Experimental and numerical studies of gasoline-ethanol blends in a counterflow premixed flame
Claudio Torres1; Dario Alviso1; Juan Carlos Rolon1; Rogerio Goncalves dos Santos2; Philippe Scouflaire3; Nasser Darabiha3
1 Laboratorio de Mecánica y Energía, Facultad de Ingeniería, Universidad Nacional de Asunción, Paragua; 2 Faculdade de Engenharia Mecanica, UNICAMP, Brasil; 3 Centrale Supélec, Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion (EM2C), Grande
doi:10.20906/CPS/COB-2015-0695
Resumo
Ethanol is a renewable, biodegradable, non-toxic fuel that can be produced from plants such as corn, sugar cane, beets, etc. In Paraguay, gasoline is blended with ethanol (E24, 24% ethanol), and currently a legislation for the use of E100 (100% ethanol) is being evaluated in Congress. Most of experimental studies of real fuels blends combustion are performed using internal combustion engines, in order to characterize the emission and performance of the engine. Fundamental study related to the combustion of these fuels blends is still scarce in literature. From the numerical point of view, many studies are performed using homogeneous reactors. However, mainly due to the complexity of their chemical composition, there are only few studies on kinetic modeling of such fuels blends. This paper presents experimental and numerical studies of gasoline-ethanol blends combustion in laminar counterflow premixed flames configuration. The key objective of the study is to understand the flame structure of different gasoline-ethanol blends and validate the kinetic models used in the simulations. The experiments were carried out in a counterflow burner. A mixture of gasoline-ethanol/air flow is injected from the lower and the upper side of the burner, forming two premixed flames. A spring jet particle seeder is used to pulverize the liquid fuel. The chemiluminescence of the excited radicals CH*(A2) and C2*(d3) are studied experimentally by emission spectroscopic techniques. The objective is to determine the relative concentration of excited radicals emission of gasoline-ethanol blend flames. Opposed flames have a slight curvature, which creates in the line of sight of the camera an integrated signal. To obtain the profile in the center plane of the flame, we apply a numerical tomographic technique, the Abel inversion of the integrated 2-D image captured with the ICCD camera/lens assembly. Narrow-band interference filters were interposed along the optical path to capture the CH* and C2* emissions. An estimation of the te
Palavras-chave: Ethanol; Kinetic Modeling; Counterflow; Premixed flames; Gasoline