年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
STRUCTURE OF VAPORIZING PRESSURE ATOMIZED SPRAYS
要約
A detailed characterization of a vaporizing spray produced by a pressure atomizer is presented. The study is part of an ongoing effort to understand the behavior of sprays under a variety of conditions. The atomizer utilized is a standardized research atomizer that can be operated (without modifying the geometry of the atomizer) as either a simplex atomizer or an air-assist atomizer, with both swirling and nonswirling atomizing air, and with or without reaction. Phase Doppler interferometry, laser diffraction, and infrared extinction/ scatter are utilized in the characterization. The measurements include: (1) drop size, velocity, cross-correlations, volume flux, and concentration; (2) gas-phase velocities with and without the spray; and (3) the vapor concentration within the spray. The present data are acquired in the absence of reaction, and include temporally resolved measurements of the droplets. In the present spray, strong dependency of velocity on drop size is observed. Entrainment of surrounding air and gravitational forces lead to segregation of drops based on inertia. The result is that the modulation of the gas-phase velocities (both mean and rms) is correlated in a nontrivial way to the concentration, size, and slip velocity of the drops. The vapor concentration is saturated along the centerline of the spray, and decays in the radial direction due to the entrainment of air. The vapor concentration diffuses similarly to the gas-phase momentum. Finally, comparison of different techniques for measurement of drop size is reasonable, as is comparison of different techniques for measurement of the spray vaporization. The data presented provide a detailed set of measurements for vaporizing, pressure atomized sprays suitable for modeling challenges.
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