Heat Transfer Investigation from a Pre-mixed Swirling Hydrocarbon Flame in small combustion chamber

The heat transfer rates from a swirling premixed hydrocarbon flame to the walls of a small combustion chamber over a moderate range of Reynolds numbers, fuel/air equivalence ratios, and swirl intensities was examined experimentally. The experimental data indicate that the swirling premixed hydrocarbon flame increases the heat transfer rate to the combustion chamber walls as much as 80 percent compare to Non-swirling one. It also indicated that in non-recirculating swirl flames, the geometrical swirl number has the most effect, the Reynolds number has less effect and the fuel/air equivalence ratio has the least effect on the heat transfer rate to the combustion chamber walls. Observation from the flow visualization indicated that the flame shape was significantly distorted due to tangential velocity from a cone shape to a pyramid shape with a square cross section at weak swirl intensity and low burner Reynolds number. The flame shape then again changes from a pyramid shape to a cylindrical shape at moderate and high swirl intensity.

کلیدواژه ها:

Heat transfer ، Swirling flame ، Premixed Hydrocarbon flame ، Swirl