Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1321-1340 of 9564
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Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics
(The American Society of Mechanical Engineers (ASME), 2021)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 ... -
A Theoretical Investigation on the Performance and Combustion Parameters in an Spark Ignition Engine Fueled With Different Shale Gas Mixtures
(The American Society of Mechanical Engineers (ASME), 2021)In this paper, a zero-dimensional (0D) single-zone combustion model was applied for predicting combustion and indicated engine parameters in a spark ignition (SI) engine. Three different shale gas mixtures, methane, and ... -
Boundary Layer Flashback Model for Hydrogen Flames in Confined Geometries Including the Effect of Adverse Pressure Gradient
(The American Society of Mechanical Engineers (ASME), 2021)The combustion properties of hydrogen make premixed hydrogen-air flames very prone to boundary layer flashback. This paper describes the improvement and extension of a boundary layer flashback model from Hoferichter et al. ... -
Rotordynamic Behavior of Leaf Seals: Measurement of Frequency-Dependent Force Coefficients for Varying Inlet Parameters
(The American Society of Mechanical Engineers (ASME), 2021)While brush seals can be found in various applications for turbomachines today, leaf seals are a further development in compliant seal technology and have a lower level of maturity. Among the purported advantages are greater ... -
Design and Testing of a Rig to Investigate Buoyancy-Induced Heat Transfer in Aero-Engine Compressor Rotors
(The American Society of Mechanical Engineers (ASME), 2021)The change in compressor blade-tip clearance across the flight cycle depends on the expansion of the rotor, which in turn depends on the temperature and stress in the disks. The radial distribution of temperature is directly ... -
Challenges in Validating a Thermo-Hydrodynamic Gas Foil Bearing Model
(The American Society of Mechanical Engineers (ASME), 2021)Gas foil bearings (GFBs) are suitable for high speed and temperature applications where conventional lubricated bearing solution are not feasible. This requires the prediction of bearing temperatures and thus a thermal ... -
Experimental Investigation of a Radial Wave Engine Utilizing a Rotary Valved Pressure Gain Combustor
(The American Society of Mechanical Engineers (ASME), 2021)In this paper, a deflagrative pressure gain combustor employing rotary valves is introduced that can reduce combustor length by allowing the combustion process to take place in the radial direction rather than in the axial ... -
Acoustic Energy Balance During the Onset, Growth, and Saturation of Thermoacoustic Instabilities
(The American Society of Mechanical Engineers (ASME), 2021)Thermoacoustic instabilities can occur in a wide range of combustors and are prejudicial since they can lead to increased mechanical fatigue or even catastrophic failure. A well-established formalism to predict the onset, ... -
Preliminary Design Framework for the Power Gearbox in a Contra-Rotating Open Rotor
(The American Society of Mechanical Engineers (ASME), 2021)Geared contra-rotating open rotors have the potential to further reduce fuel consumption relative to geared turbofans, but require a more-complex speed-reducing transmission system to drive the propellers. Hitherto, the ... -
Experimental Investigation of the Impact of Biogas on a 3 kW Micro Gas Turbine FLOX®-Based Combustor
(The American Society of Mechanical Engineers (ASME), 2021)The use of biogas has currently two disadvantages. First, processing biogas to natural gas quality for feeding into the natural gas grid is a rather energy-consuming process. Second, the conversion into electricity directly ... -
A Joint Experimental and Large Eddy Simulation Characterization of the Liquid Fuel Spray in a Swirl Injector
(The American Society of Mechanical Engineers (ASME), 2021)The quality of liquid fuel spray injection determines to a large extent the performance of aero-engine combustors. This investigation focuses on the detailed characterization of the liquid fuel spray in a test rig targeted ... -
Model-Based Analysis of a Combined Heat and Power System Featuring a Hydrogen-Fired Gas Turbine With On-Site Hydrogen Production and Storage
(The American Society of Mechanical Engineers (ASME), 2021)Hydrogen-fired gas turbines can play an important role in carbon-neutral energy and industry sectors. However, the required demand-oriented supply of CO2-neutral hydrogen is technically and economically challenging. These ... -
Investigation of Unsteady Pressure Fluctuations in a Simplified Steam Turbine Control Valve
(The American Society of Mechanical Engineers (ASME), 2021)Steam turbines are among the most important systems in commercial and industrial power conversion. As the amount of renewable energies increases, power plants formerly operated at steady-state base load are now experiencing ... -
Model-Based Thermodynamic Analysis of a Hydrogen-Fired Gas Turbine With External Exhaust Gas Recirculation
(The American Society of Mechanical Engineers (ASME), 2021)Climate science shows that the limitation of global warming requires a rapid transition toward net-zero emissions of green house gases on a global scale. Expanding renewable power generation in a significant way is seen ... -
A Quasi-Dimensional Fuel Distribution Model for a Radially Stratified Engine
(The American Society of Mechanical Engineers (ASME), 2021)Several combustion strategies leverage radial fuel stratification to adapt cylinder composition between the center of the chamber and the outer regions independently. Spark-assisted compression ignition (SACI) relies on ... -
Comparison of Piston Concept Design Solutions for Composite Cycle Engines Part II: Design Considerations
(The American Society of Mechanical Engineers (ASME), 2021)Hecto pressure composite cycle engines with piston engines and piston compressors are potential alternatives to advanced gas turbine engines. The nondimensional groups limiting their design have been introduced and generally ... -
Identification of Dynamic Coefficients of a Five-Pad Tilting Pad Journal Bearing Up to Highest Surface Speeds
(The American Society of Mechanical Engineers (ASME), 2021)Tilting-pad journal bearings are widely used in turbomachinery industry due to their positive dynamic properties at high rotor speeds. However, the exact description of this dynamic behavior is still part of current research. ... -
Conjugate Heat Transfer Simulation and Entropy Generation Analysis of Gas Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2021)Reynolds-averaged Navier–Stokes (RANS) model-based conjugate heat transfer (CHT) method is so far popularly used in simulations and designs of internally cooled gas turbine blades. One of the important factors influencing ... -
Boundary Layer Flashback Limits of Hydrogen-Methane-Air Flames in a Generic Swirl Burner at Gas Turbine-Relevant Conditions
(The American Society of Mechanical Engineers (ASME), 2021)Operating stationary gas turbines on hydrogen-rich fuels offers a pathway to significantly reduce greenhouse gas emissions in the power generation sector. A key challenge in the design of lean-premixed burners, which are ... -
Experimental Analysis of Blade-Casing Contacts in a Centrifugal Compressor: Vibration and Thermal Aspects
(The American Society of Mechanical Engineers (ASME), 2021)Due to an increasing need for efficiency of turbo-engines, rotor–stator clearances are being lowered. Therefore, new designs show higher probability for contacts between rotors and casings. When contacts occur, high dynamic ...