论文部分内容阅读
结合指尖密封动态工作特点,通过研究转速和转子不平衡力与转子跳动之间的关联规律,得到转子的位移激励,构建了指尖密封系统的动态计算模型,依据指尖密封的系统响应特征研究其泄漏间隙的获取办法,进而基于泄漏间隙特征建立了指尖密封动态泄漏量计算方法.针对某型发动机转子进行了动态泄漏量分析,结果表明:在转子每个转动周期内,指尖密封的动态响应跟随转子激励周期性变化,由此产生的动态迟滞泄漏间隙也随时间而周期性变化,迟滞泄漏的大小随着密封上下游压差的增加而增大,随着转子转速的升高先增加后减小;设置一定的装配过盈量能够一定程度地减小迟滞泄漏;指尖密封磨损后迟滞泄漏规律表现出先减小后增加再降低的变化趋势;与国内外试验结果的对比分析初步验证了提出的计算方法,为指尖密封动态性能设计方法研究提供了参考.
According to the dynamic characteristics of the fingertip seal, the displacement excitation of the rotor was obtained by studying the relationship between the rotor speed and rotor unbalance force and the rotor runout. The dynamic calculation model of the fingertip seal system was constructed. According to the system response characteristics of the fingertip seal, The method of obtaining the leakage gap is studied and the method of calculating the dynamic leakage of fingertip seal is established based on the characteristics of the leakage gap.According to the analysis of the dynamic leakage of a certain type of engine rotor, the results show that during each rotation period of the rotor, the fingertip seal The dynamic response follows the periodic change of the rotor excitation. The dynamic hysteresis leakage gap generated by the rotor periodically changes with time. The hysteresis leakage increases with the increase of differential pressure between upstream and downstream of the seal. With the increase of rotor speed First increase and then decrease; Setting a certain amount of assembly interference can reduce hysteresis leakage to a certain extent; The law of hysteresis leakage after finger seal wear shows the trend of decreasing firstly, then increasing and then decreasing again; Comparing with the test results at home and abroad The proposed calculation method is validated preliminarily, which provides a reference for the design of fingertip seal dynamic performance.