Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1841-1860 of 9564
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Assessment of CO2 and NOx Emissions in Intercooled Pulsed Detonation Turbofan Engines
(The American Society of Mechanical Engineers (ASME), 2019)In the present paper, the synergistic combination of intercooling with pulsed detonation combustion is analyzed concerning its contribution to NOx and CO2 emissions. CO2 is directly proportional to fuel burn and can, ... -
Effects of Inlet Disturbances on Fan Stability
(The American Society of Mechanical Engineers (ASME), 2019)This paper investigates the effects of inlet disturbance caused by crosswind on a fan blade operation and addresses the possible aerodynamic instabilities, which can arise for such a fan-intake system. The work is carried ... -
An Influence of a Fluidic Oscillator Insertion in a Swirl-Stabilized Burner on Turbulent Premixed Flame
(The American Society of Mechanical Engineers (ASME), 2019)A series of experiments were performed on a vertical EV burner with a constant coflow air of 873 L/min to generate turbulent lean premixed flow in order to study the impact of the addition of acetylene/argon mixture to the ... -
An Efficient Iterative Coupled Model for the Study of the Insurgence of the Morton Effect in Tilting Pad Journal Bearings
(The American Society of Mechanical Engineers (ASME), 2019)The introduction of the tilting pad journal bearing (TPJB) technology has allowed the achievement of important goals regarding turbomachinery efficiency in terms of high peripheral speed, enhanced power density, higher ... -
Performance Enhancement of a Molten Carbonate Fuel Cell/Micro Gas Turbine Hybrid System With Carbon Capture by Off-Gas Recirculation
(The American Society of Mechanical Engineers (ASME), 2019)The demand for clean energy continues to increase as the human society becomes more aware of environmental challenges such as global warming. Various power systems based on high-temperature fuel cells have been proposed, ... -
Stability and Limit Cycles of a Nonlinear Damper Acting on a Linearly Unstable Thermoacoustic Mode
(The American Society of Mechanical Engineers (ASME), 2019)The resonant coupling between flames and acoustics is a growing issue for gas turbine manufacturers, which can be reduced by adding acoustic dampers on the combustion chamber walls. Nonetheless, if the engine is operated ... -
Impact of Predicted Combustor Outlet Conditions on the Aerothermal Performance of Film-Cooled High Pressure Turbine Vanes
(The American Society of Mechanical Engineers (ASME), 2019)Turbine inlet conditions in lean-burn aeroengine combustors are highly swirled and present nonuniform temperature distributions. Uncertainty and lack of confidence associated with combustor-turbine interaction affect ... -
Theoretical and Experimental Analyses of Directly Lubricated Tilting-Pad Journal Bearings With Leading Edge Groove
(The American Society of Mechanical Engineers (ASME), 2019)Flooded lubrication of tilting-pad journal bearings provides safe and robust operation for many applications due to a completely filled gap at the leading edge of each pad. Direct lubrication by leading edge grooves (LEG) ... -
Flow-Induced Steam Valve Vibrations—A Literature Review of Excitation Mechanisms, Preventive Measures, and Design Improvements
(The American Society of Mechanical Engineers (ASME), 2019)Steam turbine inlet valves are used to control the power output of steam turbines for power generation. These valves may be subject to vibration under certain operating conditions, especially in part-load operation. Several ... -
Proper Orthogonal Decomposition and Extended- Proper Orthogonal Decomposition Analysis of Pressure Fluctuations and Vortex Structures Inside a Steam Turbine Control Valve
(The American Society of Mechanical Engineers (ASME), 2019)In steam turbine control valves, pressure fluctuations coupled with vortex structures in highly unsteady three-dimensional flows are essential contributors to the aerodynamic forces on the valve components, and are major ... -
The Influence of Thermal Transient Rates on Coated Turbine Parts' Life Expectancy
(The American Society of Mechanical Engineers (ASME), 2019)During rapid engine throttling operations, turbine airfoils can experience very rapid heating and cooling, particularly at take-off conditions. These rapid transient events lead to the generation of high thermal gradients ... -
Modeling and Analysis of Tier 4 Locomotives Operating in a High-Altitude Tunnel
(The American Society of Mechanical Engineers (ASME), 2019)Tunnels represent one of the most severe operating conditions for diesel engines in diesel-electric locomotive applications, specifically for nonventilated tunnels located at high elevation. High ambient air temperatures ... -
Reduced-Order Modeling of Bladed Disks Considering Small Mistuning of the Disk Sectors
(The American Society of Mechanical Engineers (ASME), 2019)A model order reduction method based on the component mode synthesis for mistuned bladed disks is introduced, with one component for the disk and one component for each blade. The interface between the components at the ... -
Performance Testing of an Axial Flow Fan Designed for Air-Cooled Heat Exchanger Applications
(The American Society of Mechanical Engineers (ASME), 2019)An axial flow fan developed in the previous study is tested in order to characterize its performance. The M-fan, a 7.3152 m diameter rotor only axial flow fan was designed to perform well under the challenging operating ... -
An Extension of the Classical Subset of Nominal Modes Method for the Model Order Reduction of Gyroscopic Systems
(The American Society of Mechanical Engineers (ASME), 2019)In the structural dynamics design process of turbomachines, Coriolis effects are usually neglected. This assumption holds true if no pronounced interaction between the shaft and disk occurs or if the radial blade displacements ... -
Nonlinear Vibration of Rotating Corotational Two-Dimensional Beams With Large Displacement
(The American Society of Mechanical Engineers (ASME), 2019)In this paper, the nonlinear vibrations of rotating beams with large displacements are investigated by the use of the co-rotational (C-R) finite element method. In the C-R approach, the full motion is decomposed into a ... -
Optical Measurements of a Lower Calorific Values-Combustor Operated in a Micro Gas Turbine With Various Fuel Compositions
(The American Society of Mechanical Engineers (ASME), 2019)In a recent joint research project, a new FLOX®-combustion system was developed to couple a fixed-bed gasifier with a micro gas turbine (MGT). Product gases from biomass gasification exhibit low calorific values and varying ... -
Mechanical Properties and Structure of Laser Beam and Wide Gap Brazed Joints Produced Using Mar M247–Amdry DF3 Powders
(The American Society of Mechanical Engineers (ASME), 2019)The microstructure and mechanical properties of materials produced by wide gap brazing (WGB) and laser beam (LBW) cladding with different blends of Mar M247 and Amdry DF-3 brazing powders were studied. It was shown that ... -
Effects of Asymmetry on Thermoacoustic Modes in Annular Combustors: A Higher-Order Perturbation Study
(The American Society of Mechanical Engineers (ASME), 2019)Gas-turbine combustion chambers typically consist of nominally identical sectors arranged in a rotationally symmetric pattern. However, in practice, the geometry is not perfectly symmetric. This may be due to design ... -
Measurement and Evaluation of Shaft Torsional Vibrations Using Shaft Instantaneous Angular Velocity
(The American Society of Mechanical Engineers (ASME), 2019)Online evaluation of possible failures of a turbine is a key factor for a successful long-term turbine operation. Fluctuations of generator air-gap torque, caused for example by nonstationary conditions of electrical power ...