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Outline
This study addresses the high-temperature sealing challenges in aero-engines by analyzing the effects of wall thickness， compression ratio， and cyclic compression cycles on the elastic performance of U-shaped metal seals. The optimal parameter combination is determined through systematic investigation. Additionally， a dedicated high-temperature gas tightness testing apparatus is developed to evaluate airtight performance， with a derived leakage rate calculation formula providing quantitative analysis. The results demonstrate that the elastic recovery rate decreases with increased wall thickness， higher compression ratios， or greater numbers of compression cycles. At 650 ℃， all three tested wall thicknesses maintain over 90% recovery rate after 50 compression cycles， with the 0.5 mm configuration showing superior elastic characteristics. Leakage rate exhibits negative correlation with temperature and contact stress， while displaying positive linear dependence on pressure differentials. Notably， the 0.5 mm seal achieves 50% lower leakage at 650 ℃ compared to room temperature. Enhanced wall thickness or compression ratio improves airtightness by elevating interfacial contact stress.
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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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