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| Impact of Nozzle Structure on Deceleration of Vehicles during Water Entry with Gas Ejection |
| Received:December 24, 2024 Revised:February 09, 2025 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2025.03.002 |
| KeyWord:trans-media vehicle high-speed water entry impact load nose jet multiphase flow load control nozzle structure |
| Author | Institution |
| HOU Jie |
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Hunan Xiangtan , China;College of Aerospace Science, National University of Defense Technology, Changsha , China |
| FENG Heying |
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Hunan Xiangtan , China |
| XIANG Min |
College of Aerospace Science, National University of Defense Technology, Changsha , China |
| PENG Yehui |
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Hunan Xiangtan , China |
| FANG Ling |
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Hunan Xiangtan , China |
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| Abstract: |
| The work aims to investigate the efficacy of nose jet deceleration methods for trans-medium vehicles during high-speed water entry and to optimize the nozzle structure to mitigate the risk of damage to internal and external components of the vehicles.To explore nozzle configurations with superior deceleration effects, based onthe Volume of Fluid (VOF) multiphase flow model and the Realizable k-ε turbulence model, the impact of equal diameter, convergent, and divergent nozzles on the deceleration performance during jet water entry was studied. By integrating the advantages of various nozzle types for nozzle modification and optimizing the structural design of deceleration, the optimal Laval nozzle structural parameters with the best load reduction effect were ultimately obtained.The results showed that the deceleration effect of the vehicle's nose jet deceleration method was found to increase with the enlargement of the nozzle diameter. However, beyond a certain size, further increasing the nozzle diameter did not enhance the axial thrust of the jet, yielding diminishing returns in deceleration performance. Convergent and divergent nozzles were constrained by outlet flow rate and nozzle shock waves, respectively, leading to inferior deceleration effects compared with equal-diameter nozzles. The Laval nozzle design, which combined the advantages of equal diameter, convergent, and divergent nozzles while avoiding their drawbacks, significantly influenced the jet performance and deceleration effect, achieving a deceleration rate of 71.01%, which was a 4.84% improvement over the equal diameter nozzle under the same conditions.It is concluded thatnose jet water entry is an effective active deceleration method, and the nozzle structure significantly impacts the deceleration effect. The Laval nozzle design, due to its comprehensive advantages, demonstrates the best deceleration performance and can effectively enhance the safety and reliability of the trans-medium vehicle. |
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