煤油液体射流在高温超声速横流平行背向阶梯腔内的喷射特性

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-23 DOI:10.1016/j.ast.2025.110989

Jiang Chuanjin , Yuan Jiazhou , Wang Peng , Bao Heng , Tian Liang , Zhong Zhan , Nie Wansheng , Tong Yiheng

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引用次数: 0

摘要

实验研究了高焓超声速横流条件下煤油燃料在平行背向阶梯腔燃烧室中的雾化特性。采用高速摄影和纹影法研究了燃烧室构型对侵彻深度、喷雾生存距离和空腔喷雾系数的影响。研究表明，膨胀扇形成的向流压力梯度显著抑制了射流上界的振荡。压缩波和反射波显著增加了射流的穿透深度，最大增幅可达80%。此外，这些波可以将液体射流的生存距离缩短30%。当激波撞击到射流产生的弓形激波上时，射流变得不稳定，发生大幅度振荡。此外，射流的上游存在一个分离区，在那里聚集了大量的液滴。射流振荡是由射流前部的三种激波/激波相互作用引起的。射流因子的振荡是由腔体的自脉动引起的，与剪切层对腔体尾缘的冲击有关。主流区的燃料分布与腔内的燃料分布相关性不强。

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Spray characteristics of a liquid jet of kerosene in a parallel back-facing step cavity in high-temperature supersonic crossflow

The atomization characteristics of kerosene fuel in a parallel back-facing step cavity combustor under high-enthalpy supersonic crossflow were experimentally investigated in this work. High-speed photography and schlieren methods were employed to study the effects of the combustor configuration on the penetration depth, spray survival distance, and cavity spray factor. The study reveals that the streamwise pressure gradient formed by the expansion fan significantly suppresses the oscillation of the upper boundary of the jet. Compression waves and reflected shocks significantly increase the penetration depth of the jet, with the maximum increase reaching 80 %. Additionally, these waves can reduce the survival distance of the liquid jet by up to 30 %. When the shock wave impinges on the bow shock wave generated by the jet, the jet becomes unstable, and large-amplitude oscillations occur. Additionally, a separation zone exists upstream of the jet, where a significant number of droplets accumulate. Jet oscillation results from three types of shock/shock interactions in front of the jet. The oscillation of the spray factor is caused by the cavity’s self-pulsation and is related to the shear layer’s impact on the cavity’s trailing edge. The fuel distribution in the mainstream region is not strongly correlated with that inside the cavity.

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.