Experimental And Numerical Study On Atomization Characteristics Of Low-Pressure Rotating Nozzle

The nozzle which had an impact on atomizer characters including atomization range and distance was the most important part of the atomizer. So it was quite vital for us to study atomization characteristic of nozzle to improve atomization effect of the atomizer. Based on an enterprise’s intermittent atomizer, this paper studied the problem when it sprayed.First of all, this paper introduced research status and spray testing technology of the low pressure rotating nozzle, gave the research methods and technical route of the topic. The paper also analyzed atomization mechanism, jet theory, evaluation target and testing methods of low pressure rotating nozzle. Moreover, the paper put forward a spiral groove swirl nozzle, designed structure of core and core coat of the nozzle, and confirmed the size parameters of the nozzle, those nozzles were manufactured by the SLA method. At the same time, this research set up an experimental platform, and designed an experimental test system. Thus, this paper had experimental research about atomization angle, distance, particle uniformity and spray strike-target problems, respectively. The experiment gained the nozzle structure parameters which can make nozzle have better atomization effect, and spray particle situation, and the best distance between the target and nozzle exist.Afterwards, this paper analyzed theory basement of internal and external flow field of the nozzle, and established finite element models of internal and external flow field of the nozzle. At the same time, the paper had numerical simulations about internal and external flow field by using FLUENT software. After that, FLUENT derived nozzle outlet velocity vector of inner flow field for profile files that were applied to boundary conditions of outer flow field, which made internal and external simulation have continuity. Internal flow field had simulated and analyzed velocity field, spray angle and pressure field of the nozzle. And, the internal flow field simulation had gained the nozzle structure parameters that had an impact on velocity field and spray angle. At the same time, the external flow field simulation had analyzed the spray particle speed and diameter.In the end, this paper compared numerical simulation results and experimental results, and analyzed the relationship between them, got the research conclusion Therefore, the research provided design reference for the domestic atomizer.