固体火箭技术2026，Vol.49Issue(4)：605-621,17.DOI:10.7673/j.issn.1006-2793.2026.04.014
高温燃气来流环境下高速水射流相变特性仿真研究
Numerical study on phase change characteristics of high-speed water jet under high-temperature gas inflow environment
摘要
Abstract
The phase-change characteristics of liquid water jets are of great significance for the efficient water-fuel combustion in water ramjet engines.To investigate the dispersion and phase-change behavior of liquid water jets under high-temperature incoming gas,a three-dimensional transient multiphase-flow computational model was established by adopting the VOF multiphase-flow model coupled with the Lee phase-change model.The effects of nozzle configuration(straight,convergent,and convergent-divergent),incoming gas temperature(600 K,800 K,and 1 000 K),and the distance between the water nozzle outlet and the gas inlet(80 mm,100 mm,and 150 mm)on water-jet characteristics were simulated and analyzed.The results show that the convergent nozzle generates a more stable and concentrated water jet.Through the jet aggregation effect,it suppresses radial dispersion during the phase-change process and achieves more uniform mixing between phase-change-generated water vapor and gas flow.As the incoming gas temperature rises from 600 K to 1 000 K,the water phase-change rate accelerates,the dispersion of both liquid water and water vapor is significantly enhanced,and the radial distribution uniformity of the phase-change-produced water vapor is markedly improved.The diffusion range expands from 22 mm to 35 mm,the mixing performance between the multiphase water jet and gas flow is improved,and the proportion of high-mixing-degree regions increases from 11%to 23%.There exists an optimal distance between the jet outlet and the gas inlet.At a distance of 100 mm,compared with distances of 80 mm and 150 mm,the water jet achieves superior dispersion and a moderate heat-exchange duration,leading to more effective mixing between the phase-change-generated water vapor and the high-temperature gas.The convergent nozzle controls the phase-change boundary mainly by preserving jet-core momentum,whereas elevated incoming-gas temperature accelerates water vaporization rate via interphase heat transfer.A proper injection distance facilitates the coupling of penetration,vaporization,and entrainment diffusion,thereby strengthening the phase-change effect of the water jet.关键词
水冲压发动机/喷嘴构型/多相流/水射流相变/掺混效果Key words
water ramjet engine/nozzle structure/multiphase flow/phase transition of water jet/mixing effect分类
航空航天引用本文复制引用
段懿凡,王印,刘殊远,院博阳,韩陆洋,胡松启..高温燃气来流环境下高速水射流相变特性仿真研究[J].固体火箭技术,2026,49(4):605-621,17.基金项目
固体推进全国重点实验室基金资助项目(D5150240029). （D5150240029）
