콘형 배플판을 갖는 Gun식 가스버너의 난류유동장에 대한 슬릿과 스월베인의 역할

The Role of Slits and Swirl Vanes on the Turbulent Flow Fields in Gun-Type Gas Burner with a Cone-Type Baffle Plate

The gun-type gas burner adopted in this study is generally composed of eight slits and swirl vanes. Thus, this paper is studied to investigate the effect of slits and swirl vanes on the turbulent flow fields in the horizontal plane of gas swirl burner with a cone type baffle plate measured by using X-probe /Tom hot-wire anemometer system. This experiment is carried out at flow rate 450 ℓ/min in the test section of subsonic wind tunnel. The axial mean velocity component in the case of burner model with only swirl vanes shows the characteristic that spreads more remarkably toward the radial direction than axial one, it does, however, directly opposite tendency in the case of burner model with only slits. Consequently, both slits and swirl vanes composing of gun-type gas burner play an important role in decrease of the speed near slits and increase of the flow speed in the central part of a burner because the biggest speed spurted /Tom slits encircles rotational flow by swirl vanes and it drives main flow toward the axial direction. Moreover. the turbulent intensities and turbulent kinetic energy of gun-type gas burner are distributed with a fairly bigger size within X/R<0.6410 than burner models which have only slits or swirl vanes because the rotational flow by swirl vanes and the fast jet flow by slits increase flow mixing, diffusion, and mean velocity gradient effectively.