Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2981-3000 of 9564
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Advanced Rayleigh Pressure Loss Model for High Swirl Combustion in a Rotating Combustion Chamber
(The American Society of Mechanical Engineers (ASME), 2016)This paper considers the effect of excessive total pressure losses for heat transfer problems in fluid flows with a high circumferential swirl component. At RWTH Aachen University, a novel gas generator concept is under ... -
Experimental and Numerical Calculation of Turbulent Timescales at the Exit of an Engine Representative Combustor Simulator
(The American Society of Mechanical Engineers (ASME), 2016)To deepen the knowledge of the interaction between modern lean burn combustors and high pressure (HP) turbines, a nonreactive real scale annular trisector combustor simulator (CS) has been assembled at University of Florence ... -
Isothermal and Cyclic Oxidation Performance of Vertically Cracked and Columnar Thermal Barrier Coating Structures Produced Using Axial Suspension Plasma Spraying Process
(The American Society of Mechanical Engineers (ASME), 2016)Oxidation performance of thermal barrier coatings (TBCs) deposited by the axial suspension plasma spraying (ASPS) method was evaluated under isothermal and cyclic conditions with a peak temperature of 1080 آ°C. The TBC ... -
Regression Based Modeling of a Fleet of Gas Turbine Engines for Performance Trending
(The American Society of Mechanical Engineers (ASME), 2016)Module performance analysis is a wellestablished framework to assess changes in the health condition of the components of the engine gaspath. The primary material of the technique is the socalled vector of residuals, which ... -
Design of an Improved Turbine Rim Seal
(The American Society of Mechanical Engineers (ASME), 2016)Rim seals are fitted in gas turbines at the periphery of the wheelspace formed between rotor disks and their adjacent casings. These seals, also called platform overlap seals, reduce the ingress of hot gases which can limit ... -
The Interaction of Air Motion, Fuel Spray, and Combustion in the Diesel Combustion Process
(The American Society of Mechanical Engineers (ASME), 1972)This paper is pertinent mainly to combustion in open-chamber diesel engines employing air swirl. It is shown how an increase in air swirl rate can cause a marked loss of combustion efficiency ... -
Interaction of Flame Flashback Mechanisms in Premixed Hydrogen–Air Swirl Flames
(The American Society of Mechanical Engineers (ASME), 2016)An experimental study is presented on the interaction of flashback originating from flame propagation in the boundary layer (1), from combustion driven vortex breakdown (2) and from low bulk flow velocity (3). In the ... -
Orbit Model Force Coefficients for Fluid Film Bearings: A Step Beyond Linearization
(The American Society of Mechanical Engineers (ASME), 2016)Highperformance turbomachinery demands high shaft speeds, increased rotor flexibility, tighter clearances in the flow passages, advanced materials, and increased tolerance to imbalances. Operation at high speeds induces ... -
Structural and Rotordynamic Force Coefficients of a Shimmed Bump Foil Bearing: An Assessment of a Simple Engineering Practice
(The American Society of Mechanical Engineers (ASME), 2016)High speed rotors supported on bumptype foil bearings (BFBs) often suffer from large subsynchronous whirl motions. Mechanically preloading BFBs through shimming is a common, low cost practice that shows improvements in ... -
Assessment of Cavitation Models for Flows in Diesel Injectors With Single and Two Fluid Approaches
(The American Society of Mechanical Engineers (ASME), 2016)Several recent cavitation models for the analysis of twophase flows in diesel injectors with singleand twofluid modeling approaches have been evaluated, including the Saha–AbuRamandan–Li (SAL), Schnerr–Sauer (SS), ... -
Aeroelastic Instability in Transonic Fans
(The American Society of Mechanical Engineers (ASME), 2016)This paper describes stall flutter, which can occur at part speed operating conditions near the stall boundary. Although it is called stall flutter, this phenomenon does not require the stalling of the fan blade in the ... -
Experimental Investigation of the Transition Mechanism From Stable Flame to Flashback in a Generic Premixed Combustion System With High Speed Micro Particle Image Velocimetry and Micro PLIF Combined With Chemiluminescence Imaging
(The American Society of Mechanical Engineers (ASME), 2016)Sustainable power generation resulting in low pollutant emissions, such as CO2 and NOx, poses a very challenging task in the near future. Premixed combustion of hydrogenrich fuels in gas turbines is a promising approach ... -
Characterization of Emissions From the Use of Alternative Aviation Fuels
(The American Society of Mechanical Engineers (ASME), 2016)Alternative fuels for aviation are now a reality. These fuels not only reduce reliance on conventional petroleumbased fuels as the primary propulsion source, but also offer promise for environmental sustainability. While ... -
Forced Coefficients for a Short Length, Open Ends Squeeze Film Damper With End Grooves: Experiments and Predictions
(The American Society of Mechanical Engineers (ASME), 2016)Squeeze film dampers (SFDs) are effective to ameliorate shaft vibration amplitudes and to suppress instabilities in rotor–bearing systems. Compact aero jet engines implement ultrashort length SFDs (L/D ≤ 0.2) to ... -
A Preliminary Design Tradeoff Study for an Advanced Propulsion Technology Rotorcraft at Mission Level
(The American Society of Mechanical Engineers (ASME), 2016)This paper aims to present an integrated rotorcraft (RC) multidisciplinary simulation framework, deployed for the comprehensive assessment of combined RC–powerplant systems at mission level. The proposed methodology ... -
Stress Distributions in Some Diesel Engine Crankshafts
(The American Society of Mechanical Engineers (ASME), 1972)Models of single throws of overlapped crankshafts have been loaded by free and restrained torsion, radial and tangential forces and bending moments, and by axial tension. Stress distributions ... -
Structural Characterization of a Novel Gas Foil Bearing With Nested Compression Springs: Analytical Modeling and Experimental Measurement
(The American Society of Mechanical Engineers (ASME), 2016)A novel nested compression spring gas foil bearing (NSFB), which used a series of nested compression springs as compliant supporting structure, was proposed and designed. NSFBs can be easily manufactured and are able to ... -
Performance of Inlet Filtration System in Relation to the Uncaptured Particles Causing Fouling in the Gas Turbine Compressor
(The American Society of Mechanical Engineers (ASME), 2016)Accounting for the impact of uncaptured particles that cause compressor fouling and subsequently performance degradation when a filter system is in place is often ignored when evaluating the performance of filtration ... -
Estimation of the Particle Deposition on a Transonic Axial Compressor Blade
(The American Society of Mechanical Engineers (ASME), 2016)Solid particle ingestion is one of the principal degradation mechanisms in the compressor section of heavyduty gas turbines. Usually, foulants in the ppm range, not captured by the air filtration system, i.e., (0–2) خ¼m ... -
Quantitative Computational Fluid Dynamics Analyses of Particle Deposition on a Subsonic Axial Compressor Blade
(The American Society of Mechanical Engineers (ASME), 2016)In literature, there are some studies related to the fouling phenomena in transonic compressors, but, in industrial applications (heavyduty compressor, pumping stations, etc.) the subsonic compressors are widespread. It ...