昆明理工大学学报（自然科学版）
昆明理工大學學報（自然科學版）
곤명리공대학학보（자연과학판）
JOURNAL OF KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY（SCIENCE AND TECHNOLOGY）
2015年
2期
61-66
,共6页
滑动轴承%承载力%正压区%负压区%计算流体力学%两相流
滑動軸承%承載力%正壓區%負壓區%計算流體力學%兩相流
활동축승%승재력%정압구%부압구%계산류체역학%량상류
sliding bearing%bearing capacity%positive pressure zone%negative pressure zone%CFD%two -phase flow
液体动压滑动轴承对汽轮发电机转子系统的动态性能和运行稳定性有着至关重要的影响。基于润滑流体两相流理论，运用 Fluent 建立了滑动轴承的稳流和湍流三维 CFD 分析模型。仿真分析不同转速、进油压力、载荷和偏心率等关键参数对滑动轴承的油膜压力分布、油膜破裂和气穴分布特征等动态特性的影响规律。结果表明随着转速的增加，正、负压区的面积大小成反比变化，偏心率对油膜的动态特性影响较大。在转子高速运转时，适当增加油口进油压力以平衡转速致使油膜气化比例的增加，从而防止油膜破裂，有利于提高油膜的承载力和转子系统的运行稳定性。计算结果为运转状态下液体动压滑动轴承的动态性能分析提供了参考数据。
液體動壓滑動軸承對汽輪髮電機轉子繫統的動態性能和運行穩定性有著至關重要的影響。基于潤滑流體兩相流理論，運用 Fluent 建立瞭滑動軸承的穩流和湍流三維 CFD 分析模型。倣真分析不同轉速、進油壓力、載荷和偏心率等關鍵參數對滑動軸承的油膜壓力分佈、油膜破裂和氣穴分佈特徵等動態特性的影響規律。結果錶明隨著轉速的增加，正、負壓區的麵積大小成反比變化，偏心率對油膜的動態特性影響較大。在轉子高速運轉時，適噹增加油口進油壓力以平衡轉速緻使油膜氣化比例的增加，從而防止油膜破裂，有利于提高油膜的承載力和轉子繫統的運行穩定性。計算結果為運轉狀態下液體動壓滑動軸承的動態性能分析提供瞭參攷數據。
액체동압활동축승대기륜발전궤전자계통적동태성능화운행은정성유착지관중요적영향。기우윤활류체량상류이론，운용 Fluent 건립료활동축승적은류화단류삼유 CFD 분석모형。방진분석불동전속、진유압력、재하화편심솔등관건삼수대활동축승적유막압력분포、유막파렬화기혈분포특정등동태특성적영향규률。결과표명수착전속적증가，정、부압구적면적대소성반비변화，편심솔대유막적동태특성영향교대。재전자고속운전시，괄당증가유구진유압력이평형전속치사유막기화비례적증가，종이방지유막파렬，유리우제고유막적승재력화전자계통적운행은정성。계산결과위운전상태하액체동압활동축승적동태성능분석제공료삼고수거。
Hydrodynamic sliding bearing has significant influence on the dynamic performance and operational stability of turbine generator rotor system.Based on the two -phase flow theory,this paper establishes a three -dimensional CFD(computational fluid dynamics)analysis model of sliding bearing’s steady flow and turbulence. The effects of different key parameters such as simulation analysis speed,inlet oil pressure,load and eccentricity on sliding bearing oil film pressure distribution,oil film rupture distributions and cavitation characteristics dynam-ic characteristics are simulated and analyzed.The results show that with the increase of speed,the area of positive negative pressure zone changes inversely proportional and the eccentric rate has significant effect on the dynamic characteristics of oil film.When the rotor is running at a high speed,the appropriate increase in inlet oil pressure to balance the oil film gasifying speed ratio,so as to prevent the rupture of oil film,is helpful to improve the oper-ation stability of bearing and rotor system of oil film.The calculation results for the operating state of liquid pro-vide referential data for the analysis of the dynamic performance of sliding bearing.
