Numerical simulations are used to study an under-expanded sonic jet injected into a supersonic crossflow and an over-expanded supersonic jet injected into a subsonic crossflow, where the flow conditions are based on Santiago et al.’s (1997) and Beresh et al.’s (2005) experiments, respectively. A finite volume compressible Navier–Stokes solver developed by Park & Mahesh (2007) for unstructured g...

This paper presents numerical simulation results of the primary atomization of a turbulent liquid jet injected into a gaseous crossflow. Simulations are performed using the balanced force refined level set grid method. The phase interface during the initial breakup phase is tracked by a level set method on a separate refined grid. A balanced force finite volume algorithm together with an interf...

The problem of breakup of a liquid fuel in a crossflow finds relevance in applications such as lean premixed prevaporized (LPP) ducts, afterburners for gas turbines and combustors for ramjets and scramjets. Combustion efficiency and pollutant formation are directly determined by the efficient mixing of the fuel/air mixture, which is in turn controlled by the breakup of the fuel jet. Liquid jet ...

The purpose of the present study is to clarify the heat transfer characteristics with multiple jet impingement aiming at the highly efficient cooling performance. In the study, we investigated the effect of injection parameters on circular jet array impingement heat transfer. As we focus on interference among the adjacent impinging jets, tests are mainly conducted at the minimum crossflow condi...

Experimental results on the characteristics of near-field (up to x/D=8) spray formed by a liquid jet injected into an oscillating air crossflow are presented. The modulation frequency is varied from 90 Hz to 450 Hz and the crossflow velocity (25-100 m/sec) and ambient pressure (2-3 atm) are systematically changed to investigate the spray response to modulated crossflow velocity over a range of ...

This experimental study focused on the controlled acoustical excitation of a round gas jet injected transversely into crossflow. Use of an open loop, “feed forward” controller or compensator in the experiments 1 allowed for straightforward comparisons to be made among jet responses to different conditions of acoustic excitation of jet fluid. It was found that, for a variety of excitation freque...

Anexperimental investigation of the deformation andbreakupproperties of turbulent round liquid jets in uniform gaseous crossflows is described. Pulsed shadowgraphandholographobservationswere obtained for turbulent round liquid jets injected normal to air crossflow in a shock tube. Crossflow velocities of the air behind the shock wave relative to the liquid jet were subsonic (36–90 m=s) and the ...

Direct numerical simulation is used to study a round turbulent jet in a laminar crossflow. The ratio of bulk jet velocity to free-stream crossflow velocity is 5.7 and the Reynolds number based on the bulk jet velocity and the jet exit diameter is 5000. The mean velocity and turbulent intensities from the simulations are compared to data from the experiments by Su & Mungal (2004) and good agreem...