Accession Number : ADP003149

Title :   Development of Temperature-, Velocity- and Concentration-Profiles in a Curved Combustor,


Personal Author(s) : Wittig,S. ; Kutz,R. ; Noll,B. E. ; Platzer,K. H.

Report Date : 1984

Pagination or Media Count : 9

Abstract : The influence of bends, as found in reverse-flow combustors or in various stationary gas turbines, on the flow exiting the mixing zone is studied experimentally. In a first approach, a duct with circular cross section was chosen with a predetermined temperature-, velocity- and concentration-profiles exiting the primary zone of an atmospheric burner. Velocity profiles were measured in three planes (0, 45, and 90 degs) and downstream of the bend using a five-hole spherical probe. The temperature and pressure distribution as well as the concentration profiles, particularly of C02 were measured in the respective planes. It was found, that energy as well as species-transport arises primarily from secondary flow phenomena combined with strong pressure gradients. In a first attempt to clarify the various phenomena, the development of static pressure and temperature is calculated for two-dimensional flow using a finite difference scheme and the well-known k - epsilon turbulence model. It is shown that similar pressure characteristics are obtained. Corresponding temperature profiles, however, result from different sources.

Descriptors :   *Combustors, *Secondary flow, Mixing, Duct bends, Curved profiles, Two dimensional flow, Data acquisition, Static pressure, Velocity, Concentration(Composition), Pressure gradients, Turbulent flow, Temperature, Profiles, Compressible flow, Measurement, Heat transfer, Mass transfer, Finite difference theory, Mathematical models, Gas turbines, West Germany

Distribution Statement : APPROVED FOR PUBLIC RELEASE