Abstract
Investigation of the classical and pulsating jet in crossflow (JICF) at a low Reynolds number (Re = 100) has been performed by the LES method based on varied velocity ratios (r= 1~4). Time-averaged particle trajectories are compared in the classical and pulsating JICF. The formation mechanism and the corresponding flow characteristics for the counter-rotating vortex pair (CRVP) have been analyzed. An unexpected “vortex tail” has been found in the JICF at higher velocity ratio due to the enhanced interactions indicated by the increased jet momentum among the CRVP, upright vortices, and shear layers. The analysis of time-averaged longitudinal vorticity including a coupling mechanism between vortices has been performed. The returning streamlines appear in the pulsating JICF, and two extra converging points emerge near the nozzle of the jet at different Strouhal numbers. The temperature profiles based on the iso-surface for the classical and pulsating JICF have been obtained computationally and analyzed in detail.
Highlights
The jet in crossflow (JICF) is an essential flow phenomenon which is used in many aerospace engineering and environmental applications for efficient dispersion of the species [1, 2]
0.25 with different Strouhal numbers; the results clearly reveal that the performance of higher velocity ratios shows the deeper penetration than the lower ones
The time-averaged particle trajectories of the pulsating JICF can be generated higher than the classical JICF
Summary
The jet in crossflow (JICF) is an essential flow phenomenon which is used in many aerospace engineering and environmental applications for efficient dispersion of the species [1, 2]. The impact of geometry and flow configuration (velocity ratio, turbulence, inclination angle, temperature, etc.) on jet trajectory, scalar mixing, the morphology of structures, and other flow phenomena on the JICF have been investigated in previous research [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28]. Hsu and Huang [4] had conducted experiments to study the effects of acoustic excitation on the flow behavior, penetration, and the spread of stack-issued, wall-issued transverse jets. The formation of vortex rings in negatively buoyant starting jets had been studied numerically by Marugan-Cruz et al [5] based on different
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
