Development of high-efficiency, ultra-clean turbine systems requires significant advances in high temperature materials science, understanding of combustion phenomena, and innovative cooling techniques to maintain integrity of turbine components.

Selected projects will direct efforts toward combustion, aerodynamics, heat transfer, and materials research for syngas- and hydrogen-fueled turbines. The projects include:

• Pennsylvania State University. For this study, the researchers will combine experiments with chemical kinetic modeling to investigate the effects of diluents (water and CO₂) and minor contaminant species (methane, ethane and oxides of nitrogen) on the ignition and combustion of high hydrogen content (HHC) fuels. The proposed work will broaden the experimental database for ignition delay, burning rate and oxidation kinetics at high pressures. The goal is to further advance the development of practical guidelines for realistic composition limits and operating characteristics for HHC fuels. (DOE share, $719,999; recipient share, $180,253; duration: 36 months)

• Texas A&M University. The objective of the proposed research is to provide the gas turbine engine designer with quantitative information pertaining to the physics of secondary flow (an undesirable condition in turbines), its influence on the efficiency and performance of gas turbines, and the impact of film cooling ejection arrangements on reducing or suppressing the detrimental effect of secondary flows. The researchers will pay particular attention to the design of endwall contour geometries with the objective of quantifying the effect of a contoured rotating endwall on secondary flow formation with and without fillets compared with the non-contoured rotating endwall. (DOE share: $399,891; recipient share: $100,078; duration: 36 months)

• University of Texas-El Paso. Thermal barrier coatings (TBCs) protect engine components and allow further increase in engine temperatures for higher efficiency, making them critical technologies for advanced coal-based power generation systems. The researchers propose to develop nanostructured hafnium oxide-based coatings for TBCs of advanced hydrogen turbines. They intend to create a fundamental understanding and knowledge database of next generation TBC materials with high-temperature tolerance, durability and reliability. The proposed nanostructured TBCs will have superior heat resistance, thermal insulation, oxygen barrier qualities, hot-corrosion and erosion resistance, and resistance to adverse coating/substrate interactions. (DOE share: $381,233; recipient share: $95,979; duration: 36 months)