We employ a large chamber of homogeneous turbulence in a recently introduced facility to experimentally investigate the properties of a liquid water spray produced by a hollow-cone nozzle. We characterize the properties of the spray issued in quiescent and turbulent air, and in particular: the spray penetration, its mixing with the surrounding air, the droplet size distribution, and the related Eulerian and Lagrangian two-point correlations. This is the first study in which spray dynamics are investigated over the full range of relevant scales with and without a turbulent background. To this end we perform planar imaging at various spatial and temporal resolutions. Focusing on a window in the far field, we perform particle tracking velocimetry using a high-speed laser and camera system, and droplet sizing by shadowgraphy using a low-speed high-resolution camera mounted on a long-range microscope and synchronized with a pulsed LED. The resulting spray penetration and flow characteristics for cases with and without background turbulence are discussed.
|Original language||English (US)|
|State||Published - Jan 1 2019|
|Event||11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom|
Duration: Jul 30 2019 → Aug 2 2019
|Conference||11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019|
|Period||7/30/19 → 8/2/19|