激波/膨胀波对超音速空腔超临界煤油点火燃烧特性的影响

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-30 DOI:10.1016/j.ast.2025.111021

Kai Yang, Fei Li, Linshan Jiang, Yihang Li, Tao Jiang, Ning Wang, Yu Pan, Taotao Zhan

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引用次数: 0

摘要

激波和膨胀波是超声速燃烧室中典型的流动结构，它们直接影响燃油的混合和化学反应过程，特别是对于具有独特蒸发和混合特性的超临界煤油。基于直连式发动机实验平台，在马赫数2.52、总温度1486 K、总压1.6 MPa的来流条件下，研究了激波/膨胀波对超临界煤油点火和燃烧特性的影响。实验结果表明，由激波和楔块引起的膨胀波组成的三波结构对煤油点火有显著影响。由于燃油蒸发和混合特性的差异，中间楔形产生的膨胀波压缩腔体再循环区，导致超临界煤油点火失败，而上游楔形产生的激波使射流尾迹升高，导致液体煤油点火失败。在火焰稳定后，激波强度明显减小，楔形在亚音速燃烧场中的主要作用是压缩和阻塞流道，对燃烧的影响有限。

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Effect of shock/expansion wave on ignition and combustion characteristics of supercritical kerosene with cavity in supersonic flow

Shock wave and expansion wave are typical flow structures in supersonic combustion chamber, which have a direct effect on the fuel mixing and chemical reaction process, especially for supercritical kerosene with unique characteristics of evaporation and mixing. Based on the experimental platform of a direct-connected model engine, the effects of shock/expansion wave on the ignition and combustion characteristics of supercritical kerosene were investigated under the conditions of incoming-flow with Mach number 2.52, total temperature 1486 K and total pressure 1.6 MPa. The experimental results show that the triple-wave structure consist of shock waves and expansion wave induced by wedge has a significant effect on kerosene ignition. Due to the difference in fuel evaporation and mixing characteristics, the expansion wave generated on the middle wedge compresses the recirculation zone of the cavity, leading to the failure of supercritical kerosene ignition, while the shock wave generated on the upstream wedge elevates the jet wake, leading to the ignition failure of liquid kerosene. After the flame is stabilized, the intensity of the shock wave decreases significantly, and the main effect of the wedge in subsonic combustion field is to constrict and choke the flow path, which has a limited effect on the combustion.

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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.