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Investigation of Interactions of Injectors and Walls in Vortex Engines

Hamzeie, Faraz | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41864 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mozafari, Ali Asghar; Saidi, Mohammad Hassan; Ghafourian, Akbar
  7. Abstract:
  8. A new experimental setup was fabricated; equipped with an adjustable chamber’s length, with air tangentially flowing through the wall of vortex engine. In a vortex combustion chamber, the tangential inlet fuel or oxidizer creates both inner and outer vortices which are rotating in the same angular direction. Indeed, inner vortex moves from head to the end of engine in the axial direction; however, outer vortex moves in the opposite direction. This setup was fabricated to see the effect of fuel nozzle characteristics on the wall temperature of the chamber. In a vortex engine, vortices affect spray droplets and force them to have a spiral path. Moreover, relative velocity of droplets and flow filed in the axial direction act as a counter-direction force against spray axial penetration. Droplet resident time and spray characteristics may be varied by changing swirl number and axial velocity in bidirectional vortex flow field. Droplets motion defines governing equations. These equations in the form of nonlinear, coupled, and second order ODE are solved by a numerical scheme. Numerical results indicate the spots where droplets collide the chamber’s wall. The results can demonstrate the optimum value of spray angle of nozzles and droplets velocity. The present experimental results indicated that in spite of the total rise in the wall temperature of the chamber by introducing more fuel pressure, the spots where the droplets collide the wall of the chamber, will experience less increase in temperature and the film cooling of fuel can be easily recognized in the process
  9. Keywords:
  10. Vortex Combustion Chamber ; Swirling Flow ; Film Cooling ; Two Phase Flow ; Vortex Engine ; Spray Combustion

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