Effect of the nature of vitiated crossflow on the flow-field of a transverse reacting jet

Panda, Pratikash; Busari, Oluwatobi; Lucht, Robert P.; Laster, W. R.

doi:10.1007/s00348-016-2288-4

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…Fouling of windows due to tracer particles for velocimetry techniques such as PIV is a significant challenge in the open literature for high temperature flows. Since a film-cooling flow over the inner window is not used for this design, velocimetry through a technique such as femtosecond laser electronic excitation tagging might be preferable compared to PIV, although highspeed PIV measurements with intermittent particle seeding may still be useful for such measurements [9][10][11][12].…”

Section: Double-window Configuration To Withstand High-temperature Co...mentioning

confidence: 99%

“…The jet-in-crossflow is a canonical problem that spans a wide range of power, propulsion, and other applications [5]. The reacting jet in crossflow has become an increasingly popular topic of research over the last several years and the existing works in subsonic, reacting jet-in-crossflow literature can generally be divided in three ways: 1) heated air [6,7,8] or vitiated crossflow , 2) atmospheric [2,6,7,[15][16][17][18][19][20][21][22][23][24][25][26]29] or engine-relevant [8-14, 27, 28] conditions, and 3) fuel-only [6-8, 11-15, 27-29] or premixed fuel-air [2,[8][9][10][11][16][17][18][19][20][21][22][23][24][25] injection. Previous works that have developed optically accessible secondary combustion zones (SCZs) for steady-state, enginerelevant operation include efforts at Purdue University [8][9][10][11][12], Georgia Institute of Technology [13,14], and DLR-Stuttgar...…”

Section: Introductionmentioning

confidence: 99%

“…The studies by Broda et al [36] and Janus et al [37] used a cylindrical flame tube, whereas the studies at Purdue [38,39] used a rectangular cross-section. Doublewindowed designs were used at Purdue by both Thariyan et al [38] and Slabaugh et al [39], whereas pressure vessel designs are used by Broda et al and Janus et al Some of the previous optically accessible test sections at Purdue, both for primarystage combustion [38,39] and axially staged combustion [8][9][10][11][12], used a film-cooling flow on the combustion gas side of the inner window. The experiment at Darmstadt Technical University [37], did not use film-cooling but instead used a double-wall, air-cooled flame tube.…”

Section: Introductionmentioning

confidence: 99%

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An optically accessible secondary combustion zone for the transverse injection of reacting jets into a high-speed, vitiated crossflow within a staged, gas turbine model combustor

Rodrigues¹,

McDonald²,

Busari³

et al. 2020

Meas. Sci. Technol.

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Advanced gas turbine combustion strategies, such as axially staging the fuel, are of great interest due to their potential to increase cycle efficiency while maintaining low levels of pollutants. In our previous work within a staged gas turbine model combustor, we used exhaust gas emissions measurements to demonstrate a significant NOX reduction by increasing the combustor exit Mach number, even at a constant residence time. In this paper, the development of an optically accessible secondary combustion zone (SCZ) to further study the injection of a reacting jet into a high-speed vitiated crossflow is described. Measurements were targeted for a nominally 1700 K vitiated crossflow, a premixed jet at an unburnt temperature of nominally 500 K, and a combustor pressure of 500 kPa. Key aspects of this design challenge include the high-speed and high temperature crossflow leading to relatively high convective heat flux at the inner surface of the windows and the necessary use of a narrow channel for the combustion gas. Emphasis is placed on the critical design features: a double-windowed design, an air-cooling scheme based on forced convection of air between the inner and outer windows, and intricate water-cooling circuits for the metal hardware. These design features have enabled long-duration, steady-state operation despite elevated pressure, high combustion gas temperatures, and high-speed reacting flows. The SCZ has survived operation at MW thermal powers over several hours of continuous operation and over a dozen test days to date; a set of windows retained good transparency without discoloration for typically 3–4 test days. Survivability of the windows through the air-cooling design has enabled us to study the reacting jet-in-crossflow at the desired high-speed conditions, without risking disturbing the physics with a window film-cooling flow. The capability to acquire useful measurements is illustrated using chemiluminescence imaging, pressure measurements, and emissions sampling.

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Section: Double-window Configuration To Withstand High-temperature Co...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An optically accessible secondary combustion zone for the transverse injection of reacting jets into a high-speed, vitiated crossflow within a staged, gas turbine model combustor

Rodrigues¹,

McDonald²,

Busari³

et al. 2020

Meas. Sci. Technol.

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“…A configuration that is somehow related with the one presented here, is the jet-incrossflow (JICF) arrangement. Several experimental and numerical studies have been performed for premixed jets in hot vitiated crossflows, see for example [26][27][28][29][30]. A general finding was that autoignition assisted the flame stabilization, particularly on the windward side, and that also turbulent flame propagation contributed to flame stabilization.…”

Section: Introductionmentioning

confidence: 99%

Laser diagnostic investigation of a confined premixed turbulent jet flame stabilized by recirculation

Severin

Lammel

Meier

2022

Combustion and Flame

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“…Inhomogeneities in the jet flame caused by insufficient mixing between fuel and air in a nonpremixed RJICF can generate high temperature hot-spots, often associated to high-NOx emissions. For this reason, research has recently focused on premixed RJICF configurations [11,12,13,14,15,16,17,18,19]. Schmitt et al [11] studied premixed preheated jets of air-NG over wide range of momentum and equivalence ratios, showing that flame ignition always occuring near the jet root in their configuration.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Dynamics of a Premixed Hydrogen-Methane-Air Jet Flame in Hot Vitiated Turbulent Crossflow

SOLANA-PEREZ¹,

Shcherbanev²,

Miniero³

et al. 2021

Preprint

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The effect of hydrogen enrichment of a premixed hydrogen-methane-air jet in hot vitiated crossflow was studied at atmospheric condition. The hot turbulent vitiated crossflow is generated by a symmetric array of 4×4 jet flames burning a lean mixture of natural gas and air in fully premixed condition at equivalence ratio ϕ cf = 0.7 and total thermal power of 50 kW. This crossflow is then used to ignite the premixed perpendicular jet of hydrogen-methane-air at ambient temperature. Three jet parameters are varied to study the effect of hydrogen addition on the flame morphology and stabilization mechanism: the hydrogen mass fraction of the H 2 /CH 4 fuel blend (ξ = 0−100%), the jet equivalence ratio (ϕ = 0.8 − 2.0) and the jet-to-crossflow momentum ratio (J = 3 − 12). High-speed hydroxyl (OH) chemiluminescence is used to obtain the time-resolved imaging of the reactive jet and to compute its time averaged morphology. OH planar laser induced fluorescence (OH-PLIF) is used to acquire OH concentration fields at the jet center plane. The jet morphology is analyzed by considering its mean trajectory, extracted from the experimental data and fitted with empirical correlations available from the literature. New correlations are proposed for the flame length, width and center of gravity as function of the hydrogen content. It is shown that with increasing hydrogen fraction, the flame is shortened and more compact, and it stabilizes close to the jet root. Another finding of this work is the reattachment of the flame at the base of the windward jet shear layer when hydrogen fraction is increased. Robust flame anchoring is observed for H 2 mass fractions of the CH 4 /H 2 fuel blend that exceed 50%. Moreover, it is shown using instantaneous OH-PLIF images that for these conditions of increasing hydrogen concentration, the windward shear layer features larger-scale coherent structures that govern the aerodynamics of the reactive premixed jet in turbulent vitiated crossflow.

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Effect of the nature of vitiated crossflow on the flow-field of a transverse reacting jet

Cited by 9 publications

References 36 publications

An optically accessible secondary combustion zone for the transverse injection of reacting jets into a high-speed, vitiated crossflow within a staged, gas turbine model combustor

An optically accessible secondary combustion zone for the transverse injection of reacting jets into a high-speed, vitiated crossflow within a staged, gas turbine model combustor

Laser diagnostic investigation of a confined premixed turbulent jet flame stabilized by recirculation

Morphology and Dynamics of a Premixed Hydrogen-Methane-Air Jet Flame in Hot Vitiated Turbulent Crossflow

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