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Experimental and Numerical Investigation of Bidirectional Swirl Flow Field in Vortex Engine

Aghakashi, Vahid | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50989 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Mozafari, Ali Asghar
  7. Abstract:
  8. Investigation of flow field and vortex structures in swirl flows and their velocity components, have received widespread interest among the researchers in the field of fluid mechanics. Due to the importance of vortex structures and their applications in combustion chambers, a special type of combustion chamber which is called “bidirectional swirl combustor” has been investigated in this work. Accurate identification of vortex phenomenon and flow structure in vortex engine leads to better design and control of the engine in the field of stability, geometry, cooling and combustion efficiency. Eperimnetal methods in this area are difficult but very valuable and efficient. Numerical methods are also less costly and appropriate tools. In this study, PIV method has been used to extract the velocity field in bidirectional swirl combustion chamber. Numerical solutions have been performed via OpenFOAM open source code. The velocity distribution obtained from the numerical investigation is used to identify coherent and vortex structures using new criteria namely and Q for identification of vertex structure and compare with experimental results. The results of this research lead to find the primary and secondary vortex structures and the location of their formation in the chamber. The extraction of the swirl intensity distribution curve in the swirl chamber and its relation with flow structures are the innovative features of the present work. A hot flow experimental and numerical study has been provided to obtain temperature distribution on the liner of annular combustor. The existence and role of a liner on shaft in the middle of the chamber in the presence of swirl combustion flow is a novel idea. Maximum temperature is seen in the middle of chamber. Swirl intensity in the middle of chamber has minimum value and its incremental behavior along the chamber head ensures that this area is the best location to inject fuel
  9. Keywords:
  10. Swirling Flow ; Vortex Engine ; Coherent Structures ; Particle Image Velocimetery (PIV) ; Swirl Intensity

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