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Numerical Investigation of Bidirectional Swirl Flow’s Structure in Vortex Engine

Mehrdad, Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46165 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hasan
  7. Abstract:
  8. Numerical investigation of flow field and determination of velocity components in swirl flow are novel and important subjects in combustion chamber of swirl flow. The exact understanding of vortex phenomena and flow structures in vortex engine results in better design and control in terms of stability, geometry, cooling, and combustion efficiency. Although, numerical approaches are computationally complex, they are worthwhile and efficient. The aim of this work is to study the velocity field in a bidirectional swirl flow within the combustion chamber using numerical approaches. The investigation of flow field has been performed in the cold chamber. Four different models (RSM and LES) have been explained and applied to solve the problem. Remarkably, the results demonstrate that the LES model predicts the solution of flow field with the best accuracy. In addition, new methods of diagnosing vortex structure including (region of complex eigenvalue of), (the largest negative eigenvalue of), and (a region of flow, namely second invariant of the velocity gradient tensor) are compared. The method is chosen among them as a criterion to diagnose the flow structure. The coherent structures and vortices in the combustion chamber are identifiedusing the velocity distribution field obtained by the numerical investigation. The importance of identifying vortex structures is in reducing the length of the combustion chamber and determining the temperature of its wall
  9. Keywords:
  10. Swirling Flow ; Numerical Solution ; OpenFOAM Software ; Vortex Engine ; Large Eddy Simulation (LES) ; Cold Chamber

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