연소효율 개선을 위한 스월제트의 난류유동 특성에 관한 연구 = Contributed A Study on the Turbulent Flow Characteristics of Swirl Jets for Improvement of Combustion Efficiency

다국어 초록 (Multilingual Abstract)

Swirl flow in the gun type burner has a decisive effect on the stabilization of the flame, improvement of the combustion efficiency, and also a reduction of NOx. This swirl flow is created by the spinner which is inside the airtube that guide the combustion air. Gun type burner has generally the inner devices composed nozzle adapter, spark gap ignitor, and spinner. These inner components change the air flow behavior passing through air tube. Meanwhile, turbulent characteristics of this air flow are important to understand the combustion phenomena in the gun type burner, because the mixture of fuel and air are depended on. However, nearly all of the studies have been analyzed the turbulent flow of simplified combustion formation without the inner devices. So, this study conducted the measurement using by hot-wire anemometer and analyzed turbulent flow characteristics of the swirl flow discharged from the air tube with inner devices. Turbulence characteristics come up in this study were turbulence intensity, kinetic energy and shear stress of the air flow with the change of the distance of axial direction from the exit of the air tube.

참고문헌 (Reference)

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4 S. Hoffmann, "Results of Experiments and Models for Predicting Stability Limits of Turbulent Swirling Flames" 120 : 311-316, 1998

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6 J. M. Beer, "Combustion Aerodynamics" 1974

7 Örlü Ramis Alfredsson, "An Experimental Study of the Near-Field Mixing Characteristics of a Swirling Jet" 80 (80): 323-350, 2008