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Experimental Study of Flame Stability on a Reheat System

Nozari, Hadi | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43185 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad
  7. Abstract:
  8. In conventional afterburning systems, the burnt products of the primary combustion enter the afterburning zone, where the fuel is injected and the mixture is ignited to form a flame which is stabilized by a flameholder.
    The present experimental study focuses on concepts of afterburning and flame stability in a reheat system. For this purpose an afterburner setup is designed and manufactured. The setup comprises of two main regions; the preheating region and the reheat zone. Fuel used in preheater is LPG while jet fuel is injected in reheat zone. Through the tests the key parameters which are adjusted to be in similar ranges as the conventional afterburners are the oxygen amount of the gases entering the reheat zone and the fuel to air ration of the afterburning zone. The usual ranges of these two parameters are 12-17 percent of gases volume and 0.03-0.08 respectively. The shape of flameholder is designed to be alike to the RD-33 engine with the same blockage factor but in smaller scale to fit in the afterburner chamber. In fact, by creating a turbulent flow in afterburning zone and by using a real shape of flameholder, the purpose is to study the mechanism of flame stability and its sensitivity to the different parameters of the afterburner inlet flow. Consequently, regarding the results, the flame stability curves are sketched on bases of Reynolds Number and Equivalence Ratio of afterburning zone. As a result, the sensitivity of flame stability ranges related to changes in the amount of the upstream flow oxygen as well as the equivalence ratio of the flame is analyzed using the stability curves
  9. Keywords:
  10. Reheating ; Stability Range ; Primary Combustion ; Secondary Combustion ; Flame Stabilization

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