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Numerical Modeling of Bidirectional Swirling Flow in Vortex Engine

Keshavarz Mohammadain, Poorya | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46148 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan
  7. Abstract:
  8. Detecting of coherent structures in bidirectional vortex combustion chamber is the original aim of this project. For this aim a numerical simulation is performed by using OpenFOAM, open-source CFD software. Also influence of fuel nozzle places in formation of coherent structures is analyzed. Effects of combustion in these structures and differences in cold and hot flows are analyzed too. There are papers that present influence of coherent structures in vortex burners and other applications, but based on reviews that are performed in this work, it seems that influence of coherent structures have not seen in bidirectional vortex chambers. So it can be one of innovations of this work. Swirl number and its variations along the chamber is another point of this work. Results show that the average of swirl number in chambers with shorter length is higher than others. Comparisons between results of cold and hot flow show that flow pattern in these simulations are definitely different. In cold simulation, because of high radial pressure gradient, vortex breakdown phenomenon will occur while in hot simulation, heat release of combustion accelerates axial velocity so it overcomes to radial pressure gradient and vortex breakdown phenomenon do not see in this case. Swirl number in hot flow is about 0.6 while in cold flow is about 1.7 and these are in accordance with flow patterns
  9. Keywords:
  10. Swirling Flow ; Vortex Breakdown ; OpenFOAM Software ; Bidirectional Swirl Flow ; Vortex Engine ; Coherent Structures

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