Narrow Results

For deepen the understanding of the mechanism of effervescent atomization: it is necessary to have a better observation on the gas-liquid flow near the exit orifice. Both image and acoustic ways were introduced to observe the gas-fluid flow by a transparent effervescent atomizer. The results show that: It can be clearly seen from images that internal flow regimes make great influence on the spray behavior. Spray acoustic observation is an effective way to grasp the gas-liquid two phases flow behavior when they ejecting from the exit orifice. The acoustic analyzing in time and frequency domain has the ability to obtain the discrete phenomenon existing in effervescent sprays, in thus way, acoustic features could give a new perspective on effervescent spray over time. What's more, the discrete phenomenon in dilute bubbly flow and slug flow can be easily captured from after acoustic analyzing. Uniform two-phase distribution of internal flow shows continues acoustic performance after observing the homogeneous bubbly flow and chum flow.

Three-dimensional numerical analysis on gas-solid two phase flows in flow channel of throwing snow head was simulated by CFD (computer fluid dynamics). Through the analysis of internal flow dynamics of flow process, the actual parameters of gas-solid two-phase flow is identified preliminary. According to the simulation results, the parameters of the structure are optimized. And then, the mechanism of snow throwing is further understood. Under the precondition of ensuring the snow throwing head work normally, ensuring thrown snow has relatively standardized shape when it is thrown, reducing power consumption and improving polishing efficiency of snow, flow structure of was optimized.