润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2015年
7期
60-64
,共5页
气穴%浮环轴承%油膜力%承载力
氣穴%浮環軸承%油膜力%承載力
기혈%부배축승%유막력%승재력
cavitation%floating ring bearing%oil film force%bearing capacity
气穴是高速油膜润滑轴承中不可避免的现象，气穴现象影响浮环轴承油膜承载力及稳定性。通过Fluent 软件中的混合物（ Mixture）多相流模型，分析气穴对浮环轴承内、外油膜压力分布以及含气率和供油压力对油膜承载力的影响。结果表明：气穴导致油膜压力峰值下降，对内油膜的影响大于外油膜；气穴会导致润滑油膜承载力下降，含气率越大，其承载力越低；在含气率不变时，供油压力对承载力有一定影响；油膜气穴主要集中分布在负压区，油膜压力值越小气穴现象越明显，气穴是导致油膜破裂的主要原因之一。
氣穴是高速油膜潤滑軸承中不可避免的現象，氣穴現象影響浮環軸承油膜承載力及穩定性。通過Fluent 軟件中的混閤物（ Mixture）多相流模型，分析氣穴對浮環軸承內、外油膜壓力分佈以及含氣率和供油壓力對油膜承載力的影響。結果錶明：氣穴導緻油膜壓力峰值下降，對內油膜的影響大于外油膜；氣穴會導緻潤滑油膜承載力下降，含氣率越大，其承載力越低；在含氣率不變時，供油壓力對承載力有一定影響；油膜氣穴主要集中分佈在負壓區，油膜壓力值越小氣穴現象越明顯，氣穴是導緻油膜破裂的主要原因之一。
기혈시고속유막윤활축승중불가피면적현상，기혈현상영향부배축승유막승재력급은정성。통과Fluent 연건중적혼합물（ Mixture）다상류모형，분석기혈대부배축승내、외유막압력분포이급함기솔화공유압력대유막승재력적영향。결과표명：기혈도치유막압력봉치하강，대내유막적영향대우외유막；기혈회도치윤활유막승재력하강，함기솔월대，기승재력월저；재함기솔불변시，공유압력대승재력유일정영향；유막기혈주요집중분포재부압구，유막압력치월소기혈현상월명현，기혈시도치유막파렬적주요원인지일。
Cavitation is an inevitable phenomenon in the high speed oil film lubrication bearing,which influences the oil film bearing capacity and stability of floating ring bearing.The influences of cavitation on the inner and outer oil film pres?sure distributionof floating ring bearing,and the gas holdup and oil supply pressure on the bearing capacity were analyzed by the mixture(Mixture)multiphase model in Fluent software.The results show that cavitation leads to the decrease of the oil film pressure’s peak value,and the influence to internal oil film is greater than the outer oil film.Cavitation will result in the decrease of bearing capacity of oil film,the greater the gas holdup,the lower the bearing capacity.The oil supply pressure has a certain effect on the bearing capacity at constant gas holdup.Analysis of oil film cavitation lays the founda?tion for the research on the leaning and instability of floating ring bearing.Cavitation is concentrated in the negative pres?sure zone,which isone of the main causes of oil film rupture.The phenomenon of cavitation is more obvious under small oil film pressure. Analysis of oil film cavitation lays the foundation for the research on the leaning and instability of floating ring bearing.
