CAJ | 학술논문

针对离心压缩机转子失稳已成高效长周期运转主要障碍问题，通过分析失稳机理及影响因素，研究压缩机转子系统稳定性控制方法。结合工程案例，采用有限元方法对转子进行瞬态动力学分析，研究转速及因密封等部件交叉刚度对转子稳定性影响。研究转子振动位移反馈与速度反馈方法对转子失稳振动的控制效果。结果表明，两种方法均能有效提高转子系统稳定性。对比在达到相同控制效果时执行机构能量消耗表明，通过位移反馈方式能以更低能耗达到控制效果。该结果可为离心压缩机转子稳定性控制与提高提供新的思路及可行性。
침대리심압축궤전자실은이성고효장주기운전주요장애문제，통과분석실은궤리급영향인소，연구압축궤전자계통은정성공제방법。결합공정안례，채용유한원방법대전자진행순태동역학분석，연구전속급인밀봉등부건교차강도대전자은정성영향。연구전자진동위이반궤여속도반궤방법대전자실은진동적공제효과。결과표명，량충방법균능유효제고전자계통은정성。대비재체도상동공제효과시집행궤구능량소모표명，통과위이반궤방식능이경저능모체도공제효과。해결과가위리심압축궤전자은정성공제여제고제공신적사로급가행성。
For a centrifugal compressor,as its capacity,compression ratio and efficiency,instability of its inner rotor-bearing system becomes the major obstacle for its operation in a long period without shutdown.Based on the study on its mechanism and influencial factors,the control strategy for improving the stability of the rotor bearing system was discussed.By introducing a case study about a centrifugal compressor with several instable faults,the transient response was investigated to find the effect of rotating speed and cross coupling stiffness of seal on the stability of rotor.Then the force exerted on the rotor was controlled by using a controller through two ways,namely,the displacement feed-back and velocity feed-back strategy.With displacement feed-back,the controller functions as a spring with cross-coupling stiffness against the seal.While,it functions as a damper when velocity feed-back was adopted.The results indicate that both strategies can depress the vibration caused by the instability of the rotor.Furthermore,the displacement feed-back strategy has high efficiency because of its lower power consuming.The results can provide some new insight and feasibility for controlling or upgrading the stability of compressor rotor-bearing system.