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Outline
Aiming at the problem of seal failure caused by thermal deformation of an aero‑engine fuel pump under extreme conditions such as high temperature and high speed，this study establishes a thermal-fluid-solid interaction model for an upstream pumping mechanical seal based on the mechanical seal structure of an afterburner fuel pump.Professional computational fluid dynamics software and a thermal-fluid-solid coupling platform are employed to calculate the stress and strain on the seal rings under extreme conditions.The influences of varying operating parameters—rotational speeds ranging from 20 000 to 40 000 r/min and pressure differences from 0.5 to 9 MPa—on the stress and strain of the mechanical seal rings are analyzed.Results indicate that when the liquid film thickness on the seal face is 2 μm，the spiral groove depth is 6 μm，the number of grooves is 12，and the spiral angle is 18°（serving as baseline parameters），both the dynamic and static seal rings experience measurable stress and strain as the rotational speed increases.Notably，the maximum stress and deformation of the dynamic ring exceed those of the static ring，with the maximum deformation difference between the two rings reaching 2.5 μm.As the sealing pressure difference increases，the stress and strain values of the seal rings increase linearly.However，the seal rings exhibit low sensitivity to pressure changes：for every 1 MPa increase in pressure difference，the strain increases by approximately 0.02 μm，and the maximum stress increases by approximately 0.3 MPa.Under all tested operating conditions，the seal rings generate corresponding stress and strain.Therefore，during the design and calculation processes，the impact of these stresses and strains on overall sealing performance must not be overlooked.The research results can provide valuable references for multi‑physical field coupling calculations of upstream pumping mechanical seals under extreme conditions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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