Simulation Study on the Design-number of Twin Vane Spin Core Nozzle

Abstract

When designing twin vane spin core water atomizing nozzle, it should have an appropriate ratio between the cavity aperture and the exit diameter of nozzle, we call it design-number. It not only affects the spray spread angle, also affects the flow passage size of the nozzle internal at the spin core. Analysis by synthesis, the ratio selected 4.1 is able to combine these two factors. At this point, the lateral dimension of the internal spin channel is not less than the exit diameter. With CFD numerical simulation infer the spray spread angle can reach about 50. The design-number of 4.1 may be taken as design dimensionless number of tiny exit diameter nozzle. Further simulation study shows that in the same of the nozzle cavity aperture, with the nozzle exit diameter increases, the spray spread angle increases, it is approximately direct proportion to the nozzle exit diameter within the range of 1~2.5mm. Testing 1.5mm and 2.0mm exit diameter nozzle, it confirms the simulation results. Key words-Twin vane spin core; Spray spread angle; CFD simulation