Study on the influence of internal clearance on the performance of aviation gear pump

DOI:	10.11809/bqzbgcxb2025.02.004
Keywords:	aviation gear pump; internal clearance; volumetric efficiency; flow pulsation; numerical simulation
Abstract:	Gear pump is the core power component of the aviation engine fuel system, and the clearance between the gear and pump body is a key parameter that affects its performance. This study established a three dimensional flow field model of a small flow electric fuel gear pump applied in the fuel system of a certain missile aviation engine. The dynamic flow state inside the gear pump was simulated using dynamic mesh technology. The influence of changes in gear radial and axial clearance parameters on the performance of the gear pump was studied, and the calculation results were experimentally verified. Through research, it has been found that the internal clearance size of small flow aviation gear pumps has a significant impact on their performance. Traditional formulas cannot accurately calculate their radial leakage amount, and the results are usually too large; The volumetric efficiency shows a non linear and rapid decrease with the increase of radial and axial clearances; The amplitude of flow pulsation decreases with the increase of axial clearances; For small sized and low flow aviation gear pumps, to ensure their volumetric efficiency, the range of radial and axial clearances should be strictly controlled. This research content has certain guiding significance for the development and production of small flow gear pumps.
Issue:	Vol. 46 No. 2 (2025)
Published:	2025-02-28
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