| Citation: | FU Jiangfeng, LI Huacong, FAN Ding, et al. Lubrication characteristics analysis of a type of self-cooling structure fuel pump sliding bearings[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2052-2062. doi: 10.13700/j.bh.1001-5965.2017.0762(in Chinese)
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The aim of this paper was to study the lubrication characteristics of sliding bearings for aeroengine fuel gear pumps under low medium viscosity and self-cooling conditions. Based on the Reynolds equation for hydrodynamic lubrication of oil film and equivalent viscosity lubrication flow model, the energy equation of the internal flow was simplified by assuming the adiabatic flow of the gear pump sliding bearing, and the thermal flow lubrication mathematical model of fuel pump sliding bearing was established based on the combination of Reynolds equation and adiabatic flow energy integral equation. Then the lubrication characteristics of sliding bearings, including the oil film pressure, oil film thickness, film temperature, surface leakage, and friction, were simulated and analyzed based on CFD numerical simulation and finite difference method under different clearance ratios, eccentricity ratios and width diameter ratios. The simulation results show that the radial load calculation accuracy of sliding bearing is better than 4.0% by CFD method. The oil film pressure decreases monotonically with the increase of the clearance ratio, and the oil film thickness increases with the increase of the clearance ratio under the condition of constant eccentricity ratio. Under the condition of constant clearance ratio, with the increase of eccentricity ratio, the oil film pressure gradually increases and the oil film thickness decreases, while the oil film temperature is inversely proportional to the film thickness, and the peak value of temperature is more and more obvious. Also, the oil film pressure of the sliding bearing can be increased by increasing the width diameter ratio when the eccentricity ratio and clearance ratio are constant. Therefore, in order to improve the lubrication performance of sliding bearing, it is needed to design a reasonable clearance ratio, width diameter ratio and eccentricity ratio of sliding bearings by considering the factors of oil film pressure, leakage, thickness and temperature rise and the interaction among them.
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