Combustion in a Ramjet Combustor with Cavity Flame Holder

Tunçer, Onur

doi:10.2514/6.2010-1532

Cited by 9 publications

(6 citation statements)

References 35 publications

(21 reference statements)

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“…A hybrid combustion mechanism termed auto-ignition assisted flame was proposed for both combustion stabilization modes, the reaction structure of which is shown in Figure 4. Tuncer 14 numerically studied the combustion characteristics in a ramjet combustor with cavity flameholder for an entrance Mach number of 1.4 and stagnation temperature of 702 K. It was also observed that the flame was stabilized in the cavity mode rather than the jet-wake mode for such a low stagnation temperature.…”

Section: Stabilization Modes and Mechanismsmentioning

confidence: 99%

“…Flush-wall injection coupled with a downstream cavity flameholder is found to be a simple but efficient approach in maintaining combustion in supersonic flows, 2,4,5,[10][11][12][13][14][15][16][17][18] where the combustion stabilization modes and spreading mechanisms are of particular importance and have received much attention.…”

Section: Stabilization Modes and Mechanismsmentioning

confidence: 99%

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Review of cavity-stabilized combustion for scramjet applications

Wang

Sun

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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Cavities are widely used as flameholders in supersonic combustors due to their outstanding potential to stabilize combustion without excessive total pressure loss. A review of cavity-stabilized combustion for scramjet applications is provided in this article. The topics cover the fundamental problems and recent advances regarding cavity-organized combustion in high-speed flows, including combustion stabilization modes and mechanisms, flame stability analyses and correlations, combustion oscillations, and other related issues. Remarkable questions such as cavity-coupled fuel injection, flow and combustion coupling, optimal cavity geometry and scale, auto-ignition and flame propagation interactions, and unsteady effects are discussed. Then, an attempt is made to provide some guidelines for the future research of cavity flameholders.

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Section: Stabilization Modes and Mechanismsmentioning

confidence: 99%

Section: Stabilization Modes and Mechanismsmentioning

confidence: 99%

Review of cavity-stabilized combustion for scramjet applications

Wang

Sun

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Compared to past research, recent investigations have focused on the flow characteristics and flame stabilization mechanism in cavity-based combustors [5][6][7][8]. For instance, Micka et al [9] experimentally studied the combustion characteristics of fuel injected upstream of the cavity in the flight Mach numbers of 4.3-5.4 and observed two flame stability modes.…”

Section: Introductionmentioning

confidence: 99%

Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor

et al. 2021

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To investigate the combustion modes and unsteady characteristics during the condition transition of a scramjet combustor, a series of experiments were carried out under the condition of Mach 2.52 supersonic incoming flow, the corresponding stagnation pressure and temperature of which were 1.6 MPa and 1486 K, respectively. A fuel supply system that could dynamically adjust the injection pressure was adopted to simulate the condition transition stage of a scramjet. Based on the advanced combustion diagnosis technique, the transient chemiluminescence image and the wall pressure were recorded during the whole combustion process. Three typical modes of turbulent combustion occurred when the injection pressure drop gradually increased. The jet flame was stable after the condition transition when the injection pressure drop was relatively low. An unstable combustion phenomenon accompanied by intermittent local extinction and reignition could be found near the blowout limits. With a further increase in the injection pressure drop, the flame was blown out quickly during the transition process. In addition, the flame development characteristics during condition transition under stable combustion mode and the effect of injection pressure drop were studied in detail. During the process of switching between the two conditions, the area and light intensity of the flame decreased over time, and the wall pressure was accordingly reduced. As the increase in injection pressure dropped, the intensity of chemical reactions deceased obviously and the transition time became longer.

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“…Simultaneously, major issues on flame stabilization [1] should be resolved. In premixed combustion, mixing process quickly occurs because fuel and air can easily be mixed even before they flow into the combustor [2]. Lean premixed combustion is a potential technology for preventing pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Investigation of Flame Holders in Combustion Chambers at Different Thermal Loads

Alhumairi

Yahya

Azzawi

2020

Journal of Thermal Engineering

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The effect on the dynamic stability of combustors with and without flame holders were investigated experimentally and computationally with thermal loads of 3, 5, and 9 kW. Three different cases were studied, large flame holder (LFH), small flame holder (SFH) and no flame holder (NO_ FH). Flame topology was investigated in these three cases. Moreover, lean propane-air premixed combustion were also considered for two models, turbulent flame speed closure (TFC) and coherent flame (CFM). These models were investigated using different turbulent kinetic energies and turbulence dissipation rates. Experiments were performed with mean inlet velocities of 16.5, 17, 29.2, 30.8, and 52.6 cm/s, excess air ratios (λ) of 1.6, 1.65, 1.7, and 1.8. The results showed that the flame topology and location are more sensitive to the increase in the excess air ratios and thermal loads in the large flame holder than in the small flame holder. Heat transfers and species distributions caused by combustion are also investigated for the large and small flame holders; in both cases, flame stability was sustained, and the flame front position moved upward regarding to the flame holder region.

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Combustion in a Ramjet Combustor with Cavity Flame Holder

Cited by 9 publications

References 35 publications

Review of cavity-stabilized combustion for scramjet applications

Review of cavity-stabilized combustion for scramjet applications

Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor

Experimental and Computational Investigation of Flame Holders in Combustion Chambers at Different Thermal Loads

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