Investigation of combustion mode conversion driven by fuel flow variation in a cavity-based scramjet

被引:0
|
作者
Li, Le [1 ]
Wan, Minggang [1 ]
Sun, Mingbo [1 ]
Tian, Yifu [1 ]
Zhu, Jiajian [1 ]
机构
[1] Natl Univ Def Technol, Hyperson Technol Lab, Changsha, Peoples R China
基金
中国国家自然科学基金;
关键词
SUPERSONIC COMBUSTOR; TRANSITION; IGNITION; MECHANISMS; STABILITY; LIMITS; TRAIN;
D O I
10.1063/5.0228771
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This work aimed to investigate combustion mode conversions by rapid variation of the fuel flow rate in a cavity-based scramjet combustor. The experiments were carried out on a direct-connected facility with an inflow condition of Mach number 2.52, a total pressure of 1.35 MPa, and a total temperature of 1650 K. The fuel injector consisted of two injection ports: fuel was continuously injected from one port while the other controlled the fuel flow for mode conversions by switching it on or off. Simultaneous schlieren and CH* imaging techniques were used to characterize the dynamics of combustion mode conversions. It was recognized that the combustion modes characterized by different flow field structures and heat release distributions can be classified into three types: the shear-layer mode, the transition mode, and the jet-wake mode. During the combustion mode conversion, the mixing region of the transverse jet and air became thicker with the increase in fuel flow rate, and the gradient of the flow field density and the flame area increased, making the flame more likely to propagate upstream. The combustion suppression induced by rapid fuel addition was observed at low equivalence ratios. It was speculated that the weak heat supply was insufficient to provide adequate heat for the rapid ignition of the added fuel. Furthermore, it was found that the flame-flow matching process with frequent flame propagation upstream occurred during the combustion mode conversion. This process was attributed to the mismatch between the increasing heat release and the original flow field structure.
引用
收藏
页数:14
相关论文
共 50 条
  • [31] Preliminary investigation of paraffin-based fuel combustion in solid fuel scramjet
    Zhang, Hao
    Wang, Ningfei
    Wu, Zhiwen
    Fang, Guanlin
    Wei, Zhijun
    ACTA ASTRONAUTICA, 2020, 173 : 119 - 130
  • [32] Experimental study of hysteresis and catastrophe in a cavity-based scramjet combustor
    Xu ZHANG
    Qifan ZHANG
    Zhenjie WU
    Lianjie YUE
    Zhanbiao GAO
    Weihang LUO
    Hao CHEN
    Chinese Journal of Aeronautics , 2022, (10) : 118 - 133
  • [33] Large-Eddy Simulation of Supersonic Combustion in a Mach 2 Cavity-Based Model Scramjet Combustor
    Fureby, C.
    Nilsson, T.
    Peterson, D. M.
    Ombrello, T. M.
    Eklund, D.
    AIAA SCITECH 2024 FORUM, 2024,
  • [34] NUMERICAL INVESTIGATION ON THE INFLOW MACH NUMBER VARIATIONS IN A STRUT INJECTED CAVITY-BASED SCRAMJET COMBUSTORS
    Rajesh, A. C.
    Jeyakumar, S.
    Jayaraman, K.
    Karaca, Mehmet
    INTERNATIONAL JOURNAL OF FLUID MECHANICS RESEARCH, 2025, 52 (01)
  • [35] Mixing and combustion studies using cavity-based flameholders in a supersonic flow
    Gruber, MR
    Donbar, JM
    Carter, CD
    Hsu, KY
    JOURNAL OF PROPULSION AND POWER, 2004, 20 (05) : 769 - 778
  • [36] The Implication of Injection Locations in an Axisymmetric Cavity-Based Scramjet Combustor
    Relangi, Naresh
    Ingenito, Antonella
    Jeyakumar, Suppandipillai
    ENERGIES, 2021, 14 (09)
  • [37] Experimental study of hysteresis and catastrophe in a cavity-based scramjet combustor
    Xu ZHANG
    Qifan ZHANG
    Zhenjie WU
    Lianjie YUE
    Zhanbiao GAO
    Weihang LUO
    Hao CHEN
    Chinese Journal of Aeronautics, 2022, 35 (10) : 118 - 133
  • [38] Experimental study of hysteresis and catastrophe in a cavity-based scramjet combustor
    Zhang, Xu
    Zhang, Qifan
    Wu, Zhenjie
    Yue, Lianjie
    Gao, Zhanbiao
    Luo, Weihang
    Chen, Hao
    CHINESE JOURNAL OF AERONAUTICS, 2022, 35 (10) : 118 - 133
  • [39] Supersonic combustion of n-Heptane droplets with cavity-based fuel injection
    Mohamadi, Mehdi
    Tahsini, AmirMahdi
    AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, 2023, 95 (10): : 1510 - 1517
  • [40] Experimental investigation of flameholding in a cavity-based scramjet combustor by a multi-channel gliding arc
    Feng, Rong
    Sun, Mingbo
    Wang, Hongbo
    Huang, Yuhui
    Tian, Yifu
    Wang, Chao
    Liu, Xu
    Zhu, Jiajian
    Wang, Zhenguo
    AEROSPACE SCIENCE AND TECHNOLOGY, 2022, 121