Ignition and supersonic combustion behavior of liquid ethanol in a scramjet model combustor with cavity flame holder

Nakaya, Shinji; Hikichi, Yuta; Nakazawa, Yoshiki; Sakaki, Kazuki; Choi, Min-Ho; Tsue, Mitsuhiro; Kono, Michikata; Tomioka, Sadatake

doi:10.1016/j.proci.2014.07.023

Cited by 45 publications

(4 citation statements)

References 27 publications

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“…Previous investigations have demonstrated that the flame and flow structures in a scramjet combustor with single cavity are drastically changed with the combustion modes. 16,29 However, the flame and flow characteristics in the supersonic combustors with multiple cavities were still hardly reported in the existing literature. In our previous tests, we found that the flame distributions in the supersonic combustor with single-side expansion and dual parallel cavities were remarkably asymmetric.…”

Section: Introductionmentioning

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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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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Section: Introductionmentioning

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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“…However, there are few studies on the influence of cavities on slow flow combustion. Li et al proposed a novel design concept and improved the enhancement of H 2 /CH 4 , CH 4 /CO, and H 2 /CO and blended fuels by catalyst segmentation and cavity technologies in a micro channel [88][89][90]. It was found that the existence of cavity can significantly expand the stable operation range in a wide inlet velocity range for micro-reactor.…”

Section: Cavitymentioning

confidence: 99%

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

et al. 2021

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With the improvement and development of micro-mechanical manufacturing technology, people can produce an increasing variety of micro-electromechanical systems in recent years, such as micro-satellite thrusters, micro-sensors, micro-aircrafts, micro-medical devices, micro-pumps, and micro-motors. At present, these micro-mechatronic systems are driven by traditional energy power systems, but these traditional energy power systems have such disadvantages as short endurance time, large size, and low energy density. Therefore, efforts were made to study micro-energy dynamical systems with small size, light gravity, high density and energy, and long duration so as to provide continuous and reliable power for these systems. In general, the micro-thermal photoelectric system not only has a simple structure, but also no moving parts. The micro-thermal photoelectric system is a micro-energy power system with good application prospects at present. However, as one of the most important structural components of micro-thermal photoelectric systems, the microburner, is the key to realize the conversion of fuel chemical energy to electric energy in micro-thermal photoelectric system. The studies of how to improve the flame stability and combustion efficiency are very necessary and interesting. Thus, some methods to improve the performance of micro-burners were introduced and summarized systematically, hoping to bring some convenience to researchers in the field.

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“…Among the experimental configurations available in the literature [7][8][9][10][11], that of AFRL is chosen because a large number of experiments have been carried out with this device over the years.…”

Section: Configuration Descriptionmentioning

confidence: 99%

Analysis of combustion modes in a cavity based scramjet

Ruan

Domingo

Ribert

2020

Combustion and Flame

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Large eddy simulations (LES) of non reactive and reactive flows in a cavity-based scramjet combustor configuration from the U.S Air Force Research Laboratory (AFRL) are performed. These simulations feature a 22 species and 206 reactions chemical scheme for ethylene/air. The ability of LES to reproduce the main features found in the experiment is first emphasised such as the average velocity field and the stability of the combustion for the case studied. The influence of the mesh resolution and of the thermal wall condition on the simulation results is also investigated along with the soundness of the use of a laminar model for the filtered source terms. The results of the simulations with the finest grid (resolution of 100 micrometers in the flame region) are then employed to gain understanding in the flame dynamics. This reactive simulation shows the persistence of the two recirculation zones already present in the non reactive flow. The globally high temperature into the cavity helps to sustain a reactive zone located in the mixing layer above the cavity. Combustion first occurs in a diffusion dominated regime followed by the efficient burning of a well stirred mixture (rich then lean). A significant diffusion dominated burning is also found inside the cavity. The links between the residence time inside the cavity and the efficiency of the combustion are explored along with the velocity/heat release correlation.

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Ignition and supersonic combustion behavior of liquid ethanol in a scramjet model combustor with cavity flame holder

Cited by 45 publications

References 27 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

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

Analysis of combustion modes in a cavity based scramjet

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