Effects of fuel cracking on combustion characteristics of a supersonic model combustor

Combustion characteristics in a supersonic combustor with ethylene injection upstream of dual parallel cavities were investigated experimentally in a direct-connected test rig with inflow conditions of Ma = 3.46, Po = 3.60 Mpa and To = 1430 K. The combustor has a two-dimensional rectangular configuration with single-side expansion. Two open cavities with the same size were mounted on the expanded and horizontal walls, respectively. Static pressure distribution in the axial direction was measured along the centerline of the expanded wall. High-speed flame luminosity and schlieren were used to capture the combustion and flow structures at different equivalence ratios. Two clusters of separated and asymmetric flames were found to be stabilized near the dual parallel cavities in all tests. The flame and flow characteristics changed with the combustion modes. For scramjet mode, no obvious flow separation occurred near the walls and the two flames were both stabilized in the cavity shear layer and recirculation zone. For ramjet mode, the high back pressure resulting from intense heat release induced a large-scale recirculation zone upstream of the cavity mounted on the expanded wall, which supplied a favorable combustion condition and the flame was stabilized in the jet-wake. Meanwhile, there was no obvious separation near the horizontal wall, with the local flame stabilized in the cavity shear layer. It is suggested that the combustion near the horizontal wall should be enhanced to improve the combustion performance and avoid a non-uniform flow field at the combustor exit.

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“…The repetitive ability of the experiment system has been validated by a large number of experiments. 31,32…”

Section: Facility Descriptionsmentioning

confidence: 99%

Combustion characteristics in a supersonic combustor with ethylene injection upstream of dual parallel cavities

Zhong

Wang

Sun

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The repetitive ability of the experimental system has been validated based on a large number of experiments. 20–22…”

Section: Experimental Description and Resultsmentioning

confidence: 99%

Dynamic combustion characteristics in a rectangular supersonic combustor with single-side expansion

Gao

Liang

Sun

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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Dynamic combustion characteristics of a rectangular scramjet combustor with single-side expansion were studied experimentally and numerically. Experiments were implemented with an isolator entrance Mach number of 3.46, and an air stagnation temperature of 1430 K. Ethylene was utilized to fuel the combustor over an equivalence ratio range of 0.20 < φ < 0.63. Results indicated that the combustion modes varied from different equivalence ratios. For an intermediate φ = 0.375, an intermittent dynamic combustion occurred. During the dynamic process, the flame sometimes stabilized in the jet wake of the top cavity, and at other time it oscillated between dual parallel cavities. The pseudo-shock train traveled periodically along the length of the combustor, and the penetration depths of the two injectors exchanged. Quantitative analysis illustrated that the average frequency of unsteady combustion was approximately 200 Hz. The reason for the occurrence of the self-sustained dynamic process was related to the interactions between the shock-induced separated region and heat release.

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“…Ethylene (C 2 H 4 ) has the advantages of easy storage, short ignition delay time, and great energy per unit volume, which is also an important intermediate during oxidation and pyrolysis process of large hydrocarbons. [1][2][3][4][5] Thus, it serves as fuel or surrogate fuel in practical scramjet combustors. 3,[6][7][8][9][10][11] Ethylene kinetic mechanism with high accuracy is one of the key elements for combustion simulation of ethylene-fueled scramjet combustors to reveal their combustion and ow phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Thus, it serves as fuel or surrogate fuel in practical scramjet combustors. 3,[6][7][8][9][10][11] Ethylene kinetic mechanism with high accuracy is one of the key elements for combustion simulation of ethylene-fueled scramjet combustors to reveal their combustion and ow phenomena.…”

Section: Introductionmentioning

confidence: 99%

Application of static integrated skeletal reduction and tabulation of dynamic adaptive chemistry in the combustion simulation of ethylene-fueled scramjet combustor

Li,

Liu,

Wang

2024

RSC Adv.

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Effects of fuel cracking on combustion characteristics of a supersonic model combustor

Cited by 24 publications

References 29 publications

Combustion characteristics in a supersonic combustor with ethylene injection upstream of dual parallel cavities

Combustion characteristics in a supersonic combustor with ethylene injection upstream of dual parallel cavities

Dynamic combustion characteristics in a rectangular supersonic combustor with single-side expansion

Application of static integrated skeletal reduction and tabulation of dynamic adaptive chemistry in the combustion simulation of ethylene-fueled scramjet combustor

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