variavel0=<b>Pedro Teixeira Lacava</b> - lacava@aer.ita.br Instituto Tecnológico de Aeronáutica
<b>Daniel Silva Ferreira</b> - daniel@lcp.inpe.br UNESP - FEG
<b>João Andrade de Carvalho Jr.</b> - joao@feg.unesp.br UNESP - FEG
<b>Marco Aurélio Ferreira</b> -  INPE
<b>Abstract.</b> Pulse combustion has gained interest in today’s research due to indications that its applications in energy generation may offer several advantages, such as: fuel economy, reduced pollutants formation, increase of convective heat transfer rates and investment reduction when compared with conventional techniques. An experimental study was conducted with the objective of investigating the emissions in the product gases in the combustion with acoustic oscillations. The studied gases were carbon monoxide and nitrogen oxides. The experiments were performed in a stainless steel vertical refrigerated chamber, with a length of 1m and an internal diameter of 25 cm. The fuel was liquefied petroleum gas (LPG). The combustor was operated in non pulsating and pulsating conditions, with the same mass flow rates of fuel and air. Part of the reactants mixture (premixed) was acoustically excited by means of a strategically positioned speaker, before the burner outlet section. The burner was aligned with the chamber axis and positioned at its bottom section. The experiments were performed for 0.16 g/s of LPG burning in three conditions: stoichiometric, 11 % air excess and 9 % air deficiency. Besides the gas analysis at the combustor outlet, a flame visual analysis was performed by means of a CCD chamber. A tomographic reconstruction routine was applied to the integrated images obtained during the experiments. The main conclusions were: a) the pulse combustion process produces a more uniform distribution of the fuel/air mixture; b) the presence of the acoustic field affects drastically the flame geometry and, as consequence, the pollutants emission rates.
<b>Keywords.</b> Combustion, Pulsating Combustion.