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一、前言 在叶轮机械非定常气动力的研究中,探索振动叶栅叶片间振动相位差对非定常气动力影响的规律,可以大大节省对叶片进行颤振预估的理论与实验方面的工作量,具有重要意义。在现已发表的文献中,虽然给出了几种相位差下某种振型的实验结果或理论分析,但只限于一种振型下的少数几个相位差,而且也没有得出定量的规律。由于以往计算非定常气动力的方法太烦杂且又受到各种限制,要进行系统分析是十分困难的。文献[3]提出的求解振动叶栅非定常气动力的“振荡中心流线法”,提供了一种适应性广、计算简单
I. Introduction In the study of unsteady aerodynamics of impeller, exploring the law of the influence of the vibration phase difference between the vibrating cascades on the unsteady aerodynamics can greatly save the theoretical and experimental workload of flutter prediction , Of great significance. In the published literature, experimental results or theoretical analyzes of some mode shapes at different phase differences are given, but only a few phase differences in a mode shape are obtained, and no quantitative law. Due to the previous method of calculating unsteady aerodynamics is too complicated and subject to various restrictions, it is very difficult to conduct systematic analysis. The “oscillation center streamline method” proposed in reference [3] for solving unsteady aerodynamic forces of vibrating cascades provides a wide adaptability and simple calculation