摘要
燃料喷射中的自激振荡是诱发燃烧不稳定的重要原因,超临界态燃料“类气体”的性质使其自激振荡对油气混合及燃烧有更显著的影响。为探明超临界煤油自激振荡产生的原因并寻找抑制方法,对超临界煤油射流在旋流流场中的自激振荡特性进行了研究。利用本征正交分解,采用高速纹影技术对不同伴流条件、缩进比和气-液面积比下的超临界煤油喷射过程进行了研究。结果表明:自激振荡的振荡模式为轴向振荡和径向振荡,伴流气体会影响自激振荡区域。气-液面积比为674时,自激振荡的诱因为油-伴流气相互作用,随缩进比减小,自激振荡减弱;气-液面积比为416及178时,自激振荡的诱因为伴流气-环境相互作用,且随缩进比减小,自激振荡增强。
Self-pulsation in fuel injection is an important cause of combustion instability,and the"gas-like"nature of supercritical fuel makes its self-pulsation yield a more significant effect on oil-gas mixing and combustion.The self-pulsation of supercritical kerosene jets in the rotating flow field was investigated to find out the causes of the self-pulsation and the ways to suppress it.The supercritical kerosene injection processes under different companion flow conditions,recess ratios,and gas-liquid area ratios were investigated by using a high-speed schlieren technique using the proper orthogonal decomposition.The results showed that the oscillation modes of self-pulsation were represented by axial and radial oscillations,and the accompanying gas affected the self-pulsation region.When the gas-liquid area ratio was 674,the cause of self-pulsation was oil-associated gas interaction,and the self-pulsation decreased with the decrease of the recess ratio;when the gas-liquid area ratio was 416 and 178,the cause of self-pulsation was associated gas-environment interaction,and the self-pulsation increased with the decrease of the recess ratio.
作者
史鹏宇
张启斌
王之声
任利时
于倩倩
范玮
SHI Pengyu;ZHANG Qibin;WANG Zhisheng;REN Lishi;YU Qianqian;FAN Wei(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China;Shaanxi Key Laboratory of Thermal Sciences in Aero-engine System,Northwestern Polytechnical University,Xi’an 710129,China)
出处
《航空动力学报》
北大核心
2025年第3期54-65,共12页
Journal of Aerospace Power
基金
国家科技重大专项(2017-Ⅲ-0005-0030)。
关键词
超临界态燃料
喷射
本征正交分解(POD)
自激振荡
纹影技术
supercritical fuels
injection
proper orthogonal decomposition(POD)
self-pulsation
schlieren techniques
