转子不平衡量的微型涡喷发动机轴承动反力分析

Research on Bearing Dynamical Reaction of Micro Turbojet Engine Based on Rotor Unbalanced Quantity

高速旋转的微型涡喷发动机转子系统的不平衡量对转子工作状态的影响尤为突出。在考虑陀螺效应的前提下,采用谐响应分析的方法,研究了微型涡喷发动机轴承动反力随转速及不平衡量分布方位角的变化规律。结果表明:转速越大,轴承处动反力越大,不平衡量的大小对轴承动反力影响远大于转速;涡轮和压气机的不平衡量分布方位角为180°时压气机一端轴承动反力最大,而涡轮一端轴承动反力最小。研究结论为减少微型涡喷发动机因不平衡量而产生的振动问题以及防止轴承破坏等提供了重要依据。

The unbalanced quantity of high-speed rotating micro turbojet engine in rotor system has espe- cially effects on working state of the rotor. On the premise that gyro is effective, the variations of bearing dynamical reaction in the micro turbojet engine with the rotating speed and unbalanced quantity distribu- tion azimuth angle are studied by using harmonic response analysis method. The results show that the greater the rotating speed is, the greater the bearing dynamical reaction, and the influence of the magni- tude of unbalanced quantity on bearing dynamical reaction is greater than that of rotating speed. The bear- ing dynamic reactions in the position of compressor and turbine are of maximum and minimum at unbal- anced quantity distribution azimuth angle of 180° respectively. The results of analysis provide an important reference for decreasing the vibration problem of engine and avoiding bearing damage caused by unbalanced quantity.