Research on Influences of High-speed Aviation Gear Pump Clearances on Efficiency

doi:10.3969/j.issn.1004-132X.2026.02.014

Abstract

Abstract:

In order to solve the problems of the effect of high-speed aviation gear pump clearances on the efficiency， a flow field simulation was established and combined with theoretical model analysis to study the effects of different radial and end face clearances on internal leakage and efficiency， as well as to explore the optimal radial and end face clearances at different speeds， and establish multiple groups of orthogonal experiments for verification. The results show that as the speed increases， the optimal end face clearance sizes also increase， and as the speed increases， the effect of the clearance sizes changes on the efficiency of the fuel gear pumps decrease.

Key words: aircraft engine, fuel pump, high-speed gear pump, optimization, clearance, efficiency

摘要：

针对高速航空齿轮泵间隙对效率影响的问题，建立流场仿真并结合理论模型分析，研究了不同径向与端面间隙对内泄漏及效率的影响，探究不同转速下的最佳径向与端面间隙，同时建立了多组正交试验进行验证。研究结果表明：转速增大，最佳端面间隙尺寸也增大，并且伴随转速的提高，间隙尺寸变化对燃油齿轮泵效率的影响变小。

关键词: 航空发动机, 燃油泵, 高速齿轮泵, 优化, 间隙, 效率

CLC Number:

V233.2

ZHANG Longwang, FENG Zhiguo, ZHAO Lei, ZHANG Yu. Research on Influences of High-speed Aviation Gear Pump Clearances on Efficiency[J]. China Mechanical Engineering, 2026, 37(2): 390-397.

张龙望, 冯治国, 赵磊, 张宇. 高速航空齿轮泵间隙对效率影响研究[J]. 中国机械工程, 2026, 37(2): 390-397.

Figures/Tables 20

Fig.1 Structure of high-speed aviation oil pump

Tab.1 Gear parameters of high-speed aviation oil pump

模数m/mm	0.5
齿数Z	12
齿宽B/mm	5.5
齿顶圆半径R_a/mm	3.5
齿轮轴半径R_z/mm	1.0
齿尖宽l_a/mm	0.19
中心距a/mm	6.0
工作转速n/（r·min $- 1$ ）	15 000

Tab.1 Gear parameters of high-speed aviation oil pump

模数m/mm	0.5
齿数Z	12
齿宽B/mm	5.5
齿顶圆半径R_a/mm	3.5
齿轮轴半径R_z/mm	1.0
齿尖宽l_a/mm	0.19
中心距a/mm	6.0
工作转速n/（r·min $- 1$ ）	15 000

Tab.2 Parameters of RP-3 oil and working condition

油液密度ρ/（kg·m $- 3$ ）	780
25 ℃下黏度μ/（Pa·s）	0.000 96
出口输入压差Δp/MPa	0.6

Tab.2 Parameters of RP-3 oil and working condition

油液密度ρ/（kg·m $- 3$ ）	780
25 ℃下黏度μ/（Pa·s）	0.000 96
出口输入压差Δp/MPa	0.6

Fig.2 Oil flow and internal leakage

Fig.3 Gear pump clearance diagram

Fig.4 Fluid state at the radial clearance

Fig.5 Fluid state at end face clearance

Fig.6 Flow field domain and mesh

Fig.7 Cell independence verification

Fig.8 Different end face clearance pressure distribution

Fig.9 Cogging pressure capture

Fig.10 Output flow caused by different clearances

Fig.11 Efficiency caused by different clearances

Fig.12 Simulation of different radial clearances and rotational speeds

Fig.13 Simulation of different end face clearances and rotational speed

Fig.14 Schematic diagram of the experimental flow of aviation gear oil pump

Fig.15 Structure diagram of aviation gear oil pump

Tab.3 Experimental gear data

目标齿轮厚度	实际厚度	实际齿顶圆直径	实际端面间隙	实际径向间隙
5.500	5.502	6.994	0.005	0.022
5.490	5.491	6.995	0.0105	0.0215
5.480	5.480	6.994	0.0155	0.022
5.470	5.471	6.996	0.0205	0.021
5.460	5.462	6.995	0.030	0.0215

Fig.16 Experimental of different end clearances and different speeds

Fig.17 Input torque at different speeds and radial clearance

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