噴霧流中の液滴の挙動および空気流に関する研究 : ホローコーン噴霧流

概要

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Studies were made on the behavior of droplets and the air flow in a hollow-cone spray, paying attention to the hollow-cone liquid sheet formed at the atomizer orifice. The shape of the liquid sheet was investigated by taking photographs with a flush of Nd-YAG pulse laser. Numerical simulation was carried out based on the transient Eulerian equations for the gas and the Lagrangian equation for the droplets. The averaged shape of the liquid sheet was incorporated in the simulation. Predicted results were compared with previous experimental data. It was revealed that simulation gives good prediction by considering the existence of the liquid sheet. Predicted results suggest that the movement of the liquid sheet induces strong air stream and that this air stream selectively transports small droplets and plays an essential role in classification of droplets by size. Accordingly, the existence of the liquid sheet is significant for the dispersion of droplets. In addition, the evaluation of the shape of the liquid sheet based on a simplified equation of motion suggests that the shape of the liquid sheet is predominated by the surface tension of the liquid.
一般社団法人日本機械学会の論文
1994-11-25