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| Characteristics of Gas After-effect Flow Field of Underwater Artillery |
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| DOI：10.7643/issn.1672-9242.2022.05.002 |
| KeyWord:supercavitating projectile underwater firing artillery gas bubble cavitation characteristics pressure pulsation |
| Author | Institution |
| QI Xiao-bin |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
| LI Rui-jie |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
| FAN Ping |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
| GU Yu-tao |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
| MIAO Pu |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
| WANG Rui |
Northwest Institute of Mechanical & Electrical Engineering, Shaanxi Xianyang , China |
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| Abstract: |
| This paper aims to study the after-effect of muzzle gas and its influence on the supercavitating flow field of high-speed projectile during Artillery underwater firing. Considering the cavitation model, based on the CFD software FLUENT, the technology of UDF and dynamic mesh was used to establish the numerical calculation model of multiphase flow of gas in the muzzle of underwater Artillery. The numerical simulation is carried out aiming at the aftereffect movement of underwater Artillery muzzle under the condition of 1m water depth, the development characteristics of muzzle bubbles and the law of pressure fluctuation are obtained, the influence of muzzle bubble on the development of cavitation in high-speed projectile is analyzed. The muzzle bubble has experienced the development process of expansion, contraction, and rupture, and can accelerate the projectile movement in the early stage of development. The pressure characteristics at the center of the jet are the most complex, with increasing the distance from the jet center, pulsation amplitude decreases. At the initial stage of high-speed projectile entering the water, supercavitation is rapidly formed, and then the gas bubble and cavitation develop and integrate, and the high-pressure gas enters the formed gas/vapor mixed cavity, which inhibits the development of cavition, a closed cavity is formed when projectile moves five times the spring length. Compared with the underwater firing experiment of artillery, the accuracy of the simulation model is verified, and the cavition simulation results are in good agreement with the experiment. The complex flow field of underwater firing will not only after the development of high-speed projectile cavitation, but also make the artillery platform endure the threat of high load impact, so it is necessary to take muzzle load reduction measures |
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