液态燃料在高速燃烧过程中的雾化、蒸发和燃烧是目前国内外新型发动机中企待解决的关键性问题，虽经过多年的努力，但是至今没有取得突破性进展。本项目期望克服可压缩气流中液滴破碎相关理论模型的不足，以理论、数值方法与实验验证构建燃料液滴在可压缩气流中破碎机理的新理论。理论方面，拟针对液滴在可压缩流中的线性不稳定性进行分析，阐明不同液滴物性（密度、粘性、表面张力）及初始尺寸、气流温度与马赫数对最不稳定波长的影响，为建立破碎模型提供理论依据。同时参考最新的国内外液滴破碎的实验结果，提出一简化的实用模型；数值方面拟建立最新时空守恒元/解元（CE/SE）数值模拟平台，开展液滴在可压缩气流中的破碎、蒸发和燃烧特性研究；实验方面则将建立一闪沸雾化的液态燃料爆轰管，进行理论与数值方法检验。预期成果有望提升现有液态燃料在高速燃烧问题的理论水平，并为发展有效的应用技术提供科学依据，因此，具有重要的科学价值和应用前景。

The fragmentation, vaporization and combustion of liquid fuels in high-speed flows pose the key technological threshold in the development of new generation engines for hypersonic vehicles domestically and internationally. Although many years of efforts have been made in the academia and industries, no significant breakthrough has been done. In order to enhance the applicability of the existing theories, in this project, combined endeavors of theoretical derivation, numerical simulation and experimental verification will be launched to build a modern theory of the fragmentation, vaporization and combustion of liquid fuels in high-speed flows. In the theoretical derivation aspect, Rayleigh-Taylor and Kelvin-Helmholtz linear instability analyses on the fuel droplets in the compressible gas flow will be conducted to elucidate the effects of fuel properties (such as density, viscosity and surface tension), initial droplet dimensions, free-stream temperature, and Mach number on the critical wavelength. The derived theory will form the cornerstone of the new theory of the fragmentation, vaporization and combustion to be built; meanwhile, contemporary domestic and international experimental results will be searched and put together, with the input of the derived theoretical results, to correlate a simplified and applicable model for the following numerical simulations and future engineering applications. In the numerical simulation aspect, the novel CE/SE algorithm will be developed as the platform for exploring the characteristics of fragmentation, vaporization and combustion of liquid fuels in high-speed flows and for supporting the theory development. In the experimental efforts, a detonation tube using flashing boiling atomized liquid fuels will be designed and built to validate the model and numerical method developed. The outcome of the project will contribute to the existing knowledge on the fragmentation, vaporization and combustion of liquid fuels in high-speed flows and lay down a solid scientific foundation for its future exploration. The project is deemed to have significant scientific value and great potential for future engineering applications.