Experiments And Simulation On The Effervescent Atomizer

Relative to other atomization method, effervescent atomization is a new type of atomization. There are advantages of effervescent atomization like high atomization quality, low required pressure, low air consumption, energy saving, simple and reliable and so on. For now, effervescent atomization has a very wide range of applications in internal combustion engines, industrial boilers, gas turbines, pharmacy and waste incinerator, etc. In order to expand the scope of effervescent atomization, applications in cool-down areas have been studied in this paper. Through a combination of numerical simulation and experimental methods, spray characteristics at low flow, low-power conditions of effervescent atomization have been studied.This paper presents three effervescent atomization with different internal structure. The nozzles related data measured by the establishment of a special bench. Effervescent atomization nozzles flow characteristics, spray angle, spray three-phase velocity, and droplet diameter were studied experimentally, and the results were analyzed. For the result that different internal structures lead to different effects of the spray nozzle, three kinds of nozzles have been modeled, and the internal flow have been simulated. This paper analyzed the impact of the internal structure of the two-phase mixture.By analyzed the spray effect of effervescent atomization, This paper argues that inside the nozzle structure, Gas-liquid mass flow ratio, work pressure and other factors have a great impact in nozzle atomization characteristics. More reasonable structure inside the nozzle, the higher the degree of mixing of gas and liquid, the more uniformly mixed, and the better the quality of atomization nozzle. In a larger gas-liquid mass flow ratio condition, the average droplet diameter is small. With the improvement of the gas-liquid mass flow ratio, the average droplet diameter’s reduced speed continuously slow down. In the nozzle operating parameters, as the working pressure increases, the average droplet diameter is decreasing, but the decreasing trend is not obvious. Under certain conditions, the spray exist a atypical velocity distribution that center speed is not attenuated. The internal structure of the nozzle having a huge impact to the impact of nozzle energy consumption has been considered in this paper. This finding has important implications for the future design of new nozzles.