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The transition of the boundary layer from laminar to turbulent flow significantly impacts the flight stability and safety of aircraft. The aerodynamic heating of the nose of the hypersonic vehicle during flight increases the nose temperature, which affects the stability and transition characteristics of the boundary layer. In this paper, experiments were carried out using a Mach 6, 0° angle of attack conical model to explore the influence of the nose temperature and bluntness on the stability of the conical boundary layer. The wall temperature ratio (the ratio of the nose temperature to the total incoming temperature) Tw/T0 varies between 0.6 and 1.3, while the nose bluntness R ranges from 0 to 5 mm. Measurements of boundary layer transition and unstable wave were carried out utilizing infrared thermal imaging and high frequency pulsating pressure sensor (PCB). The experimental results show that changing the nose temperature and bluntness affects boundary layer stability. For a sharp cone (R < 50 μm), the nose heating promotes the development of the second mode wave. However, for R = 0.5 mm and 2 mm cones, increasing Tw/T0 from 0.6 to 1.1 inhibits the development of the second mode wave, while a further increase to 1.3 encourages it. For R = 5 mm cones, nose heating stabilizes the second mode wave.
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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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