Combustion and heat transfer: Volume 3 -- Combustion studies. Final report, 8 June 1992--31 December 1997
The objective of the proposed research was to develop a fundamental understanding of the combustion process in a gas turbine combustor. Specifically, the authors performed WSR experiments, vortex-flame interaction studies, flame stabilization research, and studies of turbine blade film cooling. A toroidal WSR was used to study lean blowout (LBO), combustion efficiency, and emissions. They found that fuel hydrocarbons of different structure and (C/H) ratio produced a noticeable influence on the combustion and emissions performance of a gas turbine combustor. In the vortex-flame interaction, the extinction caused by internal vortex is primarily due to the unsteady transport effects on chemical kinetics and extinction due to external vortex is caused due to excess convective influx into the strained flame. The authors studied the structure and stability (especially LBO) of a turbulent swirling flame in a variety of model combustors and found that swirl promotes turbulence and creates a positive radial velocity component that increases flame spread and turbulent mixing. The computations predicted the attached flame locations, the development of a strong inner recirculation zone, the flame lift-off height, the location of reattachment point of the recirculation bubble. In the research on turbine blade cooling, PIV measurements showed an almost doubling of the jet spread for an increase in free stream turbulence from 1% to 17%. and forcing of the film cooling flow resulted in a decrease in film cooling effectiveness by as much as 70%.
- Research Organization:
- Dayton Univ., Research Inst., OH (United States)
- OSTI ID:
- 350620
- Report Number(s):
- AD-A--359287/XAB; UDR-TR--1998-00095-VOL-3; CNN: Contract F33615-92-C-2207
- Country of Publication:
- United States
- Language:
- English
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