A numerical study on combustion characteristics of blended methane-hydrogen bluff-body stabilized swirl diffusion flames

Kashir, Babak; Tabejamaat, Sadegh; Jalalatian, Nafiseh

doi:10.1016/j.ijhydene.2015.03.023

Cited by 36 publications

(27 citation statements)

References 31 publications

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“…At x/d = 1.4, the axial velocity is between −0.0281 m/s and −0.119 m/s in r/d ∈(0, 0.04), indicating that the incipient part of SRZ can be captured, whereas the numerical values remain a little over-predicted and the dimensions of SRZ are understated. Kashir et al 29 suggested that the calculation errors in RANS could be attributed to an inherent shortcoming in simulation of shear flow. Meanwhile, a good prediction of the calculated values for the RANS model has been recorded in the region away from the shear flow, where the average relative error does not exceed 11% compared with experimental measurements (10.853%, 4.312%, 3.408%, and 10.586% for x/d = 0.136, 0.4, 0.8, and 1.4 in 0.55 < r/d < 0.8 zones, respectively).…”

Section: Resultsmentioning

confidence: 99%

“…To enable fuel and swirl air stream to be fully developed through the tube, these inlets are shifted 50 mm upstream; such an approach has been applied in Yang et al’s and Kashir et al’s previous work. 27 , 29 …”

Section: Computational Domain and Conditionsmentioning

confidence: 99%

“…They found that the C var number was an effective factor that affected the local extinction phenomenon in the steady flamelet model (SFM). A dynamic second-order moment closure combustion model of LES was validated with a CH 4 swirl flame (SM1) by Luo et al, 28 Kashir et al, 29 and Rohani and Saqr 30 numerically presented the combustion characteristics for adding H 2 and varying swirl numbers in the SM1 flame. A conditional moment closure (CMC) model was used by Roy and Sreedhara 31 to evaluate the flame structure and global NO emissions of CH 4 and DME in an exhaust gas recirculation (EGR) environment.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Yuan

et al. 2021

ACS Omega

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The C 1ε = 1.6 standard k – ε equation combined with the steady flamelet model was applied to a methane/dimethyl ether swirl combustion field, and the effects of the dimethyl ether (DME) blending ratio and operating pressure on the flame behavior, including species variation, reaction zone behavior, and flame entrainment, were investigated. The results demonstrated that selected models could better reproduce the trends of the experimental measurements. The downstream reaction zone achieved better calculation accuracy than the outer shear layer of the first recirculation zone. The addition of DME accelerated the accumulation process of H 2 , O, H, and OH radicals. The intermediate radical CH 2 O was rapidly developed by the influence of the H extraction rate under a constant fuel volume flow rate. The reaction zone dimensions were approximately linearly and positively correlated with the DME blending ratio, whereas flame entrainment expressed a lower DME concentration dependence in the high-DME mass-dominated system. The operating pressure significantly impacted the distribution of reactive radicals in the turbulent flame; meanwhile, the flame and reaction zone length showed nonlinear inverse behavior with pressure variation, while the thickness of the reaction zone was always linearly and negatively correlated with pressure. Moreover, the peak flame entrainment rate also experienced a nonlinear decline with pressure elevation; however, the peak positions were not sensitive to pressure fluctuation. Concurrently, the response surface functions for the reaction zone dimensions were established covering the range of 0–1 for the DME blending ratio and 1–5 atm operating pressure, which could provide assistance for combustion condition optimization and combustion chamber design.

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Section: Resultsmentioning

confidence: 99%

Section: Computational Domain and Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Yuan

et al. 2021

ACS Omega

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“…Since current studied flame structure has an hourglass shape in higher swirl numbers (s g =0.6), the furthermost point of stoichiometric mixture fraction is not always on the centerline. In this regard, the flame length is defined as the highest axial distance between the fuel exit plane (bluff-body surface) and the place where the mixture fraction reaches to its stoichiometric ratio [41].…”

Section: Dilution Effectsmentioning

confidence: 99%

“…It is noteworthy to mention that the selection of an appropriate turbulence model plays a major role in the simulation of swirling flames. Some researchers focus on the numerical methods with reasonable calculation time and cost that are able to capture the main characteristics of flow fields along with the distribution of major and minor species [40,41,42,43,44,45]. In this regard, Reynolds-averaged Navier-Stokes (RANS) turbulence models have shown acceptable levels of accuracy in the prediction of main flow features, and their results for mean values are comparable with more complicated turbulence models like Large Eddy Simulation (LES) [46].…”

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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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Introduction

Nemitallah¹,

Habib²,

Badr³

2019

Oxyfuel Combustion for Clean Energy Applications

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A numerical study on combustion characteristics of blended methane-hydrogen bluff-body stabilized swirl diffusion flames

Cited by 36 publications

References 31 publications

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

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

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