Transition of Propagating Triple Flames to Burner Attached Flames in an Axisymmetric Jet

Qin, X.; Choi, Chun W.; Mukhopadhyay, Achintya; Puri, Ishwar K.; Katta, Viswanath R.

doi:10.2514/6.2002-4023

Cited by 2 publications

(2 citation statements)

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“…Qin et al [16] indicated that around the triple point there exists a region where Lewis number is less than unity. Since the reactant diffusivity in this case is greater than that of heat, the focusing of reacting species overrides the defocusing of heat near the flame front.…”

Section: Introductionmentioning

confidence: 98%

“…The feature of enhanced flame speed (relative to the laminar stoichiometric burning velocity) distinguishes the triple flames in comparison with the premixed flames. Qin et al [16] indicated that around the triple point there exists a region where Lewis number is less than unity. Since the reactant diffusivity in this case is greater than that of heat, the focusing of reacting species overrides the defocusing of heat near the flame front.…”

Section: Introductionmentioning

confidence: 99%

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NO_x emission performance of triple flames

Kamal

2007

Proceedings of the Institution of Mechanical Engineers, Part A:

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A numerical study was performed to address the NO x characteristics of both normal and inverse triple flames in comparison with non-premixed and partially premixed flames. The cross-flow was found to shorten the triple flames and to raise the combustion efficiency of normal and inverse triple flames by about 12.1 and 7.2 per cent, respectively. With a cross-flow, the inverse triple flames experienced shorter flame lengths and subsequent lower NO x concentrations than those produced by either partially premixed or non-premixed flames. For inverse triple flames, increasing the lean mixture momentum and decreasing the rich mixture jet velocity together with increasing its premixing degree led to a reduction in the flame length and in both thermal and prompt NO x emissions. The increase in the lean equivalence ratio or its diffusive area split the flame high NO x concentration region and reduced the peak concentration, while increasing the radial inward entrainment reduced the NO x concentrations further. The results were experimentally verified using a slot burner, whereby the flame lengths and NO x emissions were fairly reproduced. The results indicated that triple flames can be widely used in industrial burners at various operating conditions.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%