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<p>In water-exit projectiles utilizing high-pressure gas ejection, the tail section typically develops a cavity formed by high-pressure gas from the launch tube. The pressure oscillations within this tail cavity significantly influence the projectile’s hydrodynamic load. This paper experimentally investigates the internal pressure oscillation characteristics of the ejection projectile’s tail cavity under varying ventilation conditions and ambient pressures. The research reveals that tail cavity pressure demonstrates periodic pulsation patterns during vertical motion. The primary cause of pressure impact at the projectile’s bottom is attributed to the re-entrant jet formed during cavity closure. Enhanced ventilation and reduced ambient pressure contribute to increased tail cavity volume, which promotes stable projectile motion in water. Additionally, this study establishes the relationship between the tail cavity’s periodic pulsation characteristics and the cavitation number.</p>

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Experimental Study on Pressure Oscillation Characteristics of Water-Exit Projectile Tail Cavity

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Zhao-yu Qu,
  • Gui-hui Ma,
  • Jie Cui,
  • Bin Zhao,
  • Shi-qi Fan

摘要

In water-exit projectiles utilizing high-pressure gas ejection, the tail section typically develops a cavity formed by high-pressure gas from the launch tube. The pressure oscillations within this tail cavity significantly influence the projectile’s hydrodynamic load. This paper experimentally investigates the internal pressure oscillation characteristics of the ejection projectile’s tail cavity under varying ventilation conditions and ambient pressures. The research reveals that tail cavity pressure demonstrates periodic pulsation patterns during vertical motion. The primary cause of pressure impact at the projectile’s bottom is attributed to the re-entrant jet formed during cavity closure. Enhanced ventilation and reduced ambient pressure contribute to increased tail cavity volume, which promotes stable projectile motion in water. Additionally, this study establishes the relationship between the tail cavity’s periodic pulsation characteristics and the cavitation number.