Beating chamber is one of important components that support aero-engine rotors and research on oil droplet and oil film motions is an important part of bearing chamber lubrication and heat transfer design. Consid- eri...Beating chamber is one of important components that support aero-engine rotors and research on oil droplet and oil film motions is an important part of bearing chamber lubrication and heat transfer design. Consid- ering the pressure of sealing air is an important operating condition that affects the oil droplet and oil film mo- tions, the effect of sealing air pressure on airflow in bearing chamber is investigated in this paper firstly ; and then based on the air velocity and air/wall shear force, the oil droplet moving in core air, deposition of oil droplet im- pact on wall as well as velocity and thickness of oil film are analyzed secondly; the effect of sealing air pressure on oil droplet velocity and trajectory, deposition mass and momentum, as well as oil film velocity and thickness is discussed. The work presented in this paper is conducive to expose the oil/air two phase lubrication mechanism and has certain reference value to guide design of secondary air/oil system.展开更多
Because of relatively large protective area and good underwater welding quality, chamber underwater welding has a great using prospect in spent fuel pool maintenance at nuclear power plant. A chamber local dry automat...Because of relatively large protective area and good underwater welding quality, chamber underwater welding has a great using prospect in spent fuel pool maintenance at nuclear power plant. A chamber local dry automatic underwater welding test system with a data acquisition platform is developed, drainage seal tests in a water tank are carried out and the data acquired from the tests are analyzed. The results show that the chamber local dry underwater welding test system can achieve good drainage seal, the drainage effect is enhanced with the increase of the drainage gas flow rate and the drainage time. The results establish the foundation of the research of chamber local dry underwater welding.展开更多
基金supported by the Natural Science Foundation of China under Grant No.51275411
文摘Beating chamber is one of important components that support aero-engine rotors and research on oil droplet and oil film motions is an important part of bearing chamber lubrication and heat transfer design. Consid- ering the pressure of sealing air is an important operating condition that affects the oil droplet and oil film mo- tions, the effect of sealing air pressure on airflow in bearing chamber is investigated in this paper firstly ; and then based on the air velocity and air/wall shear force, the oil droplet moving in core air, deposition of oil droplet im- pact on wall as well as velocity and thickness of oil film are analyzed secondly; the effect of sealing air pressure on oil droplet velocity and trajectory, deposition mass and momentum, as well as oil film velocity and thickness is discussed. The work presented in this paper is conducive to expose the oil/air two phase lubrication mechanism and has certain reference value to guide design of secondary air/oil system.
基金This work is supported by the National Natural Science Foundation of China （No. 51205026） and the Natural Science Foundation of Beijing （ No. 3102012）.
文摘Because of relatively large protective area and good underwater welding quality, chamber underwater welding has a great using prospect in spent fuel pool maintenance at nuclear power plant. A chamber local dry automatic underwater welding test system with a data acquisition platform is developed, drainage seal tests in a water tank are carried out and the data acquired from the tests are analyzed. The results show that the chamber local dry underwater welding test system can achieve good drainage seal, the drainage effect is enhanced with the increase of the drainage gas flow rate and the drainage time. The results establish the foundation of the research of chamber local dry underwater welding.
