CAJ | 학술논문

随着旋转机械工作介质向高参数方向发展，密封气流激振力成为影响旋转机械转子稳定性的重要因素之一。介质参数提高后，由密封流体动压产生的气体轴承效应增强，密封气流激振力增大。借鉴错位轴承理论，提出一种负错位密封结构，可降低流体动压效应，抑制密封气流激振力。应用CFD 技术建立负错位密封与传统圆形密封流场特性求解模型，分析比较2种密封形式周向压力分布特性的差异，研究错位率、转速、偏心、压比等因素对2种密封形式气流力的影响规律。研究结果表明，负错位密封与传统圆形密封泄漏特性相当；与传统圆形密封相比，负错位密封周向压力差小，气流激振力小，负错位密封稳定性好。
수착선전궤계공작개질향고삼수방향발전，밀봉기류격진력성위영향선전궤계전자은정성적중요인소지일。개질삼수제고후，유밀봉류체동압산생적기체축승효응증강，밀봉기류격진력증대。차감착위축승이론，제출일충부착위밀봉결구，가강저류체동압효응，억제밀봉기류격진력。응용CFD 기술건립부착위밀봉여전통원형밀봉류장특성구해모형，분석비교2충밀봉형식주향압력분포특성적차이，연구착위솔、전속、편심、압비등인소대2충밀봉형식기류력적영향규률。연구결과표명，부착위밀봉여전통원형밀봉설루특성상당；여전통원형밀봉상비，부착위밀봉주향압력차소，기류격진력소，부착위밀봉은정성호。
With the development of rotating machine operating parameters, the air induced force generates in seals is increasingly becoming one of the most important factors to influence the stability of the rotor system. Air induced force that increases as gas bearing action generates from hydrodynamic in seal becomes bigger with the rotating machine operating parameters intensifying. The paper presented a kind of negative dislocated seal based on the dislocated bearing theory, it can eliminate hydrodynamic action and reduce air induced force. The computational fluid dynamics model for the flow field characteristic of the negative dislocated seal and traditional round seal was set up. The paper relatively analyzed the flow field characteristic difference for the two types of seals, and the influence factors of dislocate ratio, speed, eccentricity, pressure ratio, preswirl were investigated. Numerical results show that the leakage between the negative dislocated seal and traditional round seal is almost equivalent, the negative dislocated seal has less fluid-induced force and better stability.