激波激励下燃料液滴二次雾化过程及爆轰诱导机制

Secondary Atomization can significantly improve the breakage extend of liquid droplets, as well as their mixing effect with oxidizers. Based on advanced secondary atomization technique, detonation damage efficiency of FAE (Fuel-Air Explosive), of which the main components are liquid fuels, can be greatly enhanced. In this project, three kinds of typical liquid fuels that frequently used in FAE are chosen; their secondary atomization processes as well as the detonation mechanism are systematically investigated. First, secondary atomization characteristics of liquid fuel droplets under the effect of shock waves is studied, to illustrate the quantitative indexes of atomization degree and the main controlling parameters for the optimization of secondary atomization. Based on the above work, an optimization technique for secondary atomization is then established. Second, based on high-speed laser visualization technology, the interface instability in interaction process between shock wave and liquid droplets is captured, to reveal the mechanism of instability generation. Furthermore, flow field mixing mechanism in this interaction is studied. By performing the above investigations, the mechanisms regarding hot spot formation, development of detonation from secondary atomization characteristics, interface instability features and flow field mixing features are deeply studied to reveal the initiation and propagation mechanism of detonation in liquid fuels that caused by shock waves. Research results of this project can improve the understanding of optimization secondary atomization for fuel droplets and the detonation mechanism in liquid fuel mixtures, which can provide scientific evidences to develop advanced FAE weapons and fuel cloud controlling technology.

二次雾化可显著增加燃料液滴的破碎程度，增强液滴与氧化剂的混合，基于燃料液滴二次雾化优化技术可极大提升云雾弹药的爆轰毁伤效率。本项目遴选出云爆弹药中3种典型液态燃料，系统开展激波激励下燃料液滴二次雾化过程以及爆轰诱导机制的研究。首先研究各燃料液滴在激波作用下二次雾化过程的特征，提炼出表征雾化程度的定量化指标，揭示优化二次雾化的主控参数，从而建立燃料液滴二次雾化的优化技术；其次基于高速激光可视化技术，精确捕捉激波与液滴相互作用过程中界面失稳过程和不稳定性产生机制，从而揭示激波与燃料液滴作用过程中流场混合机制；在上述基础上，进一步研究二次雾化表征、界面失稳特征、流场混合特征对于混合物热点形成、爆轰形成和发展规律的影响机制，从而揭示激波对燃料液滴爆轰诱导的激励机制。研究结果可加深和拓宽对燃料液滴二次雾化优化机理与云雾爆轰诱导机制的理解，为发展先进的云雾爆轰武器和云雾爆轰控制技术提供科学依据。

二次雾化可显著增加燃料液滴的破碎程度，增强液滴与氧化剂的混合，基于燃料液滴二次雾化优化技术可极大提升云雾弹药的爆轰毁伤效率。本项目遴选出云爆弹药中3种典型液态燃料，系统开展激波激励下燃料液滴二次雾化过程以及爆轰诱导机制的研究。本项目借助试验研究、理论分析和数值模拟，对燃料液滴在激波作用下的二次雾化特性及其爆轰诱导机制进行了系统研究，建立了燃料液滴二次雾化的优化技术，揭示了复杂激波与燃料液滴作用过程中的流场混合机制，明晰了激波对燃料液滴爆轰诱导的激励机制。本研究可为提升云爆弹药的爆轰性能提供科学依据。项目成果在本领域著名期刊发表论文13篇，其中SCI论文9篇，EI 2篇，中文核心2篇，包括国际危险材料领域权威期刊Journal of Hazardous Materials 1篇、国际流体力学领域顶级期刊Physics of Fluid 1篇、国际过程安全与环境领域知名期刊Process Safety and Environmental Protection 1篇、国际物理学领域知名期刊Chinese Physics B和Acta Physica Sinica各1篇、国际燃烧领域知名期刊Combustion Science and Technology 1篇，培养博士研究生1名、硕士研究生1名。