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The performance of staged combustion cycle engines is affected by various uncertain factors, where even minor disturbances may cause the engine's operating conditions to deviate from the designed parameters, compromising system stability. To investigate the influence of uncertain factors (e.g., manufacturing tolerances, turbine and pump performance) on the performance of staged combustion cycle engines, 120-ton LOX/kerosene engine is selected as the research object. A combined approach of single-factor sensitivity screening and Monte Carlo-based multi-factor coupled sensitivity analysis is employed to assess the impact of these disturbances. The results indicate that volume-related factors (e.g., gas generator and thrust chamber) have negligible effects on engine system performance. In contrast, turbine efficiency and nozzle diameter exhibit moderate influence. Under multi-factor coupling conditions, the impact of nozzle diameter on system performance parameters is relatively minor, whereas the turbine stator flow area significantly affects gas generator chamber pressure. Additionally, turbine efficiency and the pump heads of both fuel and oxidizer pumps also influence system performance parameters, albeit with distinct patterns. These findings demonstrate that the combined single-factor/multi-factor sensitivity analysis method provides valuable engineering guidance. Special attention should be paid during design and manufacturing to critical factors such as turbine stator flow area and turbopump efficiency.
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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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