A comparison of a single- and multiphase jets in a crossflow using LES
Författare
Summary, in English
Large eddy simulations are performed for a 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 counter-rotating 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 reveals also the intermittent formation of upright wake vortices from the horseshoe vortices on the ground towards 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. 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
Avdelning/ar
Publiceringsår
2005
Språk
Engelska
Sidor
77-86
Publikation/Tidskrift/Serie
Proceedings of the ASME Turbo Expo
Volym
2
Dokumenttyp
Konferensbidrag
Förlag
American Society Of Mechanical Engineers (ASME)
Ämne
- Fluid Mechanics and Acoustics
Nyckelord
- Mass fractions
- Flow solvers
- Mass flow ratios
- Taylor analogy
Conference name
ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
Conference date
2005-06-06 - 2005-06-09
Conference place
Reno-Tahoe, NV, United States
Status
Published