チューブ型ガスバーナー内流れの理論モデル

抄録

In a tube-type gas burner, which is commonly used in a baking process, the pressure in the burner tube decreases by friction loss, but the outflow from the nozzle along the burner tube decelerates the flow in the tube and thus increases the pressure. The pressure distribution along the tube depends on the combination of these two opposite effects, and the resulting pressure sometimes gives the non-uniform flow from the nozzle, which causes uneven flame along the burner. In this study, the flow inside the buner is theoretically modeled. The goverinig equations are the conservation of mass and energy in the burner tube, and the outflow from the nozzle is calculated with the loss coefficient of the nozzle. The result of the theoretical model shows that the non-uniformity in the nozzle flow depends mostly on the tube length and the loss coefficients. The result of the model agrees with experimental and computational results.