Stability of lifted flames in centerbody burner

Katta, Viswanath R.; Stouffer, Scott D.; Roquemore, W. M.

doi:10.1016/j.combustflame.2010.10.022

Cited by 8 publications

(6 citation statements)

References 38 publications

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“…OH has been commonly cited in previous investigations to display the dimensions and location of the flame reaction zone either in experimental studies with PLIF visualization techniques or numerical simulations. , For instance, the x OH = 0.0005 contour was found to coincide well with the flame boundary as well as the blue luminous region in an experimental work of Katta et al Simultaneously, Kang et al confirmed the findings in experimental and numerical tests. The x OH = 0.0005 iso-line is also adopted to represent the reaction zone boundary in the present work, which is marked by an orange dashed line, as shown in Figure a, and the area between x OH = 0.0005 can be viewed as the reaction zone.…”

Section: Resultsmentioning

confidence: 65%

“…A roughly linear relationship is established for the reaction zone length, which varies with the DME blending ratio, and is indicated by the orange dashed line in Figure 6a. According to the analysis of Katta et al 54 54 the flame outer (inner) boundary L out (L in ) is defined as the outer (inner) x OH = 0.0005 iso-line, the flame length L f is equal to L out . The length of the reaction zone L R corresponds to L out − L in .…”

Section: Table 2 Fitting Function Parameters For Normalized Reaction ...mentioning

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: 65%

Section: Table 2 Fitting Function Parameters For Normalized Reaction ...mentioning

confidence: 99%

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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“…This is reasonable since OH is the dominant oxidizer and it is always accompanied with the fuel oxidation process. For instance, Katta et al [44] found that the iso-contour of X OH = 0.0005 agreed well with the border of the flame surface and the blue luminous zone in their experimental observation. Additionally, this point was also validated in a previous study [15].…”

Section: Casementioning

confidence: 50%

“…In previous studies, OH was often used to display the dimension and location of the flame reaction zone, either for experimental investigation based on the laser-induced fluorescence (LIF) visualization technique [47] or for the numerical modeling [15,44]. This is reasonable since OH is the dominant oxidizer and it is always accompanied with the fuel oxidation process.…”

Section: Casementioning

confidence: 98%

“…As shown in Fig. 3, the results (such as the predicted temperature and flow fields, and the iso-contours of X OH = 0.0005 which was suggested as a reasonable indicator for the border of the reaction zone [15,44]) for the two distinct meshes were kept within high consistency. Finally, the primary mesh was used for simulating all the other cases of flames.…”

Section: Simulation Detailsmentioning

confidence: 99%

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