A one-dimensional model of piloted ignition

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Combustion and Flame; (USA)

DOI:https://doi.org/10.1016/0010-2180(90)90054-U· OSTI ID:6946101

Tzeng, L S; Atreya, A; Wichman, I S ^[1]

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1. Michigan State Univ., East Lansing, MI (USA). Dept. of Mechanical Engineering

In this article a model of piloted ignition is analyzed. The two-dimensional coupled solid and gas phase problem is simplified by assuming that the mass evolution rate from the combustible solid is a known function of time and by employing a plane rather thana point ignition source. Thus only a transient one-dimensional analysis of the gas phase is necessary. The equations are solved numerically using a fast scheme especially suitable for combustion problems. The pilot flame is modeled as a thin blab of gas that is periodically raised to the adiabatic flame temperature of the stoichiometric mixture. The effects of ignition source location, fuel mass evolution rate from the surface, and surface temperature of the solid are investigated. An explanation is offered for the preignition flashes often observed experimentally. A rational criterion for positioning of the pilot flame is proposed. The minimum fuel flow rate, by itself, is found insufficient for predicting the onset of piloted ignition; heat losses to the surface play an important role. Also, the conditions at extinction of a steady diffusion flame are found to be very similar to those for piloted ignition.

• OSTI ID: 6946101
• Journal Information: Combustion and Flame; (USA), Journal Name: Combustion and Flame; (USA) Vol. 80:1; ISSN 0010-2180; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
DIFFUSION
DISPERSIONS
ENERGY LOSSES
EQUATIONS
FLAMES
FLUIDS
GASES
HEAT LOSSES
LOSSES
MIXTURES
ONE-DIMENSIONAL CALCULATIONS
SLABS
SOLIDS
STOICHIOMETRY
SURFACES
TEMPERATURE GRADIENTS