Research Initiation Award: The Effects of Turbulence on the Drag and Evaporation Rate of Liquid Droplets

提出了一种研究液滴与尺寸相当的湍流气体涡间相互作用的实验研究方法。测量湍流气流中的液滴直径、速度和加速度将使用频闪阴影摄影技术。湍流气流将在带有湍流发电栅格的风洞中产生。用激光多普勒测速仪对气体湍流进行了表征。有关质量和动量传递、液滴阻力系数和蒸发速率的数据将在实际喷雾中看到的液滴雷诺数范围内(1到500)获得。这些结果将有助于更好地理解液滴的传输过程，并将其应用于燃烧室中的喷雾建模。

An experimental study to investigate the interaction between droplets and comparable sized turbulent gas vortices is proposed. Measurements of droplet diameters, velocities, and accelerations in a turbulent air stream will be made using strobed shadow photography. The turbulent air flow will be generated in a wind tunnel with turbulence generating grids. Laser Doppler velocimetry will be used to characterize the gas turbulence. Data on the mass and momentum transfer, drop drag coefficients and evaporation rates will be obtained in the range of droplet Reynolds numbers (1 to 500) seen in real sprays. The results will be useful for better understanding droplet transport processes, with application to modeling sprays in combustion chambers.