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| Trajectory Model of High-speed Water Entry of the Body of Revolution |
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| DOI：10.7643/issn.1672-9242.2022.05.004 |
| KeyWord:body of revolution high speed water entry ballistic model cavitation characteristics ballistic character |
| Author | Institution |
| JIAO Wei-peng |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
| HUANG Zhen-gui |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
| CHEN Zhi-hua |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
| LIU Xiang-yan |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
| WANG Hao |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
| ZHOU Ke |
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| This paper aims to predict rapidly the development of cavitation shape of the body of revolution in the process of high-speed water entry and to analyze the ballistic characteristics of the body of revolution after high-speed water entry. Based on the principle of independent expansion of cavitation section, the calculation method of unsteady supercavitation of the body of revolution water entry at high speed was established. The motion parameters of the body of revolution were solved by high-speed hydrodynamic calculation method combined with the dynamic equation of body of revolution. By comparing with the experimental results in literature, the reliability of the calculation model of high-speed water entry trajectory of body of revolution was verified. Compared with the experimental results, the prediction error of the model is less than 10%, which meets the needs of high-speed water entry trajectory prediction of body of revolution. The changes in cavitation shape and motion parameters of body of revolution under two working conditions of high-speed vertical and inclined water entry were calculated. It was found that in the process of high-speed water entry, cavitation will affect the movement of body of revolution, and the velocity attenuation of body of revolution is mainly related to the resistance of the cavitation. After body of revolution was affected by the disturbance angular velocity, the sliding force will change the pitching angle and angle of attack of body of revolution, and bend the trajectory, but it can help to stabilize the movement of body of revolution. If the water entry cavity can completely wrap the rotating body, the structure of body of revolution can be optimized, and the stability of the high-speed water entry movement of body of revolution can be improved by enhancing the sliding force in the tail beat movement of body of revolution; properly reducing the diameter of the cavitation can reduce the resistance of body of revolution in the process of entering the water and increase the range. |
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