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摘要: 利用挂滴装置和高速摄影系统研究了单元推进剂LP1846液滴在0.2～4.0 MPa、673～973 K工况下的微爆特性。观察到液滴在不同环境压力和温度下的3种微爆模式，即液滴在着火前的轻度破碎、液滴在燃烧时的部分破碎和全部爆碎，并给出了微爆过程的特征照片，定量测试了液滴微爆延迟期、微爆温度和微爆直径与环境压力、温度的关系。初步分析了液滴微爆机理，认为第一种微爆机理主要是水组分的过热，第二、三种微爆机理是液相化学反应。研究结果对控制LP1846燃烧稳定性和指导液体发射药火炮内弹道设计均有参考价值。Abstract: The properties of micro-explosions of monopropellant LP1846 droplets in ambient conditions of 0.2～4.0 MPa, 673～973 K were investigated using a suspended droplet apparatus and a high speed camera. Three modes of micro-explosions, i.e., slight fragmentation of droplets before ignition, part and full fragmentations of droplets during burning period, were observed under different pressure and temperature, and characteristic photographs of droplet micro-explosions were given. Micro-explosion delay time, temperature and diameter of droplets were also measured quantitatively. Droplet micro-explosion mechanisms were analyzed primarily. It is suggested that the mechanisms of the three modes are the overheating of water component for the first mode, and liquid phase reactions, respectively. The results are of reference value to control combustion stability of LP1846 and design interior ballistics of regenerative liquid propellant guns.
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Key words:
- droplet microexplosion /
- droplet combustion /
- liquid propellant /
- liquid propellant gun
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