ガンタイプバーナにおける噴霧と流れ場との相互作用

抄録

In this paper, we describe experimental results of the spray of an industrial oil burner obtained using phase Doppler anemometry. The burner is a gun-type burner whose flame is stabilized by a baffle plate. The measurements were carried out near the burner throat in the cold condition. The purposes of this study are to elucidate the interaction between turbulent air flow and spray, and to present basic data for numerical modeling. Two-dimensional distributions of velocity vectors, dispersion, droplet Reynolds numbers and mass flux were obtained in the experiments. The results show that the behavior of the droplets in the spray can be classified into three patterns by the droplet diameters. The particles with diameter smaller than 30μm show fluid motion and the particles with diameter larger than 50μm penetrate the turbulent air flow. The spray with droplets larger than 70μm in diameter forms a hollow cone distribution, which induces shear flow along the spray. Then the shear generates turbulence and the small droplets are drawn inside the hollow cone.