| 摘要:对国内外近年关于液态燃料跨/超临界喷射的实验及数值模拟研究进行综述和分析。分析表明:超临界作为一种不可规避的工况，其喷射具有完全不同于亚临界喷射的特性，气液界面消失，液滴和液丝等结构由高密度流体团代替，成为一个由湍流支配的无相变的扩散过程。现有研究多是对跨/超临界喷射现象的观测与描述，对该现象产生的机理及其对燃烧的影响尚不明确。采用传统喷雾模型进行超临界喷射仿真，得到的结果与实验现象有很大误差；采用真实流体状态方程所进行的仿真可大幅减小这个误差，但结果仍不理想。指出:跨/超临界喷射对燃烧稳定性的影响是航空航天领域的研究方向，而内燃机领域则更关注跨/超临界喷射对短暂雾化过程以及燃烧效率的影响。 |
| 关键词: 跨/超临界 液态燃料 喷射 |
|
| Research Development of Liquid Fuel Cross/Supercritical Injection |
| Wang Zhen,Lyu Tian,Pan Weiming,Lan Jian |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 201108;Shanghai Heat Engine Engineering Technology Research Center, Shanghai 201203 |
| Abstract:The experiments and numerical simulations of liquid fuel cross/supercritical injection carried out in recent years are reviewed and analyzed. The analysis result indicates that supercritical conditon as a kind of unavoidable condition, the characteristics of its spraying is completely different from the subcritical spraying. The gas-liquid interface disappeared and the liquid droplets and filaments are replaced by high density liquid mass,forming a diffusion process dominated by turbulence with no phase transition. Previous research was more focused on the observation and description of cross/supercritical spray phenomenon, the detailed mechanism of this phenomenon and its effect on combustion were unclear. The results of spray simulation at supercritical condition using traditional spray model has a great error comparing with the results of the experimental phenomenon. The error can be reduced significantly by using the real fluid equation of state, but the results are still unsatisfactory. Across/supercritical spray effect on combustion stability is the research direction in the field of aerospace, and the field of internal combustion engine is more concerned with cross/supercritical spray for short atomization process and the influence of combustion efficiency. |
| Key words: across/supercritical liquid fuel spray |
