Heat release and flame structure measurements of self-excited acoustically-driven premixed methane flames

Kopp-Vaughan, Kristin M.; Tuttle, Steven G.; Renfro, Michael W.; King, Galen B.

doi:10.1016/j.combustflame.2009.06.018

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…To extract the temporal sequence of events leading to combustion instabilities, a statistical analysis of experimental data is then needed. The phase-averaged analysis is the most common method to study cyclic phenomena: in particular, in combustion experiments [5,[36][37][38][39][40][41]. Nonetheless, a periodical reference signal is needed to perform this analysis.…”

Section: B Processing Techniquesmentioning

confidence: 99%

Liquid-Fuel Behavior in an Aeronautical Injector Submitted to Thermoacoustic Instabilities

Apeloig

d'Herbigny

Simon

et al. 2015

Journal of Propulsion and Power

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International audienceThe aim of this work is to study the role of the liquid phase in the thermo-acoustic coupling which subsequently leads to combustion instabilities. Experimental investigations were performed on an actual multipoint spray injector geometry used in real aeronautical combustors. A test bench was specifically designed with continuously changeable acoustics conditions; which allows obtaining a stable or an unstable flame for identical flow conditions. Different laser-based visualization techniques were used to analyze the kerosene spray (both liquid and vapor phases) and the heat released from the flame. A phase-averaged data processing of the Planar Laser-Induced Fluorescence (PLIF) images reveals the complex unsteady behavior of the liquid phase and its coupling with pressure fluctuations in the chamber and the heat released from the flame. The origins of the spray fluctuations are also analyzed. Nomenclature = surface of the control system boundary, m 2 = volume of the control system, m 3 = heat capacity ratio = characteristic time, s dA = surface integration variable, 1 m 2 dt = time integration variable, 1 s dV = volume integration variable, 1 m 3 D REF = reference diameter F = Flame Describing Function FSP = Fuel Split Parameter GER = Global Equivalent Ratio I = light intensity over camera dynamics, # counts IEL = Inner Exhaust Length, mm J = momentum ratio air m  = air mass flow rate, g/s P f m ,  = fuel mass flow rate on the pilot system, g/s MP f m ,  = fuel mass flow rate on the multipoint system, g/s p' = acoustic pressure, Pa p = averaged pressure, Pa q' = unsteady heat release, W/m 3 Ra = local Rayleigh index T = instability cycle period, s T air = air inlet temperature, K u' = acoustic velocity, m/

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Section: B Processing Techniquesmentioning

confidence: 99%

Liquid-Fuel Behavior in an Aeronautical Injector Submitted to Thermoacoustic Instabilities

Apeloig

d'Herbigny

Simon

et al. 2015

Journal of Propulsion and Power

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“…However, with different combinations of heat supply and the mass flow rate, they could obtain all the first three modes at one single location of L/16. Subsequently, various investigators conducted experiments on a Rijke tube to study thermo-acoustic characteristics of combustion, 11,[15][16][17] where effect of equivalence ratio was also considered. 15,17 As against the above experiments on a vertical Rijke tube with combustion, use of a horizontal Rijke tube with electrical heater and forced mean flow has also been made in some investigations to characterize the thermo-acoustics without the fear of lean flame blowout.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, various investigators conducted experiments on a Rijke tube to study thermo-acoustic characteristics of combustion, 11,[15][16][17] where effect of equivalence ratio was also considered. 15,17 As against the above experiments on a vertical Rijke tube with combustion, use of a horizontal Rijke tube with electrical heater and forced mean flow has also been made in some investigations to characterize the thermo-acoustics without the fear of lean flame blowout. 7,8,18,19 Prospective benefits of suppressing the thermoacoustic instability have drawn attention of many investigators since long and various control techniques, both passive and active, have been developed.…”

Section: Introductionmentioning

confidence: 99%

Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Deshmukh

Sharma

2016

International Journal of Spray and Combustion Dynamics

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The present work describes the occurrence of thermo-acoustic instability inside a horizontal Rijke tube and its suppression using an open loop active control technique. The Rijke tube is provided with a co-axial pre-mixed gas burner as the source of heat, which could be placed at any desired position. Radial injection of air (less than 3% of the total mass flow) through micro-jets into the flame is used as a control technique to suppress the thermo-acoustic instability. The rise in heat content inside the Rijke tube, estimated from the temperature mapping, clearly shows reduction in the heat loss as a result of complete suppression of the thermo-acoustic instability. However, the stability achieved passively by means of a slight shift in the burner position does not result in any change in the heat content. There is a visible change in the appearance of the burner flame when the above two methods are used to suppress the thermo-acoustic instability. The flame is seen to significantly shrink in length and spread radially when the control technique was applied. The flame dynamics is believed to determine the heat loss and hence the heat content inside the Rijke tube.

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Characterization of flame-shedding behavior behind a bluff-body using proper orthogonal decomposition

Kostka

Lynch

Huelskamp

et al. 2012

Combustion and Flame

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Heat release and flame structure measurements of self-excited acoustically-driven premixed methane flames

Cited by 8 publications

References 33 publications

Liquid-Fuel Behavior in an Aeronautical Injector Submitted to Thermoacoustic Instabilities

Liquid-Fuel Behavior in an Aeronautical Injector Submitted to Thermoacoustic Instabilities

Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Characterization of flame-shedding behavior behind a bluff-body using proper orthogonal decomposition

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