Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 3681-3700 of 9564
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Uncertainties of an Automated Optical 3D Geometry Measurement, Modeling, and Analysis Process for Mistuned Integrally Bladed Rotor Reverse Engineering
(The American Society of Mechanical Engineers (ASME), 2013)An automated reverse engineering process is developed that uses a structured light optical measurement system to collect dense point cloud geometry representations. The modeling process is automated through integration of ... -
Special Challenges in the Computational Fluid Dynamics Modeling of Transonic Turbo Expanders
(The American Society of Mechanical Engineers (ASME), 2013)High pressure ratio turboexpanders often put a strain on computational fluid dynamics (CFD) modeling. First of all, the working fluid is usually characterized by significant departures from the ideal behavior, thus requiring ... -
Avoiding Compressor Surge During Emergency Shutdown Hybrid Turbine Systems
(The American Society of Mechanical Engineers (ASME), 2013)A new emergency shutdown procedure for a directfired fuel cell turbine hybrid power system was evaluated using a hardwarebased simulation of an integrated gasifier/fuel cell/turbine hybrid cycle (IGFC), implemented through ... -
The Role of Dense Gas Dynamics on Organic Rankine Cycle Turbine Performance
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, we investigate the real gas flows which occur within organic Rankine cycle (ORC) turbines. A new method for the design of nozzles operating with dense gases is discussed, and applied to the case of a high ... -
Unified Applicable Propulsion System Performance Metrics
(The American Society of Mechanical Engineers (ASME), 2013)Progress in the development of electrical storage and conversion technology progressively attains focus in aerospace motive power research. Novel propulsion system concepts based on hybrid or even entirely electrical energy ... -
Enhanced Groove Geometry for Herringbone Grooved Journal Bearings
(The American Society of Mechanical Engineers (ASME), 2013)Although gaslubricated herringbone grooved journal bearings (HGJB) are known for high rotordynamic stability thresholds, small clearance to diameter ratios are required for stable rotor operation. Tight clearances not only ... -
Air Based Bottoming Cycles for Water Free Hybrid Solar Gas Turbine Power Plants
(The American Society of Mechanical Engineers (ASME), 2013)A thermoeconomic model of a novel hybrid solar gasturbine power plant with an airbased bottoming cycle has been developed, allowing its thermodynamic, economic, and environmental performance to be analyzed. Multiobjective ... -
Microstructural Evolution of GdZ and DySZ Based EB PVD TBC Systems After Thermal Cycling at High Temperature
(The American Society of Mechanical Engineers (ASME), 2013)Lower thermal conductivity and high temperature stability are the two properties which are highly desired from ceramic top coat materials in thermal barrier coating (TBC) systems. Gadolinium zirconate, Gd2Zr2O7 (GdZ) and ... -
Reduced Order Modeling Based on Complex Nonlinear Modal Analysis and Its Application to Bladed Disks With Shroud Contact
(The American Society of Mechanical Engineers (ASME), 2013)The design of bladed disks with contact interfaces typically requires analyses of the resonant forced response and flutterinduced limit cycle oscillations. The steadystate vibration behavior can efficiently be calculated ... -
Modeling of Abradable Coating Removal in Aircraft Engines Through Delay Differential Equations
(The American Society of Mechanical Engineers (ASME), 2013)In modern turbomachinery, abradable materials are implemented on casings to reduce operating tip clearances and mitigate direct unilateral contact occurrences between rotating and stationary components. However, both ... -
An Experimental and Theoretical Investigation of Wave Propagation in Teflon and Nylon Tubing With Methods to Prevent Aliasing in Pressure Scanners
(The American Society of Mechanical Engineers (ASME), 2013)Accurate static and dynamic pressure measurements provide the feedback needed to advance gas turbine efficiency and reliability as well as improve aircraft design and flight control. During turbine testing and aircraft ... -
On Using Fast Response Pressure Sensors in Aerodynamic Probes to Measure Total Temperature and Entropy Generation in Turbomachinery Blade Rows
(The American Society of Mechanical Engineers (ASME), 2013)This contribution addresses the possibility of exploiting the temperature dependency of piezoresistive sensors as a temperature measurement per se. This requires the characterization of the sensor, or the probe as a ... -
The Influence of Actual Layout and Off Axis Needle Stroke on Diesel Nozzle Flow Under Ballistic Needle Displacement
(The American Society of Mechanical Engineers (ASME), 2013)The injection of small amount of diesel fuel relies on the shortening of energizing signal. In such injection conditions, the needle does not reach the mechanical strokeend and its displacement is defined as ballistic. ... -
Three Dimensional Chemiluminescence Imaging of Unforced and Forced Swirl Stabilized Flames in a Lean Premixed Multi Nozzle Can Combustor
(The American Society of Mechanical Engineers (ASME), 2013)A tomographic image reconstruction technique has been developed to measure the 3D distribution of CH* chemiluminescence of unforced and forced turbulent premixed flames. Measurements are obtained in a lean premixed, ... -
Evaluation of Gas Turbine Outboard Bleed Air on Overall Engine Efficiency and CO2e Emission in Natural Gas Compressor Stations
(The American Society of Mechanical Engineers (ASME), 2013)Gas turbine (GT) engines employed in natural gas compressor stations operate in different modes depending on the power, turbine inlet temperature, and shaft speeds. These modes apply different sequencing of bleed valve ... -
Effect of Nanosecond Repetitively Pulsed Discharges on the Dynamics of a Swirl Stabilized Lean Premixed Flame
(The American Society of Mechanical Engineers (ASME), 2013)The effects of nanosecond repetitively pulsed (NRP) plasma discharges on the dynamics of a swirlstabilized lean premixed flame are experimentally investigated. Voltage pulses of 8 kV in amplitude and 10 ns in duration ... -
Analysis and Modeling of Entropy Modes in a Realistic Aeronautical Gas Turbine
(The American Society of Mechanical Engineers (ASME), 2013)A combustion instability in a combustor typical of aeroengines is analyzed and modeled thanks to a low order Helmholtz solver. A dynamic mode decomposition (DMD) is first applied to the large eddy simulation (LES) database. ... -
Influence of Tip Shape on Reynolds Number Sensitivity for a Seven Hole Pressure Probe
(The American Society of Mechanical Engineers (ASME), 2013)The effects of tip shape on Reynolds number sensitivity of a seven hole pressure probe are studied over a range of flows associated with practical use of turbomachinery. It is shown that at low flow angles the response of ... -
Application of a Statistical Methodology for Gas Turbine Degradation Prognostics to Alstom Field Data
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, a prognostic methodology is applied to gas turbine field data to assess its capability as a predictive tool for degradation effects. On the basis of the recordings of past behavior, the methodology provides ... -
Data Reconciliation and Suspect Measurement Identification for Gas Turbine Cogeneration Systems
(The American Society of Mechanical Engineers (ASME), 2013)Data reconciliation is widely used in the chemical process industry to suppress the influence of random errors in process data and help detect gross errors. Data reconciliation is currently seeing increased use in the power ...