The experimental study on characteristics of a swirl pressure nozzle was carried out with the water as the working fluid of atomization. The experiments show that the working fluid pressure and the size of the nozzle aperture have effect on the nozzle flow capacity, the droplet size and its distribution, the spray angle and the radical distribution of the spray flux. The droplet size and spray angle will decrease with the increase of working fluid pressure, but the decreasing rate becomes lower when the fluid pressure reaches a certain amount. The nozzle flow capacity increases with the fluid pressure too, but the increasing will be slower when the pressure increases to a certain amount. In the experiments, most of the droplet sizes are in the range of 80-200μm, and the distributions of the droplet size are in a relatively narrow range. Usually the radical spray flux of the swirl pressure nozzle is biggest at the center region of the atomization cone and it decreases with the increase of the spray pressure, while the spray flux on the margin of the atomization cone increases. The research provides an experimental basis for the industrial design of swirl pressure nozzle.
Journal of Chemical Engineering of Chinese Universities