高速高压燃油齿轮泵典型卸荷槽对比分析

doi:10.7527/S1000-6893.2023.29666

Abstract

Abstract:

The relief groove is the most effective measure to alleviate oil trapping of gear pumps； therefore， its design directly affects the working efficiency and service life of the gear pump. This paper presents a performance analysis method for relief grooves based on computational fluid dynamics. A comparative study was conducted to evaluate the performance of different structural forms of relief grooves， focusing on technical indicators such as trapped oil pressure， gas volume fraction， outlet flow rate， and the flow rate non-uniformity coefficient. The results show that the relief groove F， with a flow non-uniformity of only 5.25% and a trapped oil pressure peak of 18 MPa， outperforms the rectangular， circular， and unloading slot E in terms of overall performance， exhibiting advantages of low trapped oil pressure， high volumetric efficiency， and high flow quality. These characteristics make it well-suited for the design of high-speed and high-pressure fuel gear pumps. In addition， increasing the size of the relief groove and positioning it towards the low-pressure chamber can reduce cavitation， oil entrapment， and flow pulsation. Designing the new unloading slot F with these factors in mind can improve its overall performance.

Key words: aeroengines, fuel gear pumps, relief grooves, trapped oil, cavitation

CLC Number:

V233.22

Guoning QI, Baohai WU, Jiangfeng FU. Comparative analysis on relief grooves of high-speed and high-pressure aeroengine fuel gear pumps[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(5): 529666.

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卸荷槽命名	类型
卸荷槽A	对称布置的矩形卸荷槽
卸荷槽B	向低压侧偏移的矩形卸荷槽
卸荷槽C	对称布置的圆形卸荷槽
卸荷槽D	向低压侧偏移的圆形卸荷槽
卸荷槽E	改进型卸荷槽（一）
卸荷槽F	改进型卸荷槽（二）

卸荷槽类型	卸荷槽A	卸荷槽B	卸荷槽C	卸荷槽D	卸荷槽E	卸荷槽F
压力最大值/MPa	18.6	17.4	25.4	19.7	21.1	19.1
压力最小值/kPa	1.61	1.61	1.65	1.61	1.64	1.60
压力平均值/MPa	5.03	4.21	5.99	4.93	6.17	3.81

卸荷槽类型	流量最大值/（kg·s^-1）	流量最小值/（kg·s^-1）	流量平均值/（kg·s^-1）	供油量不均匀系数/%
卸荷槽A	5.555 56	4.945 49	5.259 7	11.60
卸荷槽B	5.498 99	5.139 37	5.300 5	6.78
卸荷槽C	5.706 62	4.738 98	5.215 1	18.55
卸荷槽D	5.552 68	4.909 87	5.258 3	12.22
卸荷槽E	5.748 75	4.558 65	5.236 0	22.73
卸荷槽F	5.482 81	5.204 60	5.304 2	5.25

卸荷槽类型	优点	缺点
卸荷槽A	结构简单，容积效率高	空化严重，困油压力大
卸荷槽B	结构简单，容积效率较高，困油压力较小	空化严重较严重
卸荷槽C	结构简单，容积效率较高	空化严重，困油压力大
卸荷槽D	结构简单，容积效率高	空化严重，困油压力较大
卸荷槽E	空化轻微，困油压力较小	流量品质低，结构较复杂
卸荷槽F	困油压力小，容积效率高，流量品质高	空化一般，结构复杂

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Comparative analysis on relief grooves of high-speed and high-pressure aeroengine fuel gear pumps

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