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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 ...
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 ...
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 ...
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 ...
The Effect of Fuel Staging on the Structure and Instability Characteristics of Swirl-Stabilized Flames in a Lean Premixed Multinozzle Can Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Fuel staging is a commonly used strategy in the operation of gas turbine engines. In multinozzle combustor configurations, this is achieved by varying fuel flow rate to different nozzles. The effect of fuel staging on flame ...
Impact of Precessing Vortex Core Dynamics on Shear Layer Response in a Swirling Jet
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Combustion instability, the coupling between flame heat release rate oscillations and combustor acoustics, is a significant issue in the operation of gas turbine combustors. This coupling is often driven by oscillations ...