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Effect of Air by Oxygen Enrichmenton Burning Rate of Polyethylen in Vortex Ramjet

Darijani, Fatemeh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40498 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghafoorian, Akbar; Ghorbanian, Kaveh; Saeedi, Mohammad Hassan; Mozaffari, Ali Asghar
  7. Abstract:
  8. Bidirectional axial vortex flow and air enriched with oxygen are used in order to increase solid fuel burning rate in both subsonic and supersonic ramjet engines experimentally. Vortex flow enhances combustion by causing erosive burning on the surface of the solid fuel. Air enriched by oxygen increases the combustion temperature. Therefore, they make the usage of subsonic ramjet engines possible for applications in which a low thrust is need for a long duration. An experimental ramjet engine with the capability of simulating subsonic and supersonic flight conditions was designed and fabricated. Polyethylene and oxygen enriched air are used as solid fuel and oxidizer respectively. Oxidizer is injected tangentially from the end side of the engine to generate the bidirectional axial vortex flow along the combustion chamber axis. A simple cylindrical geometry was used for the grain. Oxidizer mass flow rate and chamber pressure were used as control parameters and solid fuel burning rate was measured for each test condition. In subsonic test conditions, polyethylene burning rates for 27.6 to 35.1 % air enriched by oxygen were measured. Mass flow rates of oxidizer were varied from 4.1 to 10.6 gr/s. The results indicate that increasing the percentage of oxygen increases the burning rate from 0.1 to 0.45 gr/s. Burning velocity of polyethylene at supersonic condition of engine operation was measured to be 0.16 mm/sec. Results of this project is useful for designing vortex ramjet engines. Thrust measurements for the supersonic operation range show that 1 percent increasing of oxygen in the oxidizer causes 16.7 percent increase in thrust
  9. Keywords:
  10. Burning Rate ; Solid Fuels ; Solid Fuel Ramjet ; Vortex Engine ; Bidirectional Swirl Flow

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