Effects of capsule wake on parachute working performance

WU Zhuoheng; YU Li; ZHAO Xiaoshun; NIE Shunchen

doi:10.13700/j.bh.1001-5965.2020.0465

Volume 47 Issue 12

Dec. 2021

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Journal of Beijing University of Aeronautics and Astronautics > 2021 > 47(12): 2552-2559.

CHEN Tiantian, ZHAO Gang. Tool path generation for Loop subdivision surface based finish machining[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(4): 663-668. doi: 10.13700/j.bh.1001-5965.2014.0308(in Chinese)

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WU Zhuoheng, YU Li, ZHAO Xiaoshun, et al. Effects of capsule wake on parachute working performance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2552-2559. doi: 10.13700/j.bh.1001-5965.2020.0465(in Chinese)

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Effects of capsule wake on parachute working performance

doi: 10.13700/j.bh.1001-5965.2020.0465

1.
Key Laboratory of Aircraft Enviroment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2.
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Funds:

National Natural Science Foundation of China 11972192

More Information

Corresponding author: YU Li, E-mail: yuli_happy@nuaa.edu.cn
Received Date: 26 Aug 2020
Accepted Date: 06 Nov 2020
Publish Date: 20 Dec 2021

Abstract

Abstract

To study the unsteady effects of capsule wake on parachute aerodynamic performance, the Realizable k-ε turbulence model and PISO algorithm are used to calculate the unsteady flow around the capsule-parachute system, and an accurate flow field vortex structure is obtained. The research on the variation of vortex, the flow field distribution and the aerodynamic characteristics of the canopy at different trailing distances has been carried out. The results show that the vortex of capsule wake causes the magnitude and direction of the vorticity at the entrance of the canopy to change constantly. As the trailing distance increases, the vorticity magnitude gradually decreases because of the increase of the vorticity's viscous dissipation, and a stable negative vortex area is formed at the entrance of the canopy. The canopy vortex's escape period is extended. The trailing distance has a much greater influence on the flow field pressure at the entrance of the canopy than at capsule. As this distance increases, the flow form gradually changes from closed to open, the velocity and pressure distribution of the flow field become more symmetrical, and a stable positive pressure zone is formed. The internal and external pressure difference increases. The influence of the capsule wake on the drag coefficient and surface pressure coefficient of the canopy is reduced when drag ratio equals or greater than 9.
- capsule wake,
- parachute,
- flow field distribution,
- variation of wake vortex,
- aerodynamic characteristics

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References

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