A numerical study of localized pulsed energy deposition in stagnant air and high speed airflows
André Carlos Fraile Júnior1; Mauricio Antoniazzi Pinheiro Rosa1
1 Instituto de Estudos Avançados
doi:10.20906/CPS/COB-2015-0119
Resumo
Energy deposition to high speed airflows is widely studied in applications such as wave drag reduction, optimization of scramjet inlets, sonic boom mitigation, ignition of a combustible gas mixture and so on. This work presents a numerical analysis of pulsed energy deposition as a localized heat source in stagnant air and in uniform supersonic airflows. Firstly, it was performed a detailed study concerning the choice of numerical methods in the Fluent code and mesh sizing. Next, for verification of the methodology, results were compared with available numerical results in the literature. Next, it was performed a parametric analysis, for single and multiple pulse heat sources, of the effects of the heat source on the flow pressure, temperature and Mach number when pulse duration, source size, energy deposition rate and pulse frequency are varied. Results have shown that increasing the energy deposition rate and pulse duration has the effect of pronouncing flow changes such as the temperature increase and Mach number and density decrease along the source axis. These effects are more significant for lower free stream Mach number, which is related to the fluid transit time along the energy source region.
Palavras-chave: energy addition; flow control; supersonic flow