非对称导叶布局及其减振机理研究

项目名称： 非对称导叶布局及其减振机理研究

项目编号： No.51306003

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 张明明

作者单位： 北京工业大学

项目金额： 25万元

中文摘要： 本项目的研究目标是通过开展上游气流激振力在非对称布局下对叶片振动特性影响的物理机理分析，探索叶片系统在流动诱发振动过程中的流固耦合传递机制和共振响应机制，研究到其一般规律，获得高性能叶轮机非对称布局优化设计技术、流固耦合一体化预测方法，促进叶轮机械新型设计技术的发展。研究的主要内容包括研究叶轮机静子叶片非对称布局降低振动应力的气动设计准则，通过设计不同形式的叶片布局以优化流场的时空结构，在一定频率范围内降低气流激振力进而控制叶片的强迫响应水平；考虑叶片振动、气体动力学的耦合系统，探讨转子叶片在不同非对称导叶布局下振动响应的频率及幅值特性的变化，并获得转子叶片振动应力的一般性高精度数值预测方法。本项目将深入研究非对称导叶布局设计技术与减振机理，为提升叶轮机气动性能和结构可靠性做基础研究。

中文关键词： 叶轮机械；流动诱发振动；流固耦合；非对称；减振

英文摘要： In this project, a transient analytical method of blade forced response under stator-rotor wake influence is proposed in dealing with asymmetric aerodynamic load. After investigating the vibration characteristics of the blades under the wake excitation of the asymmetric vane spacing from upstream, the fluid-structure interaction mechanism of transmission and resonance is analyzed in the flow induced vibration mode of the blades. The effect of asymmetric spacing in the turbomachinery is studied as well as the method of integrated optimization under the interaction of fluid-structure. It is significant both in method and engineering application to improve the numerical prediction method of aeroelastic stability suitable for engineering design. The work can be summarized as follows. The reduction effect on the vibratory stress due to the asymmetric vane spacing is examined. It is possible to optimize the structure of flow field resulting from the stator vane by shifting the circumferential position of some or all of the vanes. Then the asymmetric vane spacing can result in decreasing the levels of the excitation force at specific frequencies to control the blade forced response downstream. The vibratory response of the blades is calculated by the transient response analysis for different asymmetric vane spacing.

英文关键词： turbomachinery；flow induced vibration；fluid-structure interaction；asymmetric；vibration reduction