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RISEffect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper examines the effects of steady-state and transient hydrogen enrichment on thermoacoustic instability in a model gas turbine combustor. Combustion instability, a feedback loop between flame heat release rate ...
The Effect of the Degree of Premixedness on Self-Excited Combustion Instability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The use of lean, premixed fuel and air mixtures is a common strategy to reduce NOx emissions in gas turbine combustors. However, this strategy causes an increased susceptibility to self-excited instability, which manifests ...
Relative Effects of Velocity- and Mixture-Coupling in a Thermoacoustically Unstable, Partially Premixed Flame
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Combustion instability, which is the result of a coupling between combustor acoustic modes and unsteady flame heat release rate, is a severely limiting factor in the operability and performance of modern gas turbine engines. ...
Development of a Method for Shape Optimization for a Gas Turbine Fuel Injector Design Using Metal-Additive Manufacturing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Adjoint shape optimization has enabled physics-based optimal designs for aerodynamic surfaces. Additive manufacturing (AM) makes it possible to manufacture complex shapes. However, there has been a gap between optimal and ...
Impact of Diluents on Flame Stability With Blends of Natural Gas and Hydrogen
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Two potential decarbonization pathways for natural gas (NG)-fueled gas turbine engines include blending hydrogen (H2) into NG and postcombustion carbon capture. H2 blending changes several combustion properties, including ...
Effect of Inert Species on the Static and Dynamic Stability of a Piloted, Swirl-Stabilized Flame
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Carbon sequestration and utilization has been proposed as a method for decarbonizing high-efficiency industrial gas turbines operating on natural gas fuels for power generation and industrial markets. To increase the ...
Effect of Exhaust Gas Recirculation on Combustion Efficiency in a Swirl Stabilized Flame With Blends of Natural Gas and Hydrogen
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Abstract. Reducing the carbon impact of power-generation and industrial gas turbines can be achieved through blending of low-carbon fuels as well as carbon capture. In gas turbines, carbon capture is facilitated by the use ...
Describing the Mechanism of Instability Suppression Using a Central Pilot Flame With Coupled Experiments and Simulations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Pilot flames are commonly used to extend combustor operability limits and suppress combustion oscillations in low-emissions gas turbines. Combustion oscillations, a coupling between heat release rate oscillations and ...
Review of the Impact of Hydrogen-Containing Fuels on Gas Turbine Hot-Section Materials
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In an effort to achieve worldwide decarbonization goals, a range of low-carbon fuels is being proposed for use in power-generation gas turbines. Two promising fuels are hydrogen and ammonia, which do not produce any CO2 ...
Meta-Analysis of Thermal Barrier Coating Lifetimes in High-Water Vapor Environments: Implications for High-Hydrogen Gas Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Abstract. Thermal barrier coatings (TBC) are used to protect hot-section components, including combustor liners, turbine blades and vanes, and shrouds in gas turbine hot sections. Because improvements in combined-cycle gas ...