A Study on the Influences of the Scale of Turbulence on the Burning Rate in a Vessel

Abstract

The turbulent flame propagation in a closed vessel is different from that of the burner flame with a steady constant flow in respect of fluctuation of flow component considered the main flow. In the flow field of this kind, as the flame front becomes very irregular, it is difficult to define the burning velocity corresponding to the space displacement of the apparent flame front. Defining the pressure increasing rate as burning rate, the effects of intensity and scale of turbulence on this burning rate in the combustion vessel are investigated with a recirculating jet flow through four perforated plates. From observations of flames and measurements of pressure rise in the vessel, it may be concluded that the reaction zone of turbulent flame diffuses to a considerable depth from the apparent flame surface and the scale of turbulence accelerates or retards the burning rate on account of instability of flame front.