Effect of Fuel and Air Injection Pattern on Combustion Dynamics in Confined and Free Diffusion Flame
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 2
Abstract
Abstract: A new burner is developed and its performance is experimentally studied. The principle of this new burner, circumferential alternative air and fuel burner (CAFB) is to admit fuel and air circumferentially alternative patterns. This burner also allow for swirling both fuel and air jets injecting from different circumferential holes. The outlet angle of air and fuel jet is changed between 0, 15, 30, 45 and 60 injection angles. A new definition and number for swirl is defined, this is called the Injection Swirl Number (ISN) and found to be accurate to describe the flame characteristics. Complete test rig was developed to facilitate characterization of the new burner. A new micro controller traverse mechanism was programmed and fabricated to control the sensitively moving of the thermocouple and gas analyzer sampling probe in all directions. Measurements of gas temperature at different positions, and the oxygen concentrations at the flame centerline were made. The thermal and chemical flame heights were obtained from the maximum temperature and oxygen concentration at the flame centerline. The visible flame height was obtained from direct photography and Infrared (IR) radiometry. The vortex breakdown creation period as a results of a high intensity swirling flow were been captured by the infrared radiation camera. Comparisons of the new CAFB with other flames have also been performed. Experiments showed that the flame height decreases with the increase of the injection jet angles which improves the mixing between air and fuel generating an intense combustion zone and, hence, shortens the flame length. A new injection swirl ratio has been introduced for the new CAFB burner namely the injection swirl number (ISN), ISN = tan θ, where θ is the injection angle. The injection swirl number (ISN) used is 0, 0.26, 0.58, 1 and 1.75 which corresponding to the injection angles 0, 15, 30, 45 and 60 degree respectively. An empirical correlation has been derived for the new CAFB burner flame length as a function of the new derived (ISN).
Authors and Affiliations
M. A. Abdel-Al
Keywords
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