Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2601-2620 of 9564
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Full Three-Dimensional Rotor/Stator Interaction Simulations in Aircraft Engines With Time-Dependent Angular Speed
(The American Society of Mechanical Engineers (ASME), 2017)Modern aircraft engine designs feature reduced clearances that may initiate structural contacts between rotating and static components. A numerical strategy dedicated to the simulation of such interactions is here enriched ... -
A Large-Eddy Simulation–Linear-Eddy Model Study of Preferential Diffusion Processes in a Partially Premixed Swirling Combustor With Synthesis Gases
(The American Society of Mechanical Engineers (ASME), 2017)A lean partially premixed swirling combustor operated with synthesis gases is studied using large-eddy simulation (LES). The linear-eddy model (LEM) is employed to close the unresolved scalar fluxes with the nonunity Lewis ... -
Automatic Detection of Defects in a Swirl Burner Array Through an Exhaust Jet Pattern Analysis
(The American Society of Mechanical Engineers (ASME), 2017)A significant challenge in improving the regeneration process of jet engines is the reduction of engine down-time during inspection. As such, early defect detection without engine disassembly will speed up the regeneration ... -
Performance Investigation of Cycle-Integrated Parallel Hybrid Turboshafts
(The American Society of Mechanical Engineers (ASME), 2017)Motivated by the long-term target settings for research and innovation in Europe and in North America, initial investigations of parallel hybrid electric power plant systems have indicated significant in-flight fuel reduction ... -
Experimental Investigation of Stall and Surge in a Multistage Compressor
(The American Society of Mechanical Engineers (ASME), 2017)Flow instability conditions, in particular during surge and stall phenomena, have always influenced the operational reliability of turbocompressors and have attracted significant interest resulting in extensive literature. ... -
Micro-Turbojet to Turbofan Conversion Via Continuously Variable Transmission: Thermodynamic Performance Study
(The American Society of Mechanical Engineers (ASME), 2017)In this study, the viability, performance, and characteristics of a turbojet-to-turbofan conversion through the use of a continuously variable transmission (CVT) are investigated. By an in-house thermodynamic simulation ... -
Methods for the Extraction and Analysis of the Global Mode in Swirling Jets Undergoing Vortex Breakdown
(The American Society of Mechanical Engineers (ASME), 2017)Swirling jets undergoing vortex breakdown are widely used in combustion applications, due to their ability to provide aerodynamic flame stabilization. It is well known that vortex breakdown is accompanied by a dominant ... -
Heat Transfer Correction Methods for Turbocharger Performance Measurements
(The American Society of Mechanical Engineers (ASME), 2017)Turbocharger performance maps used for the matching process with a combustion engine are measured on test benches which do not exhibit the same boundary conditions as the engine. However, these maps are used in engine ... -
Effects of Airfoil's Polar Data in the Stall Region on the Estimation of Darrieus Wind Turbine Performance
(The American Society of Mechanical Engineers (ASME), 2017)Interest in vertical-axis wind turbines (VAWTs) is experiencing a renaissance after most major research projects came to a standstill in the mid 1990s, in favor of conventional horizontal-axis turbines (HAWTs). Nowadays, ... -
A Water-Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance
(The American Society of Mechanical Engineers (ASME), 2017)Process fluid-lubricated thrust bearings (TBs) in a turbomachine control rotor placement due to axial loads arising from pressure fields on the front shroud and back surface of impellers. To date, prediction of aerodynamic-induced ... -
Coordinated Control of Gas and Steam Turbines for Efficient Fast Start-Up of Combined Cycle Power Plants
(The American Society of Mechanical Engineers (ASME), 2017)In the fast start-up for combined cycle power plants (CCPP), the thermal stresses of the steam turbine rotor are generally controlled by the steam temperatures or flow rates by using gas turbines (GTs), steam turbines, and ... -
A Multiscale Approach for Nonlinear Dynamic Response Predictions With Fretting Wear
(The American Society of Mechanical Engineers (ASME), 2017)Accurate prediction of the vibration response of aircraft engine assemblies is of great importance when estimating both the performance and the lifetime of their individual components. In the case of underplatform dampers, ... -
Investigation on Flow-Induced Vibrations of a Steam Turbine Inlet Valve Considering Fluid–Structure Interaction Effects
(The American Society of Mechanical Engineers (ASME), 2017)The power output of steam turbines is controlled by steam turbine inlet valves. These valves have a large flow capacity and dissipate a huge amount of energy in throttled operation. The dissipation process generates strong ... -
Stability Analysis of Multiharmonic Nonlinear Vibrations for Large Models of Gas Turbine Engine Structures With Friction and Gaps
(The American Society of Mechanical Engineers (ASME), 2017)An efficient method is proposed for the multiharmonic frequency-domain analysis of the stability for nonlinear periodic forced vibrations in gas turbine engine structures and turbomachines with friction, gaps, and other ... -
Periodicity and Stability in Transverse Motion of a Nonlinear Rotor-Bearing System Using Generalized Harmonic Balance Method
(The American Society of Mechanical Engineers (ASME), 2017)Many rotor assemblies of industrial turbomachines are supported by oil-lubricated bearings. It is well known that the operation safety of these machines is highly dependent on rotors whose stability is closely related to ... -
Finite Element Analysis of the Effects of Thermally Grown Oxide Thickness and Interface Asperity on the Cracking Behavior Between the Thermally Grown Oxide and the Bond Coat
(The American Society of Mechanical Engineers (ASME), 2017)Finite element simulations based on an interface cohesive zone model (CZM) have been developed to mimic the interfacial cracking behavior between the α−Al2O3 thermally grown oxide (TGO) and the aluminum-rich Pt–Al metallic ... -
A Fully Coupled Fluid–Structure Interaction Model for Foil Gas Bearings
(The American Society of Mechanical Engineers (ASME), 2017)Foil gas bearings are self-acting, compliant-surface hydrodynamic bearings that usually use air or other process gas as their working fluid or lubricant. Foil gas bearings are made of one or more bump foils, which are ... -
Low-Leakage Shaft-End Seals for Utility-Scale Supercritical CO2 Turboexpanders
(The American Society of Mechanical Engineers (ASME), 2017)Supercritical carbon dioxide (sCO2) power cycles could be a more efficient alternative to steam Rankine cycles for power generation from coal. Using existing labyrinth seal technology, shaft-end-seal leakage can result in ... -
Temperature Measurements at the Outlet of a Lean Burn Single-Sector Combustor by Laser Optical Methods
(The American Society of Mechanical Engineers (ASME), 2017)High overall pressure ratio (OPR) engine cycles for reduced NOx emissions will generate new aggravated requirements and boundary conditions by implementing low emission combustion technologies into advanced engine ... -
Prediction of Confined Flame Flashback Limits Using Boundary Layer Separation Theory
(The American Society of Mechanical Engineers (ASME), 2017)Premixed combustion is a common technology applied in modern gas turbine combustors to minimize nitrogen oxide emissions. However, early mixing of fuel and oxidizer opens up the possibility of flame flashback into the ...