The effects of differential diffusion in counter-flow premixed flames with dilution and hydrogen enrichment

Abbasi-Atibeh, Ehsan; Bergthorson, Jeffrey M.

doi:10.1016/j.combustflame.2019.07.035

Cited by 15 publications

(5 citation statements)

References 85 publications

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“…Although the present model has been only validated for turbulent planar and Bunsen flames due to the requirement of the same consumption-based s T definition, it can be applied to flames with other geometries. Our preliminary test shows that the present s T model prediction qualitatively agrees with the experimental data of V-flames of the methane/air mixture [71,72] and counterflow flames of the blended fuel mixture of CH 4 /H 2 and C 3 H 8 /H 2 [24], though different s T definitions were used in these flame data. For spherical flames, most experiments observed the accelerating outwardly propagating flame front [73,74,75] which has not reached a statistically stationary state, and s T was reported as an average over a range of flame radii [9,74,75].…”

Section: Overall Performance Of Model Predictionsupporting

confidence: 73%

“…The flame stretch effect has been investigated numerically and experimentally [21,22,23,24,25,26], and this effect on flamelet speed is represented by the stretch factor I 0 [27].…”

Section: Introductionmentioning

confidence: 99%

“…Diffusionally neutral flames have I 0 ≈ 1 [21], while the thermal-diffusive effects cause I 0 away from unity [22,23,24,25] indicating a strong dependence of s T on flame stretch.…”

Section: Introductionmentioning

confidence: 99%

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A predictive model of the turbulent burning velocity for planar and Bunsen flames over a wide range of conditions

Lu¹,

Yang

2021

Preprint

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We propose a predictive model of the turbulent burning velocity s T over a wide range of conditions. The model consists of sub models of the stretch factor and the turbulent flame area. The stretch factor characterizes the flame response of turbulence stretch and incorporates effects of detailed chemistry and transport with a lookup table of laminar counterflow flames. The flame area model captures the area growth based on Lagrangian statistics of propagating surfaces, and considers effects of turbulence length scales and fuel characteristics. The present model predicts s T via an algebraic expression without free parameters.It is validated against 285 cases of the direct numerical simulation or experiment reported from various research groups on planar and Bunsen flames over a wide range of conditions, covering fuels from hydrogen to n-dodecane, pressures from 1 to 20 atm, lean and rich mixtures, turbulence intensity ratios from 0.35 to 110, and turbulence length ratios from 0.5 to 80. The comprehensive comparison shows that the proposed s T model has an overall good agreement over the wide range of conditions, with the averaged modeling error of 25.3%. Furthermore, the model prediction involves the uncertainty quantification for model parameters and chemical kinetics to extend the model applicability.

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Section: Overall Performance Of Model Predictionsupporting

confidence: 73%

“…The flame stretch effect has been investigated numerically and experimentally [21,22,23,24,25,26], and this effect on flamelet speed is represented by the stretch factor I 0 [27].…”

Section: Introductionmentioning

confidence: 99%

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A predictive model of the turbulent burning velocity for planar and Bunsen flames over a wide range of conditions

Lu¹,

Yang

2021

Preprint

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“…A frequency-double Quanta-Ray Nd:YAG laser (PRO-250-10H, Spectra physics, Santa Clara, CA, USA) was used to pump a dye laser (ND6000, Continuum, Boston, MA, USA) to generate 283.049 nm UV laser(with pulse energy of 15 mJ) with a frequency doubler. This UV laser was made to a vertical laser sheet with a length of 32 mm passing through the center of flame vertically to excite Q 1 (8) line of OH with the transition of A 2 Σ ← X 2 Π(1, 0) . The corresponding fluorescence was captured by an intensified charge coupled device (ICCD) camera (PI MAX 3, Princeton Instruments, Trenton, NJ, USA) with a 1024 × 1024 pixel array.…”

Section: Experiments Setupmentioning

confidence: 99%

“…The dilution can be achieved with exhaust gas recirculation (EGR), steam, or low calorific value (LCV) fuels utilization, which normally contain a massive amount of incombustible gas, such as N 2 , CO 2 , and H 2 O. These gases make the chemical reaction rate drop significantly and combustion process out of the normal flame-let regime more easily [4][5][6][7][8][9][10][11]. Recently, many studies about the effect of dilution on the characteristics of combustion have been performed, such as turbulent burning velocity, flame stability, flame structure, and pollution emission [2,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

et al. 2020

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Diluting the combustion mixtures is one of the advanced approaches to reduce the NOx emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NOx. The effect of N2/CO2 dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH2O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH2O, and postpone the burning of fuel. Compared with the ultra-lean combustion, the dilution weakens the combustion more obviously. For different dilution gases, the concentration of OH in the combustion zone varies greatly, while the concentration of CH2O in the unburned zone is less affected by different dilution gas. The CO2 dilution has a more significant effect on OH concentration than N2 with the given dilution ratio, but a similar effect on the concentration of CH2O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.

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Turbulent Flames of Hydrogen

Masri

Cleary

Dunn

2023

Green Energy and Technology

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The effects of differential diffusion in counter-flow premixed flames with dilution and hydrogen enrichment

Cited by 15 publications

References 85 publications

A predictive model of the turbulent burning velocity for planar and Bunsen flames over a wide range of conditions

A predictive model of the turbulent burning velocity for planar and Bunsen flames over a wide range of conditions

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

Turbulent Flames of Hydrogen

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