OH PLIF Visualization of a Premixed Ethylene-fueled Dual-Mode Scramjet Combustor

Cantu, Luca; Gallo, Emanuela; Cutler, Andrew D.; Danehy, Paul M.; Johansen, Craig T.; Rockwell, Robert D.; Goyne, Christopher P.; McDaniel, James C.

doi:10.2514/6.2016-1763

Cited by 22 publications

(7 citation statements)

References 31 publications

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“…OH-PLIF measurements in a premixed ethylene-fueled dual-mode scramjet combustor for combustion cases and NO-PLIF measurements for non-combustion cases were compared by Cantu. 32 The results reveal that the dominant contributor to flame propagation is freestream turbulence rather than heat release and concentration gradients. When the turbulence level is comparatively higher, the turbulent exchange of mass and energy between the cavity and mainstream is enhanced, promoting the interaction of combustion products in the recirculation zone with unburned reactants in the supersonic flow.…”

Section: Resultsmentioning

confidence: 93%

Experimental investigation on the ignition limits of a kerosene-fueled cavity in model scramjet combustor

Liu

Pan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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The ignition limits of liquid kerosene injected upstream of a cavity flameholder using a spark plug are investigated in a model scramjet combustor with the isolator entrance Mach number of 2.52, the total pressure of 1.6 MPa, and stagnation temperature of 1486 K. The effects of injection pressure and mixing distance on ignition are studied. Flame dynamics and the evolution of the flow field during the ignition process are acquired through high-speed photography and Schlieren photography. For near-field injection, successful ignition of kerosene can only be achieved when the injection pressure is extremely low or in a higher injection pressure range. The ignition is failed due to the fuel-rich local equivalence ratio in the cavity recirculation zone when the injection pressure is in the middle of injection pressure range. For far-field injection, the ignition trend is totally opposite compared with near-field injection. The ratio of the fuel that the cavity can react completely to that consumed by the mainstream is extremely low due to the minimal mass exchange rate between the cavity and the mainstream. The local equivalence ratio in cavity is the controlling factor determining whether successful ignition could be achieved. Only local ignition with low combustion efficiency is achieved in the present single-cavity combustor. The flame could not spread to the mainstream due to the lower turbulence level weakening the interaction of combustion products in the recirculation zone with unburned reactants in the supersonic flow.

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Section: Resultsmentioning

confidence: 93%

Experimental investigation on the ignition limits of a kerosene-fueled cavity in model scramjet combustor

Liu

Pan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…OH-PLIF measurements in a premixed ethylene-fueled dual-mode scramjet combustor for combustion cases and NO-PLIF measurements for non-combustion cases were compared by Cantu. 28 The results reveal that the dominant effect of flame propagation is freestream turbulence rather than heat release and concentration gradients. When the turbulence level is comparatively higher, the turbulent exchange of mass and energy between the cavity and mainstream is enhanced, promoting the interaction of combustion products in the recirculation zone with unburned reactants in the supersonic flow.…”

Section: Resultsmentioning

confidence: 94%

Experimental investigation on the flame stabilization modes of liquid kerosene in a cavity-based scramjet combustor

Liu

Pan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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The flame stabilization modes of liquid kerosene is investigated in a model scramjet combustor with flight condition of Ma 6. The effects of equivalence ratio and cavity configuration schemes on the flame stabilization modes are studied. Flame propagations and the evolution of the flow field from the ignition to the establishment of stable flame in the supersonic flow are acquired through high-speed photography and schlieren photography. Only cavity-recirculation-region stabilized combustion can be obtained in the single-cavity scramjet combustor. The intensity of combustion is weak and is termed as local ignition with low combustion efficiency. In the tandem-cavity scramjet combustor, the flame stabilization mode is largely determined by the total equivalence ratio. The flame could spread into the mainstream and even propagate against the supersonic flow as the equivalence ratio increases. The positive feedback mechanism between combustion and precombustion shock train is responsible for the evolutions of the flame stabilization modes, where the interactions between shock waves and turbulent boundary layer play a key role in the flame propagation process. The large-scale eddies in the shear layer of the upstream cavity shed at the cavity aft wall and could enhance the turbulent levels of the incoming flow of the downstream cavity. Consequently, an intense kerosene flame can be ignited in the tandem-cavity combustor. The flame could not spread to the mainstream in the single-cavity combustor due to the lower turbulence level weakening the interaction of combustion products in the recirculation zone with unburned reactants in the supersonic flow.

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“…The dye laser output was tuned to 567.10 nm and frequency doubled to 283.55 nm in order to excite the Q1(8) transition of OH. This transition was used because fluorescence intensity at this wavelength is relatively temperature-independent 1,16 so that variations in signal intensity can be interpreted mainly as OH concentration variations (and not temperature variations). Energy at the output of the dye laser was approximately 15 mJ/pulse.…”

Section: Beam Pathmentioning

confidence: 99%

“…This study improves upon the work done by Cantu et al who previously performed OH PLIF imaging in the same flowpath and facility. 1 Two important changes were made for this study. First, extension tubes were added to the camera lens in order to increase magnification and in-plane resolution.…”

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confidence: 99%

High-Spatial-Resolution OH PLIF Visualization in a Cavity-Stabilized Ethylene-Air Turbulent Flame

Geipel

Rockwell

Chelliah

et al. 2017

33rd AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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OH PLIF Visualization of a Premixed Ethylene-fueled Dual-Mode Scramjet Combustor

Cited by 22 publications

References 31 publications

Experimental investigation on the ignition limits of a kerosene-fueled cavity in model scramjet combustor

Experimental investigation on the ignition limits of a kerosene-fueled cavity in model scramjet combustor

Experimental investigation on the flame stabilization modes of liquid kerosene in a cavity-based scramjet combustor

High-Spatial-Resolution OH PLIF Visualization in a Cavity-Stabilized Ethylene-Air Turbulent Flame

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