DTIC ADA480828: Numerical Study of Two Phase pdf

DTIC ADA480828: Numerical Study of Two Phase_bookcover

DTIC ADA480828: Numerical Study of Two Phase

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A numerical study was performed to investigate the two-phase flow field in a geometrically simplified swirl cup in a gas turbine combustor. The actual combustor has a hybrid-atomization feature with pressure atomization from the nozzle and airblast reatomization for the liquid film at the tip of venturi wall. The amount of liquid film formed in venturi tube could play an important role in characterizing the flow field of this combustor. Therefore, the major objective is to investigate the effects of swirl mode, gas temperature, and droplet injection characteristics on the amount of liquid film formed on the venturi wall. The present study first investigates the effects of the swirl mode and temperature of the primary and secondary air on the gas-phase flow field and then the effect of droplet injection characteristics in terms of velocity and location on the droplet transport and vaporization behavior. The detailed plots of droplet trajectory are used to identify the size ranges of the droplets which can form a liquid film by their impaction on the venturi tube wall.

In general, the results indicate that the droplet injection characteristics have the dominant effect on the cut-off droplet diameter for droplet impaction on the venturi wall

  • Creator/s: Defense Technical Information Center
  • Date: 9/24/2007
  • Year: 2007
  • Book Topics/Themes: DTIC Archive, Park, Tae W, AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE, *GAS TURBINES, *FLOW FIELDS, *TWO PHASE FLOW, *VAPORIZATION, EDDIES(FLUID MECHANICS), COMBUSTORS, ATOMIZATION, SPRAY NOZZLES, VENTURI TUBES

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