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The Effect of Swirl Number on the Flow Characteristics of Flat Flame Burner
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 Title & Authors
The Effect of Swirl Number on the Flow Characteristics of Flat Flame Burner
Jang, Yeong-Jun; Jeong, Yong-Gi; Jeon, Chung-Hwan;
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 Abstract
Burner of Flat Flame type expects the uniform flame distribution and NOx reduction. The characteristics of Flat Flame Burner become different according to swirl number in the burner throat. Experiments were focused on swirl effect by four types of swirler with different swirl numbers (0, 0.26, 0.6 and 1.24). It shows many different flow patterns according to swirl number using PIV(Particle Image Velocimetry) method. The flow of burner with swirler is recirculated by pressure difference between its center and outside. Recirculated air makes stable in flame, and reduced pollutant gas. In case of swirl number 0, main flow passes through axial direction. As swirl number increased, The backward flow develops in the center part of burner and Flow gas recirculates. This is caused by radial flow momentum becomes larger than axial flow by swirled air and the pressure at center drops against surrounding. As swirl number increases, the radial and axial velocity was confirmed to be larger than low swirl numbers. And turbulence intensity have similar pattern. The CTRZ(Central Toroidal Recirculation Zone) is shown evidently when y/D=1 and S=1.24. The boundary-layer between main flow and recirculated flow is shown that the width is seen to be decreased as swirl number increased.
 Keywords
Flat Flame Burner;PIV(Particle Image Velocity);Swirl Number;CTRZ;
 Language
Korean
 Cited by
1.
연소로 내 2차공기의 주유동 수직방향 선회분사로 인한 선회류가 스월수에 따른 가스 체류시간과 혼합 특성에 미치는 영향,박상욱;전병일;류태우;황정호;

대한기계학회논문집B, 2006. vol.30. 1, pp.48-56 crossref(new window)
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