Identifying the influence of design parameters of a hydrostatic bearing in an aircraft fuel pump on its static characteristics
DOI:
https://doi.org/10.15587/1729-4061.2023.289426Keywords:
hydrostatic bearing, gear pump, load-bearing capacity, flow balance, temperature regimeAbstract
The object of this study is hydrostatic processes in the sliding bearings of gear-type aviation fuel pumps.
The problem of the influence of the design parameters of the fuel pump bearing on its static characteristics was solved. Load-bearing capacity, lubricant consumption, and operating temperature conditions were considered as static characteristics. The determination of these characteristics was based on the pressure distribution function in the working fluid layer. An option was adopted with two load-bearing chambers located on the working surface of the hydrostatic bearing. Three options for the circumferential arrangement of chambers relative to the line of action of the external load were studied. A quantitative assessment of the effect of increasing the temperature of the working fluid on the consumption of lubricant and bearing capacity is given.
It has been established that with an increase in the angle of position of chambers relative to the line of action of the external load, the flow rate of the working fluid in the bearing increases, and its load-bearing capacity decreases. With a clearance in the bearing of 0.0225 mm, with an increase in the angle of the chambers from 30° to 40°, the flow of working fluid through the bearing increases by approximately 1.64 times. When the gap increases to 0.0425 mm and the angle of the chambers changes from 30° to 40°, the flow rate of the working fluid increases by approximately 1.2 times. The load-bearing capacity of the bearing with an increase in the chamber position angle from 30° to 40° decreases with a gap of 0.0225 mm by approximately 1.6 times, and with a gap of 0.0425 mm by approximately 1.93 times.
An increase in the temperature of the working fluid leads to a decrease in the load-bearing capacity of the bearing by 2.5 % and an increase in the flow rate of the working fluid in the bearing by 4.6 %.
The results allow for more rational design of hydrostatic bearings for fuel gear pumps.
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