| Autor: |
Kwon Hyoung Choi, G., Han Bee Na, G., Dae Hoon Lee, Sejin Kwon, G. |
| Předmět: |
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| Zdroj: |
Microscale Thermophysical Engineering; Jan-Mar2004, Vol. 8 Issue 1, p71-89, 19p |
| Abstrakt: |
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 H 2 -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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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