Loading...

Design, Fabrication, and Implementation of an Acoustically Excitable Counterflow Burner

Khademorezaeian, Meysam | 2021

253 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54555 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad
  7. Abstract:
  8. The primary purpose of the present thesis is to provide the feasibility of experimental determination of Counterflow flames dynamic response to acoustic excitations. Following this cause, an excitable counterflow burner test platform was designed, fabricated, implemented, and finally validated. The rich scientific literature associated with counterflow burners, the simple structure of the flame, conceivability of numerical simulation analysis in one, two, or three dimensions, the simplicity of structure among fundamental flames which are correspondingly in resemblance with industrial flames and finally the ability of universalization of scientific result to industrial flames are the reasons behind selecting this kind of burner to study dynamic flame response. The substantial design constraints are the facing nozzles axis alignment with geometrical tolerance of less than 0.05 mm, maintaining the feasibility of studying pre-mixed flames considering safety matters, and the benign flexible transformability if one desires to have an excitable Bunsen burner after removing upper parts of the burner or implementing any arbitrary excitable burner by some primitive part fabrications. After preliminary implementation, one could witness malfunctionalities in burner performance that resulted in the following challenges. First of all, it was necessary to enhance the alignment of the nozzle. Thus, an adjusting mechanism was designed, fabricated, and installed on the bottom head. Secondly, the presence of transverse velocity components inside the curtain flow (co-flow) chamber shall be eliminated; hence, different size gravels were deposited into the chamber to create a semi-porous media. Maintaining the uniformity of exiting flow from this chamber was another issue and obviated by adding four layers of screens at the exit section afterward. The final challenge was condensed vapor on the walls of cooling chamber surrounded by chemical product gasses, which disturbed the flame structure. Avoiding the complexity of adjusting water temperature to prevent over-cooling of chamber walls, air was substituted instead of water. As an enlightening action to provide insight into the physical behavior of stationary counterflow flames, a numerical simulation was also carried out simultaneously. The final experimental and numerical results proved that all constraints were met, and the burner performance was satisfying. As a final action, MATLAB image processing toolbox was used to analyze the camera photos
  9. Keywords:
  10. Acoustics ; Diffusion Flame ; Laminar Diffusion Flame ; Fabrication ; Implementation ; Counterflow Burner ; Flame Response

 Digital Object List

 Bookmark

No TOC