Pengaruh Lip Thickness Turncated Nozzle Sudut Luar terhadap Karakteristik Api Difusi Concentric Jet Flow

Abstract

Diffusion combustion is a daily combustion process where is often used primarily in industrial systems. An optimal burner design is needed to get more efficient combustion results. Then the shape of the burner nozzle greatly affects the turbulence between the fuel and air which forms the flow recirculation zone. The flow recirculation zone functions to produce homogeneous mixing and get a more perfect combustion. Recirculation zones are formed to disrupt flow rates, causing vortices and backflow around the end of nozzle. This research uses burner concentric jet flow. The lip thickness of the outer angles turncated nozzle are used 16 mm, 12 mm, 8 mm, 4 mm, and 0 mm length variation To obtain flame stability, the lift off and blow off limits are used with variations in air velocity. Thermocouples are used to measure the flame temperature distribution. The numerical simulations are used to reinforce this study. The results showed that the characteristics of the concentric jet flow diffusion affected by the use of the lip thickness of the outer angles turncated nozzle. The highest concentric jet flow diffusion stability is at 16 mm nozzle. The highest concentric jet flow diffusion temperature is at 12 mm nozzle. Experimental and numerical simulations show the perfect combustion on the 12 mm lip thickness nozzle. This can be seen by direct photographs of blue-dominated flames and the visualization of the temperature contour distribution which is dominated by red.