Flame Efficiency, Stabilization and Performance in Prevaporizing/Premixing Combustors.
Final rept. 1 Dec 77-30 Sep 81,
PURDUE UNIV LAFAYETTE IN COMBUSTION LAB
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This program was designed specifically to address problems of combustion efficiency and flame stabilization blowoff and flashback in simplified combustors representative of ramjets dump combustors and advanced turbojets prevaporizingpremixing and catalytic. Numerical, experimental and semi-empirical techniques were used to examine a simplified axisymmetric burner configuration possessing the fundamental characteristics found in real prevaporizingpremixing combustion systems. Numerical analysis of the non-reacting flow field of the prevaporizingpremixing combustor configuration was performed using an elliptic finite-difference computer code utilizing the k - e turbulence model. Calculations were performed for a variety of geometries and inlet flow conditions to the combustor. Gas samples were extracted from within the prevaporizingpremixing combustor for the two flames examined, propane and Jet-A, and analyzed for gaseous components. Temperature and combustion efficiency calculations were made using this information. Examination of the numerical and experimental information revealed the invariant behavior of the fundamental flow field with respect to operating conditions. The type of combustion single or two-phase fuel input into the combustor did not significantly alter the flow field, but it did change the relative intensities of combustion within established combustion zones.
- Combustion and Ignition
- Jet and Gas Turbine Engines