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Effect of pressure on the extinction, acoustic pressure response, and NO formation in diluted hydrogen–air diffusion flames by C.H Sohn; S.H Chung is a Engineering article available to read on EtoBox.

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Characteristics of extinction, acoustic response, and NO formation for diluted hydrogen-air diffusion flames at various pressures are investigated numerically by adopting a counterflow model. The results show that extinction can be classified into three regimes, where extinction strain rate increases with pressure at low pressures, decreases at moderate pressures, and increases again at high pressures. This behavior is caused by the variation of chemical kinetics with pressure. Reduced mechanisms are derived based on respective kinetic schemes. At a specified strain rate, peak flame temperature increases with pressure, then decreases, and finally increases again at high pressure. The mole fractions of major radicals H, O, and OH decrease monotonically with pressure, whereas that of HO 2 increases and then decreases at high pressures. Acoustic-pressure response based on the Rayleigh criterion shows distinct characteristics depending on pressure in each regime. At low pressures, pressure rise causes an increase in flame temperature and chain branching/recombination reaction rates. As a result, heat release increases, leading to an acoustic amplification. Similar phenomena are predict

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Author

C.H Sohn; S.H Chung

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0010-2180)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)