Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1701-1720 of 9564
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On the Validity of Scaling Transient Conjugate Heat Transfer Characteristics
(The American Society of Mechanical Engineers (ASME), 2020)Accurate prediction of unsteady thermal loads is of paramount importance in several engineering disciplines and applications. Performing time-accurate unsteady conjugate heat transfer (CHT) simulations presents considerable ... -
A Starting Control Strategy of Single-Cylinder Two-Stroke Free-Piston Engine Generator
(The American Society of Mechanical Engineers (ASME), 2020)Free-piston engine generator is a novel energy conversion system, which is known to have advantages of variable compression ratio and variable fuel. The free-piston must be controlled to overcome challenges like misfire, ... -
Air-Assisted Atomization at Constant Mass and Momentum Flow Rate: Investigation into the Ambient Pressure Influence With the Smoothed Particle Hydrodynamics Method
(The American Society of Mechanical Engineers (ASME), 2020)A twin-fluid atomizer configuration is simulated by means of the two-dimensional (2D) weakly compressible smoothed particle hydrodynamics (SPH) method and compared to experiments. The gas-to-liquid ratio (GLR), the momentum ... -
Considerations for Using Additive Manufacturing Technology in Centrifugal Compressor Research
(The American Society of Mechanical Engineers (ASME), 2020)An additive manufactured (AM) vaned diffuser for use in a centrifugal compressor research facility was designed and implemented. Utilizing an AM process to manufacture the diffuser reduces the long lead time that is ... -
Stochastic Fatigue Life Prediction Based on a Reduced Data Set
(The American Society of Mechanical Engineers (ASME), 2020)The aim of this paper is to provide a novel stochastic life prediction approach capable of predicting the total fatigue life of applied uniaxial stress states from a reduced dataset reliably and efficiently. A previously ... -
Modeling and Quantification of Acoustic Damping Induced by Vortex Shedding in Noncompact Thermoacoustic Systems
(The American Society of Mechanical Engineers (ASME), 2020)This paper presents a methodology to compute acoustic damping rates of transversal, high-frequency modes induced by vortex-shedding. The acoustic damping rate presents one key quantity for the assessment of the linear ... -
Experimental Analysis of a Micro Gas Turbine Combustor Optimized For Flexible Operation With Various Gaseous Fuel Compositions
(The American Society of Mechanical Engineers (ASME), 2020)With the push to curb dangerous atmospheric pollutant production, energy generation technologies that reduce green-house gas emissions, while still providing adequate electrical supply, are of high importance. With major ... -
Effect of CO2 Dilution on the Laminar Burning Velocities of Premixed Methane/Air Flames at Elevated Temperature
(The American Society of Mechanical Engineers (ASME), 2020)With increased interest in reducing emissions, the staged combustion concept for gas turbine combustors is gaining in popularity. For this work, the effect of CO2 dilution on laminar burning velocities of premixed methane/air ... -
Pressure Profile Measurements Within the Gas Film of Journal Foil Bearings Using an Instrumented Rotor With Telemetry
(The American Society of Mechanical Engineers (ASME), 2020)Foil bearings are strong candidates to support oil-free turbomachinery. Although foil bearings are a widely used technology, models describing their behavior are not validated using the film pressure, which is the fundamental ... -
Preswirl and Mixed-Flow (Mainly Liquid) Effects on Rotordynamic Performance of a Long (L/D = 0.75) Smooth Seal
(The American Society of Mechanical Engineers (ASME), 2020)Measured results are presented for rotordynamic coefficients and mass leakage rates of a long smooth annular seal (length-to-diameter ratio L/D = 0.75, diameter D = 114.686 mm, and radial clearance Cr = 0.200 mm) tested ... -
Assessing Additive Manufacturing Repeatability of Inherently Damped Nickel Alloy Components
(The American Society of Mechanical Engineers (ASME), 2020)The repeatability of an additive manufacturing (AM) process that fabricates a unique specimen with inherent damping capability is explored. A laser powder bed fusion (LPBF) technique is used to additively manufacture nickel ... -
Vibration-Based Condition Monitoring of Helicopter Gearboxes Based on Cyclostationary Analysis
(The American Society of Mechanical Engineers (ASME), 2020)The core of a helicopter drivetrain is a complex planetary main gearbox (MGB), which reduces the high input speed generated by the engines in order to provide the appropriate torque to the main rotors and to other auxiliary ... -
Effect of Fuel Nozzle Geometry on Swirling Partially Premixed Methane Flames
(The American Society of Mechanical Engineers (ASME), 2020)This paper presents an experimental study of the effect of fuel nozzle geometry on swirling partially premixed methane flames, where the focus is put on the ensuing flowfield and its role on coherent structures' suppression. ... -
A Probabilistic Uncertainty Estimation Method for Turbulence Parameters Measured by Hot-Wire Anemometry in Short-Duration Wind Tunnels
(The American Society of Mechanical Engineers (ASME), 2020)A robust and complete uncertainty estimation method is developed to quantify the uncertainty of turbulence quantities measured by hot-wire anemometry (HWA) at the inlet of a short-duration turbine test rig. The uncertainty ... -
On the Interaction of Swirling Flames in a Lean Premixed Combustor
(The American Society of Mechanical Engineers (ASME), 2020)Premixed or partially premixed swirling flames are widely used in gas turbine applications because of their compactness, high ignition efficiency, low NOx emissions and flame stability. A typical annular combustor consists ... -
Solar Desalination Based on Micro Gas Turbines Driven by Parabolic Dish Collectors
(The American Society of Mechanical Engineers (ASME), 2020)This paper presents the preliminary design and techno-economic assessment of an innovative solar system for the simultaneous production of water and electricity at small scale, based on the combination of a solar micro gas ... -
Experiments on a Large Flexure Pivot Journal Bearing: Summary of Test Results and Comparison With Predictions
(The American Society of Mechanical Engineers (ASME), 2020)Flexure pivot® journal bearings (FPJBs) have typically been used in small high-speed applications such as integrally geared compressors and multistage high-speed compressors, where the temperature management and the ... -
Condition Monitoring of Wind Turbine Planetary Gearboxes Under Different Operating Conditions
(The American Society of Mechanical Engineers (ASME), 2020)Digitally enhanced services for wind power could reduce operations and maintenance costs as well as the levelized cost of energy. Therefore, there is a continuous need for advanced monitoring techniques, which can exploit ... -
Experimental Study on the Emissions Characteristics of a Premixed Axial-Fuel-Staged Model Combustor
(The American Society of Mechanical Engineers (ASME), 2020)Axial-fuel-staged combustion is a promising technology to reduce NOx emission at high turbine inlet temperatures and provide extended gas turbine operational flexibility. To investigate the emissions characteristics of the ... -
Blade Vibration Stress Determination Method Based on Blade Tip Timing Simulator and Finite Element Method
(The American Society of Mechanical Engineers (ASME), 2020)Blade tip timing (BTT) measurement technology is more widely used to determine the vibrational stress of rotating blades and play an important role for blade service life prediction. The dynamic blade displacements can be ...