Transient ellipsoidal combustion model for a porous burner in microgravity
Autor: | Akshit Markan, Peter B. Sunderland, John L. de Ris, Howard R. Baum, James G. Quintiere |
---|---|
Rok vydání: | 2020 |
Předmět: |
Materials science
Steady state 010304 chemical physics General Chemical Engineering General Physics and Astronomy Energy Engineering and Power Technology 02 engineering and technology General Chemistry Mechanics Ellipsoidal coordinates Combustion 01 natural sciences Fuel Technology 020401 chemical engineering 0103 physical sciences Heat transfer Combustor Transient (oscillation) Zero gravity 0204 chemical engineering Axial symmetry |
Zdroj: | Combustion and Flame. 212:93-106 |
ISSN: | 0010-2180 |
DOI: | 10.1016/j.combustflame.2019.09.030 |
Popis: | The current study develops a transient combustion model formulated in oblate ellipsoidal coordinates to analyze the behavior of non-buoyant burner-generated diffusion flames. The combustion model is axially symmetric and considers a porous gas-fueled burner called the Burning Rate Emulator (BRE), which is idealized as an ellipsoidal disk. An approximate analytical transient solution for the flame shape and heat transfer to the surface of the burner is generated as a product of the exact steady-state result and the asymptotic transient result that becomes exact far from the burner. Microgravity BRE experiments conducted at NASA Glenn's 5.18-s Zero Gravity Research Facility indicated the evolution of an approximately ellipsoidal flame moving away from the burner with steady state not achieved during the 5-second test period. The microgravity experimental results are shown to be in good agreement with the mathematical model, which can help predict the flame behavior beyond the duration of the test. |
Databáze: | OpenAIRE |
Externí odkaz: |
načítá se...