Experimental and Computational Investigation of Light-Gas Injectors in a Mach 4.0 Crossflow

Maddalena, Luca; Campioli, Theresa L.; Schetz, Joseph A.

doi:10.2514/1.19141

Cited by 58 publications

(43 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most of our knowledge on transverse and inclined sonic jets into supersonic crossflows derives from flow visualizations and measurements in experimental studies [1][2][3][4][5]. The main features of the time-averaged flow field of a transverse under-expanded gaseous jet into a supersonic stream have been sketched by Gruber et al (Figure 1) [2].…”

Section: Introductionmentioning

confidence: 97%

“…In the the present work, the employed LES methodology uses the SGS stretchedvortex model developed by Pullin and co-workers [17][18][19] (Section 2.2), and a controlled dissipation hybrid numerical approach that uses tuned centered finite differences (TCD) in smooth flow regions, and the weighted essentially non-oscillatory (WENO) scheme around discontinuities and ghost-fluid boundaries (Section 2.3). The selected test case matches the experimental conditions of a sonic helium-inclined jet into a supersonic air crossflow at Mach 3.6 that was experimentally investigated by Maddalena et al [5].…”

Section: Introductionmentioning

confidence: 98%

“…The Reynolds number of such flows is sufficiently large so that a Direct Numerical Simulation (DNS) is currently infeasible. The documented numerical studies of jets in supersonic crossflows relied on Reynolds-Averaged NavierStokes (RANS) equations [5,9,10], Detached Eddy Simulation (DES) [9,10], and Large Eddy Simulation (LES) [11][12][13]. The LES of von Lavante et al [11] uses the Smagorinsky subgrid scale (SGS) model, and includes hydrogen-air chemical reactions with an eightreaction and seven-species model [14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LES of an inclined sonic jet into a turbulent crossflow at Mach 3.6

Ferrante

Matheou

Dimotakis

2011

Journal of Turbulence

View full text Add to dashboard Cite

We have performed large-eddy simulation with subgrid scale (LES-SGS) stretchedvortex model of an inclined sonic jet into a supersonic crossflow at Mach 3.6. The main flow features generated by the gas-dynamic interactions of the jet with the supersonic crossflow, such as barrel shock, shear layer, and counter-rotating vortex pair, are numerically captured by the employed LES-SGS. The transition and spatial development of the jet into a supersonic crossflow have been shown to be strongly dependent on the inflow conditions of the crossflow. This result indicates that correct turbulent inflow conditions are necessary to predict the main flow characteristics, dispersion and mixing of a gaseous jet in a supersonic, turbulent crossflow using LES-SGS. This work presents a methodology for the generation of realistic synthetic turbulent inflow conditions for LES of spatially developing, supersonic, turbulent, wall-bounded flows. The methodology is applied to the study of a supersonic turbulent flow over a flat wall interacting with an inclined jet. The effects of inflow conditions on the spatial development of the inclined jet are discussed, and then the results are compared with the available experimental data. Also, the dominant vortical structures generated by the jet/turbulent boundary layer interaction are identified as sheets, tilted tubes and discontinuous rings, and a visualization of their spatiotemporal development is provided. The identified vortical structures are shown to be enveloped by the helium mass-fraction isosurface, thus showing the important role of those structures in the dispersion of a gaseous jet in a supersonic crossflow.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

LES of an inclined sonic jet into a turbulent crossflow at Mach 3.6

Ferrante

Matheou

Dimotakis

2011

Journal of Turbulence

View full text Add to dashboard Cite

show abstract

“…Such transverse injection schemes have undergone diverse modifications to enhance the mixing characteristics. Novel techniques such as shock enhancement [2][3][4][5], two-stream injection [6,7], oscillating shock wave [8], hypermixing nozzles [9], controlled swirling injectors [10,11], and aeroramps [12,13] have been considered with varying success. A rather comprehensive review of various injection schemes has been carried out [14].…”

mentioning

confidence: 99%

Interaction of Vortex with Bow Shock Wave: Computational Model, Experimental Validation, Enhanced Mixing

2018

View full text Add to dashboard Cite

A computational model is developed using a delayed detached-eddy simulation to examine the various aspects of shock-wave/vortex interactions, in which the specific case of naturally formed bow shock wave generated during a sonic injection into a supersonic crossflow is considered. The model is validated by comparing with experimental results obtained previously and is deployed to investigate the effects of shock/vortex interaction on mixing characteristics of supersonic flows. A vortex generator, in the form of a semispan wing section, is placed at an angle of attack upstream of an injection location. The resultant vortex interacts with the bow shock, and for a sufficiently strong interaction, there is breakdown of the supersonic vortex. The vortex bursting observed during the computational study is in a very good agreement with a previous physical model. The computational results demonstrate that the shock/vortex interaction can be an effective method of mixing enhancement because it results in redistribution and increase of vorticity in the flowfield, which enhances the entrainment and eventual mixing of injectant and supersonic crossflow.

show abstract

“…Maddalena [17] simulated an aeroramp injection scheme as well as the transverse injection of sonic helium into a Mach 4 airstream. Again the Wilcox k-ω model was used in conjunction with the GASP solver.…”

mentioning

confidence: 99%