Accession Number : ADA134113

Title :   Flame Efficiency, Stabilization and Performance in Prevaporizing/Premixing Combustors.

Descriptive Note : Final rept. 1 Dec 77-30 Sep 81,


Personal Author(s) : Mellor,A M ; Proctor,C L ; Nein,A G

PDF Url : ADA134113

Report Date : Oct 1981

Pagination or Media Count : 12

Abstract : 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 (prevaporizing/premixing and catalytic). Numerical, experimental and semi-empirical techniques were used to examine a simplified axisymmetric burner configuration possessing the fundamental characteristics found in real prevaporizing/premixing combustion systems. Numerical analysis of the non-reacting flow field of the prevaporizing/premixing 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 prevaporizing/premixing 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.

Descriptors :   *Combustors, *Flames, *Combustion, Flow fields, Mathematical models, Vaporization, Mixing, Stabilization, Blowoff, Propane, Jet engine fuels, Turbojet engines, Ramjet engines, Combustion stability, Flow separation, Burners, Axisymmetric, Turbulence, Finite difference theory, Machine coding, Efficiency

Subject Categories : Combustion and Ignition
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE