0
TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

A Comparison of Single and Multiphase Jets in a Crossflow Using Large Eddy Simulations

[+] Author and Article Information
Mirko Salewski1

Division of Fluid Mechanics, Department of Heat and Power Engineering,  Lund Institute of Technology, P.O. Box 118, 22100 Lund, Swedenmirko.salewski@vok.lth.se

Dragan Stankovic, Laszlo Fuchs

Division of Fluid Mechanics, Department of Heat and Power Engineering,  Lund Institute of Technology, P.O. Box 118, 22100 Lund, Sweden

1

To whom all correspondence should be addressed.

J. Eng. Gas Turbines Power 129(1), 61-68 (Sep 28, 2005) (8 pages) doi:10.1115/1.2180810 History: Received August 25, 2005; Revised September 28, 2005

Large eddy simulations (LES) are performed for single and multiphase jets in crossflow (JICF). The multiphase JICF are compared to the single-phase case for the same momentum and mass flow ratios but with droplets of different sizes. Multiphase JICF have stronger counterrotating vortex pairs (CVPs) than a corresponding single-phase JICF. Moreover, their trajectories are higher and their induced wakes weaker. The smaller the Stokes number of the droplets, the more the solution approaches the solution for single-phase flow. The computed results show the formation of a CVP and horseshoe vortices, which are convected downstream. LES also reveals the intermittent formation of upright wake vortices from the horseshoe vortices on the ground toward the CVP. The dispersion of polydisperse spray droplets is computed using the stochastic parcel method. Atomization and droplet breakup are modeled by a combination of the breakup model by Reitz and the Taylor analogy breakup model (see Caraeni, D., Bergström, C., and Fuchs, L., 2000, Flow, Turbul. Combust., 65(2), pp. 223–244). Evaporation and droplet collision are also modeled. The flow solver uses two-way coupling. Averages of the velocity and gaseous fuel mass fraction are computed. The single-phase JICF is validated against experimental data obtained by PIV. Additionally, the PDFs and frequency spectra are presented.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 10

Grid accuracy for the multiphase flow case

Grahic Jump Location
Figure 11

Spectrum of the vertical velocity

Grahic Jump Location
Figure 1

λ2 vortex visualization (3) of the CVP, the horseshoe vortices, and two upright tornadolike wake vortices, diagonal view

Grahic Jump Location
Figure 2

λ2 vortex visualization (3) of the CVP and two tornadolike wake vortices, side view

Grahic Jump Location
Figure 3

λ2 vortex visualization (3) of the CVP, front view

Grahic Jump Location
Figure 4

Geometry (not to scale) with lines along which data is extracted: 6D∼0.03m, 10D∼0.05m

Grahic Jump Location
Figure 5

Mean vertical velocity profile along prolongation of the nozzle axis

Grahic Jump Location
Figure 6

Mean streamwise velocity profile along prolongation of the nozzle axis

Grahic Jump Location
Figure 7

Mean vertical velocity profile at z=6D

Grahic Jump Location
Figure 8

Mean streamwise velocity profile at z=6D

Grahic Jump Location
Figure 9

Grid accuracy for the single-phase flow case

Grahic Jump Location
Figure 12

Spectrum of the streamwise velocity

Grahic Jump Location
Figure 13

Spectrum of the mixture fraction

Grahic Jump Location
Figure 14

PDF of the vertical velocity

Grahic Jump Location
Figure 15

PDF of the streamwise velocity

Grahic Jump Location
Figure 16

PDF of the mixture fraction

Grahic Jump Location
Figure 17

Downstream-field comparison of vertical velocity profiles between single-phase and multiphase flow with various Stokes numbers

Grahic Jump Location
Figure 18

Downstream-field comparison of streamwise velocity profiles between single-phase and multiphase flow with various Stokes numbers

Grahic Jump Location
Figure 19

Comparison of CVP trajectories for single-phase and multiphase flow with various Stokes numbers

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In