Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1921-1940 of 9564
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Numerical and Experimental Investigation on an Effusion-Cooled Lean Burn Aeronautical Combustor: Aerothermal Field and Emissions
(The American Society of Mechanical Engineers (ASME), 2019)Lean burn combustion is increasing its popularity in the aeronautical framework due to its potential in reducing drastically pollutant emissions (NOx and soot in particular). Its implementation, however, involves significant ... -
Unsteady Responses of the Impeller of a Centrifugal Compressor Exposed to Pulsating Backpressure
(The American Society of Mechanical Engineers (ASME), 2019)The flow in intake manifold of a heavily downsized internal combustion engine has increased levels of unsteadiness due to the reduction of cylinder number and manifold arrangement. The turbocharger compressor is thus exposed ... -
Foreign Object Damage Behavior of a Silicon Carbide Fibrous Ceramic Composite
(The American Society of Mechanical Engineers (ASME), 2019)The response of a silicon carbide (SiC) fibrous ceramic composite to foreign object damage (FOD) was determined at ambient temperature and velocities ranging from 40 to 150 m/s. Target specimens were impacted, at a normal ... -
Improvement of Steam Turbine Stage Efficiency by Controlling Rotor Shroud Leakage Flows—Part I: Design Concept and Typical Performance of a Swirl Breaker
(The American Society of Mechanical Engineers (ASME), 2019)In high and intermediate pressure (HIP) steam turbines with shrouded blades, it is well known that shroud leakage losses contribute significantly to overall losses. Shroud leakage flow with a large tangential velocity ... -
Improvement of Steam Turbine Stage Efficiency by Controlling Rotor Shroud Leakage Flows—Part II: Effect of Axial Distance Between a Swirl Breaker and a Rotor Shroud on Efficiency Improvement
(The American Society of Mechanical Engineers (ASME), 2019)The basic principle of a distinct idea to reduce an aerodynamic mixing loss induced by the difference in tangential velocity between mainstream flow and rotor shroud leakage flow is presented in “Part I: Design Concept and ... -
Design and Numerical Analysis of a Vane Shaped Receiver Hole in a Cover-Plate Preswirl System
(The American Society of Mechanical Engineers (ASME), 2019)In a cover-plate system, rotating receiver hole is an important component, because its structure and characteristics directly influence the aerodynamic loss and cooling performance in the preswirl system. A new type of ... -
Numerical Assessment of Reduced Order Modeling Techniques for Dynamic Analysis of Jointed Structures With Contact Nonlinearities
(The American Society of Mechanical Engineers (ASME), 2019)This work presents an assessment of classical and state of the art reduced order modeling (ROM) techniques to enhance the computational efficiency for dynamic analysis of jointed structures with local contact nonlinearities. ... -
Vibration-Based Condition Monitoring of Wind Turbine Gearboxes Based on Cyclostationary Analysis
(The American Society of Mechanical Engineers (ASME), 2019)Wind industry experiences a tremendous growth during the last few decades. As of the end of 2016, the worldwide total installed electricity generation capacity from wind power amounted to 486,790 MW, presenting an increase ... -
Numerical Investigations of an Axial Exhaust Diffuser Coupling the Last Stage of a Generic Gas Turbine
(The American Society of Mechanical Engineers (ASME), 2019)It is well known that the last stage of a turbine and the subsequent diffuser should be viewed at and designed as a coupled system rather than as single standalone components. The turbine outlet flow imposes the inlet ... -
The Investigation of Geometric Parameters on the Injection Characteristic of the High Pressure Common-Rail Injector
(The American Society of Mechanical Engineers (ASME), 2019)According the actual structure and working principle of a fuel injector to build a model of the common-rail injector, including the control valve, the solenoid valve, and the needle valve of the injector. The model includes ... -
Effect of Geometric Parameters on Mean Drop Sizes From Dual-Orifice Pressure Nozzles
(The American Society of Mechanical Engineers (ASME), 2019)Experimental studies have been conducted to investigate the effect of nozzle geometries on the atomization. Extensive measurements of mean drop size are conducted on the 15 dual-orifice pressure nozzles. These nozzles ... -
Leakage and Dynamic Force Coefficients for Two Labyrinth Gas Seals: Teeth-on-Stator and Interlocking Teeth Configurations. A Computational Fluid Dynamics Approach to Their Performance
(The American Society of Mechanical Engineers (ASME), 2019)Labyrinth gas seals (LSs) commonly used in turbomachines reduce secondary flow leakage. Conventional see-through labyrinth seal designs include either all teeth-on-stator (TOS) or all teeth-on-rotor (TOR). Experience shows ... -
Fuel Variation Effects in Propagation and Stabilization of Turbulent Counter-Flow Premixed Flames
(The American Society of Mechanical Engineers (ASME), 2019)Sensitivity to stretch and differential diffusion of chemical species are known to influence premixed flame propagation, even in the turbulent environment where mass diffusion can be greatly enhanced. In this context, it ... -
A Method for Parametric Analysis of Stability Boundaries for Nonlinear Periodic Vibrations of Structures With Contact Interfaces
(The American Society of Mechanical Engineers (ASME), 2019)A method for parametric analysis of the stability loss boundary has been developed for periodic regimes of nonlinear forced vibrations for a first time. The method allows parametric frequency-domain calculations of the ... -
Optimization of a 900 mm Tilting-Pad Journal Bearing in Large Steam Turbines by Advanced Modeling and Validation
(The American Society of Mechanical Engineers (ASME), 2019)Modernization of steam turbine components can extend power plant lifetime, decrease maintenance costs, increase service intervals, and improve operational flexibility. However, this can also lead to challenging demands for ... -
Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors
(The American Society of Mechanical Engineers (ASME), 2019)Experimental research was conducted into a scooped rotor system that captures oil from a stationary jet and directs it through passages within the shaft to another axial location. Such a system has benefits for delivering ... -
A Method to Analyze the Contact Stress of Dovetail Attachments in Aeroengine
(The American Society of Mechanical Engineers (ASME), 2019)Finite element method (FEM) has been used to find out the fundamental reason of shape function due to the nonconvergence of stress in calculating the trapezoidal tooth dovetail attachments of aeroengine. We have used two ... -
Flow Inhomogeneities in a Realistic Aeronautical Gas-Turbine Combustor: Formation, Evolution, and Indirect Noise
(The American Society of Mechanical Engineers (ASME), 2019)Indirect noise generated by the acceleration of combustion inhomogeneities is an important aspect in the design of aero-engines because of its impact on the overall noise emitted by an aircraft and the possible contribution ... -
Quantification and Propagation of Uncertainties in Identification of Flame Impulse Response for Thermoacoustic Stability Analysis
(The American Society of Mechanical Engineers (ASME), 2019)The thermoacoustic behavior of a combustion system can be determined numerically via acoustic tools such as Helmholtz solvers or network models coupled with a model for the flame dynamic response. Within such a framework, ... -
Thermo-Mechanical Modeling of Abradable Coating Wear in Aircraft Engines
(The American Society of Mechanical Engineers (ASME), 2019)In modern turbomachine designs, the nominal clearances between rotating bladed-disks and their surrounding casing are reduced to improve aerodynamic performances of the engine. This clearance reduction increases the risk ...