Combustion and Heat Transfer Studies Utilizing Advanced Diagnostics: Combustion Studies.

摘要

A long-term goal of the Air Force is to develop near-stoichiometric gas turbine combustors that will burn broad-specification fuels, and have low maintenance and high durability. Towards meeting this goal, this program had two principal objectives: to design and conduct experiments that will establish a fundamental understanding of lean blowout (LBO), swirling flames, kinetically controlled combustion, and turbine blade cooling, and to provide data sets for evaluating and refining computer models of gas turbine combustor. We successfully designed and operated several laboratory combustors. Two novel methods for CARS slit function were developed; these made possible precise and unambiguous measurements of flame temperature. We identified the complex sequence of events leading to LBO and obtained and analyzed LBO data for different combustor loadings. We investigated the effects of geometric, chemical, and turbulent flow parameters on the structure of the recirculation zone and the flame inside the combustor. Our heat transfer experiments showed that freestream turbulence augments flat plate heat transfer 2 to 2.5 times. Finally, benchmark-quality data for evaluating and refining computer models of gas turbine combustor were made available to industry. In this manner, the program objectives were met.... Lean blowout, Flame stabilization, Combustor design, Swirling flames, Turbulent combustion, Turbine blade cooling.