A Detailed Investigation of Bluff Body Stabilized Flames

Kiel, Barry; Garwick, Kyle; Gord, James R.; Miller, Joseph D.; Lynch, Amy; Hill, Roger W.; Phillips, Scott

doi:10.2514/6.2007-168

Cited by 52 publications

(16 citation statements)

References 4 publications

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“…This observation is quite significant as it shows that the dominant fluid mechanics in a lab scale burner with non preheated reactants, which have a "high" density ratio, can be very different from that of a facility with highly preheated reactants. Similarly, other experiments have clearly shown that the BVK instability becomes prominent either at low flame density ratios [22][23] or for flames close to blowoff 22,24 .…”

Section: Introductionsupporting

confidence: 57%

Dependence of the Bluff Body Wake Structure on Flame Temperature Ratio

Emerson

Lundrigan

O’Connor

et al. 2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This paper describes an experimental investigation of the wake and flame characteristics of a bluff body stabilized flame. Prior investigations have clearly shown that the wake structure is markedly different at "high" and "low" flame density ratios. This paper describes a systematic analysis of the dependence of the flow field characteristics and flame sheet dynamics upon flame density ratio, ρ u /ρ b , over the range 1.7< ρ u /ρ b <3.4. This paper shows that two fundamentally different flame/flow behaviors are observedcharacterized here as Kelvin-Helmholtz and Von-Karman vortex street dominated -at high and low ρ u /ρ b values, respectively. These are interpreted here as a transition from a convectively to absolutely unstable flow. This transition manifests itself in several ways with decreasing ρ u /ρ b values, including (1) the spectrum of the flame motion and flow field transitions from a distributed to a narrowband peak at St~0.24, and (2) the correlation between the two flame front branches monotonically increases. Finally, the intermittent nature of the flow field is emphasized, with the relative fraction of the two different flow/flame behaviors monotonically varying with ρ u /ρ b .

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Section: Introductionsupporting

confidence: 57%

Dependence of the Bluff Body Wake Structure on Flame Temperature Ratio

Emerson

Lundrigan

O’Connor

et al. 2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…The majority of existing analyses and experiments have focused on symmetric configurations (symmetric geometry and time-averaged flow). 20,21,27,28 A notable exception is the recent experiments by Tuttle et al, 29 who analyzed the dynamics of combusting wakes which were fueled with varying degrees of transverse stratification with respect to the bluff body centerline. Figure 2(a) shows their stratified equivalence ratio profile, where the nominal equivalence ratio, φ, varies between φ − φ ε and φ + φ ε at y = H and y = −H, respectively.…”

mentioning

confidence: 99%

Spatio-temporal linear stability analysis of stratified planar wakes: Velocity and density asymmetry effects

et al. 2016

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“…The representative work on this topic was conducted by Kiel et al [20][21]. The most distinctive characteristic of this method is selecting the Damköhler (Da) number as the stability criteria of flame.…”

Section: Numerical Based Hybrid Prediction Methodsmentioning

confidence: 99%

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

Huang¹,

Sun²

2018

dteees

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The lean blowout (LBO) limit plays a critical role in the operation of gas turbine combustors. In order to achieve the quick prediction of the LBO limit, three major prediction tools for the LBO limit, i.e. the semi-empirical correlation, the numerical prediction method and the hybrid prediction method are proposed. The semi-empirical correlations are mainly based on the characteristic time (CT) model and the perfect stirred reactor (PSR) model. The semi-empirical correlations based on the PSR model are widely applied. Among these correlations, Lefebvre's LBO model that had been validated on 8 different aero gas turbine combustors with the uncertainty ±30% is the most successful. Later, many researchers did further studies to improve Lefebvre's LBO model. The numerical prediction methods are reported increasingly with the rapid development of the computing power. Up to now, some researchers validated the numerical prediction methods in 2 different combustor configurations with the prediction uncertainties about ±25%. More studies are required to validate the effects of the combustor configurations and the atomization performances on the LBO limit. The hybrid prediction methods try to combine the semi-empirical correlations with the numerical methods and are widely attempted in recent years. Many researchers have studied the numerical based hybrid method, which needs more validations and general criterions for different configurations and operating conditions. Other researchers have studied the semi-empirical based hybrid method, which has shown good agreement for 11 different combustor configurations with the prediction uncertainties about ±16%. Further improvements are required for all prediction tools to achieve more general and accurate predictions for the LBO limits of gas turbine combustors.

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A Detailed Investigation of Bluff Body Stabilized Flames

Cited by 52 publications

References 4 publications

Dependence of the Bluff Body Wake Structure on Flame Temperature Ratio

Dependence of the Bluff Body Wake Structure on Flame Temperature Ratio

Spatio-temporal linear stability analysis of stratified planar wakes: Velocity and density asymmetry effects

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

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