maximum thickness, the uniform thinning of the blades will decrease the first-order moving frequency, increase the accumulated power and increase the possibility of chattering. The research results have certain reference meaning for the research of flutter mechanism of impeller.