液氧/甲烷同轴喷雾及火焰稳定的试验

介绍了液氧和气态甲烷的低温同轴喷雾燃烧试验,试验使用了光学诊断方法如阴影法和火焰分光光谱法记录了试验中的喷雾和火焰信息,讨论了不同燃烧室压力和喷注无量纲数如韦伯数(We)和气液动量流率比下的雾化和火焰稳定情况。试验结果表明,燃烧室压力对射流雾化和火焰稳定有显著影响,增加燃烧室压力有利于火焰稳定于靠近喷注器面的地方,研究中没有发现火焰吹离距离和韦伯数之间有明显的关系式。液氧射流核心长度随气液动量流率比的增大而下降。雾化质量对液氧/甲烷同轴喷雾的火焰稳定性有明显的影响。

Experimental investigation of liquid oxygen/CH4 coaxial spray and flame stabilization

Experimental investigation of cryogenic reactive coaxial sprays with liquid oxygen as oxidizer and gaseous methane as fuel was conducted in DLR Lampoldshausen, Germany. The sprays and the flames were investigated by visualization methods such as shadowgraphy and imaging the flame emission. The atomization and flame stabilization at different chamber pressures and injection dimensionless numbers, such as Weber number (We) and momentum flux ratio J-number, are discussed. It is shown that combustion pressure affects the jet atomisation appearance and the flame stabilization significantly. Increasing chamber pressure favors the flame anchoring close to the injection plane. No correlation between flame liftoff distance and Weber number or injection velocity has been found in this study. The liquid oxygen intact core length decreases with increasing gase-to-liquid momentum flux ratio. Atomization has significant effect on LOX/CH4coaxial flame stabilization.