Thermal Radiation Characteristics of a Cylindrical Hybrid Porous-Microchannel Counterflow Burner

Abstract

In this work a novel burner configuration is proposed as a hybrid concept of counterflow microchannel and cylindrical porous combustor. The fresh mixture is supplied from the ends of two microchannels aligned along the axis of symmetry with a gap between them, through which the combustion products are exiting. This capillary system is encircled by a porous media made of zirconium grains placed in a quartz tube. Thus, the flow of hot combustion products is reverted and preheats both the porous cylindrical layer and supply tubes. It is found that the heat recuperation allows to steady burn propane–air mixture with variation of the flow rate in an order of magnitude. The heat released from the chemical reaction is effectively converted into the thermal radiation flux, the power and spectral characteristics of which are studied. It is demonstrated that with the use of auxiliary optical system the power density can reach several units of W/cm². The possible applications of the proposed configuration to lasing and thermophotovoltaic applications are discussed.