Abstract (Summary)
An experimental study has been conducted to study the behavior of liquid jets injected transversely into a subsonic crossflow of air. Liquid jet operating conditions are represented by the aerodynamic Weber number (We) and the liquid-air momentum ratio (q). Three injection liquids, water, Jet-A and N-Heptane, and two injection diameters (D), 0.381 and 0.762 mm, have been used to increase the range of operating conditions for the current experiments. q was restricted to 0.7-10.2 to ensure applicability to premix ducts of LPP combustors. Pulsed shadowgraphy and Phase Doppler Particle Analyzer (PDPA) techniques were used to take measurements for these experiments. Jet breakups and penetrations, and the structures of the sprays produced after breakup have been studied. Two breakup modes have been observed, column and surface breakup. The streamwise location of breakup is constant while the transverse location increases with q. Jet penetrations have been correlated with q, D and the streamwise distance (z). The volume flux of the spray exhibits a maximum in the spray core. Droplet axial velocities (U d ) exhibit a minimum below the spray core and increase with increasing transverse distance. The transverse location of the maximum in the droplet sizes occurs in the spray core for low q. Its location increases with an increase in q. Droplet sizes decrease with an increase in the crossflow velocity (U ? ) while penetration increases with an increase in D or q. This property has been found to be very significant.
Bibliographical Information:


School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:liquid jet crossflow subsonic breakup penetration spray atomization


Date of Publication:01/01/2004

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