NUMERICAL SIMULATION OF FLAME PROPAGATION NEAR EXTINCTION CONDITION IN A MICRO COMBUSTOR

Authors: Choi K.H.¹; Na H.B.²; Lee D.H.³; Kwon S.⁴

Source: Microscale Thermophysical Engineering, Volume 8, Number 1, January/February/March 2004 , pp. 71-89(19)

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Abstract:

In the present study, a numerical simulation of flame propagation and extinction in a micro combustor that is subject to excessive heat loss to the wall, particularly during flame propagation, is described. Heat loss to the wall was empirically modeled from measurement data on a similarly configured micro combustor. A PISO based numerical scheme was used for differencing the conservation equations. An H₂-air reaction mechanism involving 16 species and 10 reaction steps was used to approximate the combustion process. A cylindrical computation domain was used to simulate the experiments. The combustor volume has a small height to radius ratio and an axial gradient of properties can be significant. In the present study, however, axial gradients were ignored, leaving radius as the only spatial coordinate. Instead of evaluating heat transfer from the temperature gradient near the wall surface, an empirical bulk heat transfer coefficient was used to approximate heat loss to the wall. A comparison of the computation and measurements showed a good agreement in flame propagation speed and cooling process, after the flame had been quenched by an artificially imposed extinction condition.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/10893950490272948

Affiliations: 1: Namyang Research Center, Hyundai Motor Company 2: Korea Aerospace Research Institute 3: Center for Information and Electronics, Korea Advanced Institute of Science and Technology 4: Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Korea

Publication date: 2004-01-01

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NUMERICAL SIMULATION OF FLAME PROPAGATION NEAR EXTINCTION CONDITION IN A MICRO COMBUSTOR

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