Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1981-2000 of 9564
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Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows
(The American Society of Mechanical Engineers (ASME), 2019)Many laboratory-scale combustors are equipped with viewing windows to allow for characterization of the reactive flow. Additionally, pressure housing is used in this configuration to study confined pressurized flames. Since ... -
Synchronization of Thermoacoustic Modes in Sequential Combustors
(The American Society of Mechanical Engineers (ASME), 2019)Sequential combustion constitutes a major technological step-change for gas turbines applications. This design provides higher operational flexibility, lower emissions, and higher efficiency compared to today's conventional ... -
Thermal Boundary Layer Response to Periodic Fluctuations for Turbulent Flow
(The American Society of Mechanical Engineers (ASME), 2019)The detailed characterization of the thermal boundary layer under periodic fluctuations is vital to improve the performance of cooled turbine airfoils, as well as to assess noise thermal and structural fatigue. In the ... -
Development of a Noncontacting Mechanical Seal for High Performance Turbocharger Applications
(The American Society of Mechanical Engineers (ASME), 2019)This paper presents the design and development of a noncontacting dry-gas mechanical seal for high performance automotive turbocharger applications. Turbochargers are increasingly being incorporated into high performance ... -
A New Approach for Scaling Aspirating Face Seal Aerodynamics
(The American Society of Mechanical Engineers (ASME), 2019)In the present paper, an approach for scaling the aerodynamics of advanced seals is presented. Modern advanced seals, such as a self-adaptive gas lubricated face seal, comprise elements that are commonly used in turbomachinery ... -
Development of a New Low-Cost Tandem Variable Geometry Turbocharging Concept for Turbocharger Applications
(The American Society of Mechanical Engineers (ASME), 2019)The air handling system for large diesel/gas engines such as those used on locomotive, marine, and power generation applications require turbochargers with a high reliability and with turbomachinery capable to adjust to ... -
Importance of Surface Curvature in Modeling Droplet Impingement on Fan Blades
(The American Society of Mechanical Engineers (ASME), 2019)When modeling a droplet impingement, it is reasonable to assume a surface is flat when the radius of curvature of the surface is significantly larger than the droplet radius. In other contexts where water droplet erosion ... -
The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime
(The American Society of Mechanical Engineers (ASME), 2019)Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen ... -
High Frequency Measurement of Temperature and Composition Spots With LITGS
(The American Society of Mechanical Engineers (ASME), 2019)Temperature and composition spots in a turbulent flow are detected and time-resolved using laser-induced thermal grating spectroscopy (LITGS). A 355 nm wavelength particle image velocimetry laser is operated at 0.5–1 kHz ... -
Start-Up Optimization of Combined Cycle Power Plants: A Field Test in a Commercial Power Plant
(The American Society of Mechanical Engineers (ASME), 2019)Requirements for the start-up operations of gas turbine combined cycle (GTCC) power plants have become more diverse and now include such items as reduced start-up time, life consumption, and fuel gas consumption. In this ... -
SI/HCCI Mode Switching Optimization in a Gasoline Direct Injection Engine Employing Dual Univalve System
(The American Society of Mechanical Engineers (ASME), 2019)Homogeneous charge compression ignition (HCCI) is a feasible combustion mode meeting future stringent emissions regulations, and has high efficiency and low NOX and particle emissions. As the narrow working condition range ... -
Experimental Force Coefficients for Two Sealed Ends Squeeze Film Dampers (Piston Rings and O-Rings): An Assessment of Their Similarities and Differences
(The American Society of Mechanical Engineers (ASME), 2019)Squeeze film dampers (SFDs) in aircraft engines effectively aid to reduce rotor motion amplitudes, in particular when traversing a critical speed, and help to alleviate rotor whirl instabilities. The current work is a ... -
A Thermoelastohydrodynamic Analysis for the Static Performance of High-Speed—Heavy Load Tilting-Pad Journal Bearing Operating in the Turbulent Flow Regime and Comparisons to Test Data
(The American Society of Mechanical Engineers (ASME), 2019)Tilting-pad journal bearings (TPJBs) ensure rotordynamic stability that could otherwise produce dangerously large amplitude rotor oil-whirl/whip motions in high-speed rotating machinery. Currently, highly efficient turbo ... -
Thermoacoustic Modes of Quasi-One-Dimensional Combustors in the Region of Marginal Stability
(The American Society of Mechanical Engineers (ASME), 2019)It may be generally believed that the thermoacoustic eigenfrequencies of a combustor with fully acoustically reflecting boundary conditions depend on both flame dynamics and geometry of the system. In this work, we show ... -
OH* Chemiluminescence Imaging of the Combustion Products From a Methane-Fueled Rotating Detonation Engine
(The American Society of Mechanical Engineers (ASME), 2019)Pressure gain combustion (PGC) has been conceived to convert fuel's chemical energy into thermal energy and mechanical energy, thereby reducing the entropy production in the process. Recent research has shown that the ... -
Large-Eddy Simulation of Buoyancy-Induced Flow in a Sealed Rotating Cavity
(The American Society of Mechanical Engineers (ASME), 2019)Buoyancy-induced flows occur in the rotating cavities of gas turbine internal air systems, and are particularly challenging to model due to their inherent unsteadiness. While the global features of such flows are well ... -
Rig and Engine Validation of the Nonlinear Forced Response Analysis Performed by the Tool OrAgL
(The American Society of Mechanical Engineers (ASME), 2019)Since the first nonlinear forced response validation of frictionally coupled bladed disks, more than 20 years have passed, and numerous incremental modeling and simulation refinements were proposed. With the present work, ... -
Reconstruction and Analysis of the Acoustic Transfer Matrix of a Reheat Flame From Large-Eddy Simulations
(The American Society of Mechanical Engineers (ASME), 2019)Lean premix technology is widely spread in gas turbine combustion systems, allowing modern power plants to fulfill very stringent emission targets. These systems are, however, also prone to thermoacoustic instabilities, ... -
Nonlinear Analysis of Rotordynamic Fluid Forces in the Annular Plain Seal by Using Extended Bulk-Flow Analysis: Influence of Static Eccentricity and Whirling Amplitude
(The American Society of Mechanical Engineers (ASME), 2019)Rotor-dynamic fluid force (RD fluid force) of turbomachinery is one of the causes of the shaft vibration problem. Bulk flow theory is the method for analyzing this RD fluid force, and it has been widely used in the design ... -
Influence of Nonaxisymmetric Confinement on the Hydrodynamic Stability of Multinozzle Swirl Flows
(The American Society of Mechanical Engineers (ASME), 2019)Interaction between coherent flow oscillations and the premixed flame sheet in combustors can result in coherent unsteadiness in the global heat release response. These coherent flow oscillations can either be self-excited ...