CAJ | 학술논문

在直连式试验台上,采用等截面燃烧室对多个凹腔同侧串联布置的燃烧室的阻力进行了试验研究.分析了凹腔深度分别为10、15和20 mm,凹腔长深比分别为5和7的不同凹腔组合、凹腔顺序、凹腔距离和凹腔数目在不同燃料当量比下的燃烧室内阻.研究结果表明,在同一燃料当量比下,燃烧室内串联凹腔数目越多,阻力越大,单个阻力较大的凹腔组合后总阻力较大;燃料喷射方式和当量比对燃烧室阻力变化规律影响较大,在小当量比时氢气燃烧放热将可能增加燃烧室内阻;相同当量比和燃料喷射方式下,氢气比煤油燃烧时阻力大;在合适的当量比和燃料喷射方式下煤油燃烧时组合凹腔可能产生正推力.
재직련식시험태상,채용등절면연소실대다개요강동측천련포치적연소실적조력진행료시험연구.분석료요강심도분별위10、15화20 mm,요강장심비분별위5화7적불동요강조합、요강순서、요강거리화요강수목재불동연료당량비하적연소실내조.연구결과표명,재동일연료당량비하,연소실내천련요강수목월다,조력월대,단개조력교대적요강조합후총조력교대;연료분사방식화당량비대연소실조력변화규률영향교대,재소당량비시경기연소방열장가능증가연소실내조;상동당량비화연료분사방식하,경기비매유연소시조력대;재합괄적당량비화연료분사방식하매유연소시조합요강가능산생정추력.
The internal drag of cavities in tandem is investigated in a constant area scramjet engine on a direct-connected test stand. Cavities with depths of 10, 15 and 20 mm, and length to depth ratios of 5 and 7 are adopted to investigate the effect on its drag of different combinations, sequences, distances and numbers of cavities with different fuel injection schemes and equivalence ratios. Results reveal that, for a known fuel injection scheme the more cavities are installed in tandem, the higher is the internal drag;combination of cavities with higher drags leads to higher total drag;fuel injection scheme and equivalence ratio have great impact on combustor drag;with low equivalence hydrogen combustion will increase the internal drag;the drag of hydrogen combustion is higher than kerosene combustion with equal equivalence ratio. For certain suitable fuel injection schemes, multi-cavities may also produce a positive force.