Effects of pressure and fuel dilution on coflow laminar methane–air diffusion flames: A computational and experimental study

Cao, Su; Ma, Bin; Giassi, Davide; Bennett, Beth Anne V.; Long, Marshall B.; Smooke, Mitchell D.

doi:10.1080/13647830.2017.1403051

Cited by 18 publications

(4 citation statements)

References 59 publications

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“…The region in which the flame temperature seems to be decreased, perhaps because of an increase in soot concentration in those regions (refer Figure 10). Usually, an increase in soot concentration helps in decreasing the flame temperature through radiation heat loss [8,10]. Similarly, the region with an increase in flame temperature is attributed to the increased reaction rate with air temperature (refer to Figure 9).…”

Section: Temperature and Mean Mixture Fractionmentioning

confidence: 96%

“…Several studies are available to investigate the influence of combustor pressure and reactant temperature on soot formation, although mostly for laminar flames [1][2][3][4][5][6][7][8]. Mishra and Kumar [1] investigated the effect of preheated oxidizer (air) temperature in laminar LPG+H2/air diffusion flame.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported by Liu et al [7] that the increase in soot concentration at elevated pressure was mainly due to the increased mixture density and species concentration. Cao et al [8] investigated the effect of pressure on the structure, shape, and sooting behavior in a laminar co-flow methane-air diffusion flame. They observed that an increase in pressure results in a reduction of flame radius (varies approximately as P −1/2 ), a decreased flame lift-off height, and a constantly modified flame length.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

et al. 2021

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This article presents the results of computations on pilot-based turbulent methane/air co-flow diffusion flames under the influence of the preheated oxidizer temperature ranging from 293 to 723 K at two operating pressures of 1 and 3 atm. The focus is on investigating the soot formation and flame structure under the influence of both the preheated air and combustor pressure. The computations were conducted in a 2D axisymmetric computational domain by solving the Favre averaged governing equation using the finite volume-based CFD code Ansys Fluent 19.2. A steady laminar flamelet model in combination with GRI Mech 3.0 was considered for combustion modeling. A semi-empirical acetylene-based soot model proposed by Brookes and Moss was adopted to predict soot. A careful validation was initially carried out with the measurements by Brookes and Moss at 1 and 3 atm with the temperature of both fuel and air at 290 K before carrying out further simulation using preheated air. The results by the present computation demonstrated that the flame peak temperature increased with air temperature for both 1 and 3 atm, while it reduced with pressure elevation. The OH mole fraction, signifying reaction rate, increased with a rise in the oxidizer temperature at the two operating pressures of 1 and 3 atm. However, a reduced value of OH mole fraction was observed at 3 atm when compared with 1 atm. The soot volume fraction increased with air temperature as well as pressure. The reaction rate by soot surface growth, soot mass-nucleation, and soot-oxidation rate increased with an increase in both air temperature and pressure. Finally, the fuel consumption rate showed a decreasing trend with air temperature and an increasing trend with pressure elevation.

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Section: Temperature and Mean Mixture Fractionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

et al. 2021

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“…The effect of CO 2 addition on the flame structure has been considered by some researchers. Cao et al [11] studied the impacts of pressure and dilution of fuel side on co-flow diffusion flames. Both numerical and experiment results depicted that the flame length decreases by addition of diluent to the fuel stream in atmospheric pressure.…”

mentioning

confidence: 99%

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Vakilipour

Tohidi

Al-Zaili

et al. 2019

Appl. Math. Mech.-Engl. Ed.

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The turbulent combustion flow modeling are performed to study the impacts of CO 2 addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame SM1. A flamelet approach along with three well-known turbulence models are utilized to model the turbulent combustion flow field. The k−ω SST shows the best agreement with the experimental fields compared to other methods. Then, the k−ω SST is employed to study the effects of CO 2 dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO 2 dilution, a fictitious species is replaced with the regular CO 2 in both fuel and oxidizer streams.The results indicate that the flame temperature is decreased when CO 2 is added to either fuel or oxidizer streams. The flame length reduction is observed at all levels of CO 2 dilution. The H radical concentration indicating the flame strength decreases following by the thermochemical effects of CO 2 dilution processes. In comparison with fictitious species dilution, chemical effects of CO 2 addition enhance CO mass fraction. The numerical simulations show that by increasing the

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Numerical investigation on effects of fuel tube diameter and co-flow velocity in a methane/air non-premixed flame

Soloklou

Golneshan

2020

Heat Mass Transfer

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Effects of pressure and fuel dilution on coflow laminar methane–air diffusion flames: A computational and experimental study

Cited by 18 publications

References 59 publications

Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Numerical investigation on effects of fuel tube diameter and co-flow velocity in a methane/air non-premixed flame

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