| 1 | Novel design and simulation of curved blade oil scoop with high oil capture efficiency显示文摘As the load and working environment temperature increasing,high efficiency oil lubrication was urgently needed for the main bearing of aeroengine.However,the low oil capture efficiency of radial oil scoop affects the application of under-race lubrication structure with radial oil collection.In this work,a novel design of curved blade oil scoop for under-race lubrication is proposed to improve the oil capture efficiency.First of all,the principle of relative velocity optimization is proposed by analyzing the collision process between blade and oil jet for theoretical research.Then,the theoretical curve equations of blade inlet under three different oil jet incidence conditions are solved.After that,the monotonicity of the theoretical curves is analyzed.The effects of rotation speed,oil jet velocity,eccentric distance of oil jet,and include angle of curve are analyzed.The location of the collision points of proposed theoretical curves are also been optimized.Finally,a transient Computational Fluid Dynamics(CFD)simulation of the novel oil scoop design was carried out.The simulation results show that the capture efficiency of curved blade oil scoop can be improved by 30%comparing to the traditional design. | Jingwen QIN Hui GUO Huiqing JIANG Fuliang WANG Weiwei MAN Yaguo LYU | 2021 | Chinese Journal of Aeronautics2021，34，9： | 0 |
| 2 | Theoretical and Experimental Studies for the Transient Response of Cavity显示文摘During the transient state of aero-engine,cavity has evidently transient characteristics in the secondary air system.To investigate transient characteristics,theoretical and experimental studies were implemented for both static and rotating cavities.First of all,the typical transient response phenomena in secondary air system were investigated based on the basic concepts of the dynamic process.According to the basic theory of gas dynamics,the causes of transient phenomena were analyzed in two aspects,external disturbance,and system physical properties.Several dimensionless parameters were introduced to analyze the transient response characteristics of air system.Second,the experimental results of the static cavity indicated that the actual response time increased with the increase of the inlet pressure.The experimental results of the rotor-stator cavity showed that the low rotational speed on the response process had little effect,and the response time gradually increased when the speed continued to increase.Third,the test results of multiple components suggested that when the valve was opening the inlet pressure of the static cavity increased quickly and then reached a stable value,but the pressure of the static cavity,stable pressure cavity and rotor-stator chamber rose gradually.It was also obtained the actual response time of them was increased.The closer the measuring points were to the disturbance source,the shorter the delay time was. | HU Jianping LIU Zhenxia ZHU Pengfei LYU Yaguo | 2020 | Journal of Thermal Science2020，29，1： | 0 |
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