Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2921-2940 of 9564
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Modeling of Start Up From Engine Off Conditions Using High Fidelity Turbofan Engine Simulations
(The American Society of Mechanical Engineers (ASME), 2016)Engine models are widely used to simulate the engine behavior at steady state and transient operating conditions over the full flight envelope. Within the engine development process such simulations are used to support ... -
Thermal Barrier Coating Validation Testing for Industrial Gas Turbine Combustion Hardware
(The American Society of Mechanical Engineers (ASME), 2016)As gas turbine (GT) temperatures have increased, thermal barrier coatings (TBCs) have become a critically important element in hot section component durability. Ceramic TBCs permit significantly increased gas temperatures, ... -
Integrated Weld Quality Concept—A Holistic Design Approach for Steam Turbine Rotor Weld Joints
(The American Society of Mechanical Engineers (ASME), 2016)The today's energy market requires highly efficient power plants under flexible operating conditions. Especially, the fluctuating availability of renewables demands higher cycling of fossil fired power plants. The need for ... -
A Comparison of a Mono , Twin , and Double Scroll Turbine for Automotive Applications
(The American Society of Mechanical Engineers (ASME), 2016)As a means of meeting ever increasing emissions and fuel economy demands, car manufacturers are using aggressive engine downsizing. To maintain the power output of the engine, turbocharging is typically used. Due to the ... -
Bump Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil Free Automotive Turbochargers: Highlights in Rotordynamic Performance
(The American Society of Mechanical Engineers (ASME), 2016)Oilfree turbochargers (TCs) require gas bearings in compact units of enhanced rotordynamic stability, mechanical efficiency, and improved reliability with reduced maintenance costs compared with oillubricated bearings. ... -
Effect of Slot Injection and Effusion Array on the Liner Heat Transfer Coefficient of a Scaled Lean Burn Combustor With Representative Swirling Flow
(The American Society of Mechanical Engineers (ASME), 2016)International standards regarding polluting emissions from civil aircraft engines are becoming gradually even more stringent. Nowadays, the most prominent way to meet the target of reducing NOx emissions in modern aeroengine ... -
Effect of Ingress on Turbine Disks
(The American Society of Mechanical Engineers (ASME), 2016)The ingress of hot gas through the rim seal of a gas turbine depends on the pressure difference between the mainstream flow in the turbine annulus and that in the wheelspace radially inward of the seal. This paper describes ... -
Gas Turbine Blade Heat Transfer Augmentation by Impingement of Air Jets Having Various Configurations
(The American Society of Mechanical Engineers (ASME), 1972)An experimental investigation of heat transfer characteristics for various configurations of air jets impinging on the leading edge inner surface of the blade wall is presented. Three configurations ... -
The Three Dimensional Structure of Swirl Stabilized Flames in a Lean Premixed Multinozzle Can Combustor
(The American Society of Mechanical Engineers (ASME), 2016)Flame structure can have a significant effect on a combustor's static stability (resistance to blowoff) and dynamic stability (combustion instability) and therefore is an important aspect of the combustion process that ... -
Diesel Spray Rate of Momentum Measurement Uncertainties and Diagnostic Considerations
(The American Society of Mechanical Engineers (ASME), 2016)Interpretation of combustion and emissions outcomes in diesel engines is often enhanced by accurate knowledge of the transient fuel delivery rate and flow characteristics of the injector nozzle. Important physical ... -
Intermittency Route to Combustion Instability in a Laboratory Spray Combustor
(The American Society of Mechanical Engineers (ASME), 2016)In the present study, we investigate the phenomenon of transition of a thermoacoustic system involving twophase flow, from aperiodic oscillations to limit cycle oscillations. Experiments were performed in a laboratory scale ... -
Assessment of the Indirect Combustion Noise Generated in a Transonic High Pressure Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2016)Indirect combustion noise, generated by the acceleration and distortion of entropy waves through the turbine stages, has been shown to be the dominant noise source of gas turbines at lowfrequencies and to impact the ... -
Design Space of Foil Bearings for Closed Loop Supercritical CO2 Power Cycles Based on Three Dimensional Thermohydrodynamic Analyses
(The American Society of Mechanical Engineers (ASME), 2016)The closedloop Brayton cycle with supercritical CO2 (SCO2) as an operating fluid is an attractive alternative to conventional power cycles due to very high power density. Foil gas bearings using CO2 are the most promising ... -
Coupled Aerothermal Modeling of a Rotating Cavity With Radial Inflow
(The American Society of Mechanical Engineers (ASME), 2016)Flow and heat transfer in an aeroengine compressor disk cavity with radial inflow has been studied using computational fluid dynamics (CFD), large eddy simulation (LES), and coupled fluid/solid modeling. Standalone CFD ... -
Thermodynamics and Fluid Mechanics of a Closed Blade Cascade Wind Tunnel for Organic Vapors
(The American Society of Mechanical Engineers (ASME), 2016)The organic Rankine cycle (ORC) offers great potential for waste heat recovery and use of lowtemperature sources for power generation. However, the ORC thermal efficiency is limited by the relatively lowtemperature level, ... -
A Comparison of Modeling Techniques for Polydispersed Droplet Spectra in Steam Turbines
(The American Society of Mechanical Engineers (ASME), 2016)Within steam turbine flows, condensation phenomena give rise to complex droplet spectra that can span more than two orders of magnitude in size. To predict the behavior of the twophase flow and the resulting losses, the ... -
Computational Fluid Dynamics Modeling of Low Pressure Steam Turbine Radial Diffuser Flow by Using a Novel Multiple Mixing Plane Based Coupling—Simulation and Validation
(The American Society of Mechanical Engineers (ASME), 2016)The diffuser and exhaust of low pressure steam turbines show significant impact on the overall turbine performance. The amount of recovered enthalpy leads to a considerable increase of the turbine power output, and therefore ... -
Heat Transfer Augmentation Due to Coolant Extraction on the Cold Side of Active Clearance Control Manifolds
(The American Society of Mechanical Engineers (ASME), 2016)Jet array is an arrangement typically used to cool several gas turbine parts. Some examples of such applications can be found in the impingement cooled region of gas turbine airfoils or in the turbine blade tip clearances ... -
Metal Temperature Prediction of a Dry Low NOx Class Flame Tube by Computational Fluid Dynamics Conjugate Heat Transfer Approach
(The American Society of Mechanical Engineers (ASME), 2016)Combustor liner of present gas turbine engines is subjected to high thermal loads as it surrounds high temperature combustion reactants and is hence facing the related radiative load. This generally produces high thermal ... -
An Analysis of Flow Through a Mixed Flow Impeller
(The American Society of Mechanical Engineers (ASME), 1972)In this report, a method of analyzing steady, three-dimensional, subsonic, nonviscous flow through a turbomachine with arbitrary hub and shroud shapes and with a finite number of blades is ...