ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (2): 623937-623937.

• Special Topic of Aerodynamic Design of Advanced Space Transportation Sytem •

### Transpiration cooling of nose-cone with forward-facing cavity: Numerical simulation

LUAN Yun, HE Fei, WANG Jianhua

1. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
• Received:2020-03-05 Revised:2020-04-17 Published:2020-05-11
• Supported by:
National Natural Science Foundation of China (51806206)

Abstract: The thermal protection system of sharp nose-cones is an important subject in the investigation of reusable spacecraft. Transpiration cooling, with an ability to effectively reduce the temperature of the nose-cone, has been widely recognized as a promising thermal protection approach. However, the cooling effect at the stagnation point remains poor due to the extremely high heat flux and pressure there. The nose-cone with forward-facing cavity is a drag and heat reduction structure specifically designed for the stagnation region. It can reduce the heat flux and pressure there with the shutting effect of the sharp lip. Therefore, a new combined cooling structure is proposed in this paper: transpiration cooling with forward-facing cavity. It utilizes the cooling enhancement effect of the forward-facing cavity to solve the problem of low cooling efficiency at the stagnation region. Using a wedge-shaped nose cone as the physical model, the cooling performance of three structures, i.e., transpiration cooling, forward-facing cavity and transpiration cooling with the cavity, is studied and compared. The simulation results indicate that, using the new combined cooling structure, the maximum temperature of the nose-cone can be reduced by 16.8% compared with that of the traditional transpiration cooling, and the average circular surface temperature can drop by 64% compared with that on the pure nose-cone, confirming the feasibility and high efficiency of the new cooling structure.

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