The Research On Air Oscilatory Atomization Technology Of Spray Forming

In spray forming process, the size of the melt drops aerosol is one of most important standards of measuring deposition blank quality. Fining melt drops of aerosol size is one of hotspots in researching technical field. According to the smog of fluid flow theory, this paper proposes the fluctuation broken with oscillation gas atomization liquid metal, thus refining melt drops Using numerical simulation, experimental measurement, mechanism analysis and other ways, launched in researching air oscillation atomization technology.Finished the design of air oscillation device. This device can produce the frequency of l00Hz oscillations gas, which can change oscillation range by the size of the rotor blades. Through the experiments of pure Al atomization verified device applicability.Using CFD software, analyzed the oscillation gas flow structure. The results show that the flow field structure of oscillations gas had is similar with ordinary atomization gas, but the maximum speed in one cycle of oscillations gas flow field is less than that of the ordinary atomization flow field. The temperature of backflow zone is not obviously affected by gas oscillation. The most obvious influence in structure is the amplitude of gas, more higher amplitude, much more obvious changes of flow field in a cycle; and more higher frequency, much more obvious hysteresis in actual parameters than theory parameters.By atomizing the experimental observation, discovered that the most biggest influence of atomization quality is main pressure. The atomization will be ended or failed with increasing main pressure. For this paper, using injection forming machines, liquid metal can get sufficient atomization when the main pressure is 0.5MPa, The atomization is much better when the main pressure is 0.3MPa, amplitude is O.1MPa, frequency is 100Hz other than non oscillation of source gas, 0.3MPa of main pressure.Predicted the size of drop using DPM model, The results show that more finer drop can be got under oscillation source gas other than non oscillation source gas in certain parameters.Aiming at droplet size of numerical calculation results, the air source oscillation atomization mechanism is speculated that the position and time diversity which shockwave effect in fluid flow disturbances wave is the main reason of irregular changes of droplet size.