Characteristics of NH3/H2/air flames in a combustor fired by a swirl and bluff-body stabilized burner

Franco, M.A.; Rocha, Rodolfo C.; Costa, Mário; Yehia, Mohamed

doi:10.1016/j.proci.2020.06.141

Cited by 69 publications

(39 citation statements)

References 24 publications

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“…Partial premixed combustion model with flame-let concept was selected. Validation for the predicted results with experimental data [37] showed a great agreement when compared with the measured experiments. Moreover, the influence of changing various parameters on emission characteristics is also discussed.…”

Section: Introductionmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 89%

“…The predicted results are firstly validated with experimental data [37] for cases of different concentration of NH3 and at equivalence ratio as shown in Table 1. The dry volumetric emissions of O2 and NOx are validated with the experimental data [37] as shown in Figure 5 and 6 respectively.The axial temperature is validated with the experimental data [37] that shown in Figure 8 to present agreement with experimental one (Figure 7) [37] except in the location of entrained mixture from the annuals due to the increasing of mixing at this locations. Enhancement of the mixture mixing and the stability of the flame in the burner is due to the effect of tangentially entrained air and the introduced bluff body that leads to generation of internal recirculation zone at the combustor region where the temperature increases and then the dilution occurred and the temperature then decreased till to reach outer recirculation zone.…”

Section: Resultsmentioning

confidence: 89%

“…To attain improved mixing and flame stability, the burner combines air swirl with a bluff body. The 1.9 kW capacity burner shown in Figure 1 utilized in the present study is a swirl-stabilized ammonia/hydrogen mixture used in the study of Costa, et al, [37]. Figure 4 shows 2D axisymmetric geometry for combustion chamber.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…Fig. 7.Comparison of the experimental data[37] and calculated O2 at the center of the combustion chamber…”

mentioning

confidence: 99%

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A Numerical Prediction of Stabilized Turbulent Partially Premixed Flames Using Ammonia/Hydrogen Mixture

Medhat

Yehia

Khalil

et al. 2021

ARFMTS

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The objective of this work is to computationally assess the performance of a carbon free ammonia-hydrogen mixture when burnt in a gas turbine like combustor. Recently, utilizing ammonia as an alternative carbon-free fuel for future power, industry applications and achieving clean energy attracted enormous interest. Pure ammonia oxidation is facing many challenges such as high NOx emissions, high ignition energy, slow reactivity and lower laminar flame speeds. Therefore, the use of ammonia/hydrogen mixture provides flame stability and increasing flame speed. In this manuscript a numerical study for a new swirl stabilized combustor for oxidizing ammonia/hydrogen mixture. Numerical two dimensional model simulations of a turbulent flame on Reynolds Averaged Navier Stokes (RANS) including a realizable k-e turbulent scheme with the aid of chemistry mechanism were performed under various conditions. Partially premixed combustion model with flame-let concept was selected and radiation effects are also considered. Validation for the predicted results showed a reasonable agreement when validated with the experimental data. The results discuss the influence of changing inlet pressure and equivalence ratio on the stability and the characteristics of unburnt NH3 and NO emissions. Results show that for constant operating conditions such as constant equivalence ratio of 0.8 that increasing hydrogen content resulted in increasing NO emission. Also, for constant ammonia/hydrogen concentrations, NO emissions increases with equivalence ratio then reduced at rich conditions and NH3 emissions are generally low. Equivalence ratio lower than 1.2 will be preferable to reduce the amount of unburnt NH3 formation.

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Section: Introductionmentioning

confidence: 57%