轴流压气机气动弹性失稳的实验研究

本文介绍了在跨音压气机试验台上对BF-1系列转子开展气动弹性失稳的实验研究工作。文中提出了实验模型的零阻尼设计原则,描述了失速颤振发生的过程。分析了失速颤振发作时的气动声学现象——一种特殊的啸声。此外还给出了两种叶尖间隙和两种叶型对失速颤振影响的实验结果。最后对经验预测方法和实验结果作了对比,符合情况较好。

EXPERIMENTAL RESULTS OF AEROELASTIC INSTABILITY OF AN AXIAL COMPRESSOR

This paper describes the initial experimental results of aeroelastic instability of BF-1 rotors on a transonic axial compressor facility at BIAA. Designing of BF-1 rotors depends upon the principle that the total damping is equal to zero at the point near the stall flutter boundary. The experimental results show that the design principle of BF-1 rotors is correct. Two rotors, BF-1-1 and BF-l-2,have been run from 8000 rpm to 16500 rpm. Several flow-induced vibration phenomena such as stalling flutter,wake-induced vibration, stall vibration of the blades,have been observed in experiments. In addition,a loud monotonous screaming has been heard during the stalling flutter onset. A primary theoretical analysis of this special sound is discussed. This paper also presents the experimental results of effects of the blade tip clearance and the airfoil shape on the stall flutter boundary. By comparison of the empirical methods to predict the stall flutter onset with the experimental results,it is believed that these prediction methods are acceptable.