Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2401-2420 of 9564
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A Rotordynamic, Thermal, and Thrust Load Performance Gas Bearing Test Rig and Test Results for Tilting Pad Journal Bearings and Spiral Groove Thrust Bearings
(The American Society of Mechanical Engineers (ASME), 2017)A high-speed gas bearing test rig was developed to characterize rotordynamic, thermal, and thrust load performance of gas bearings being developed for an oil-free turboexpander. The radial bearings (RBs) tested in this ... -
Characteristics of a Spherical-Seat TPJB With Four Methods of Directed Lubrication—Part I: Thermal and Static Performance
(The American Society of Mechanical Engineers (ASME), 2017)Static and thermal characteristics (measured and predicted) are presented for a four-pad, spherical-seat, tilting-pad journal bearing (TPJB) with 0.5 pivot offset, 0.6 L/D, 101.6 mm nominal diameter, and 0.3 preload in the ... -
Semi-Simplified Black-Box Dynamic Modeling of an Industrial Gas Turbine Based on Real Performance Characteristics
(The American Society of Mechanical Engineers (ASME), 2017)The use of multishaft industrial gas turbines is expanding in various industries because of variation in their structure, flexibility, and their appropriate power generation range. In this study, a semi-simplified black-box ... -
Experimental Investigation of Spray and Combustion Performances of a Fuel-Staged Low Emission Combustor: Effects of Main Swirl Angle
(The American Society of Mechanical Engineers (ASME), 2017)In order to reduce NOx emissions, modern gas turbines are often equipped with lean-burn combustion systems, where the high-velocity fuel-lean conditions that limit NOx formation in combustors also inhibit the ability of ... -
Model Predictive Engine Speed Control for Transmissions With Dog Clutches
(The American Society of Mechanical Engineers (ASME), 2017)The need for cost-effective fuel economy improvements has driven the introduction of automatic transmissions with an increasing number of gear ratios. Incorporation of interlocking dog clutches in these transmissions ... -
Enhancement to the Traditional Ellipse Law for More Accurate Modeling of a Turbine With a Finite Number of Stages
(The American Society of Mechanical Engineers (ASME), 2017)This paper studies the origin and applicability of the traditional Stodola ellipse law and demonstrates its deficiencies when applied in certain conditions. It extends the equation by Cooke and Traupel through the definition ... -
Application of Improved Artificial Bee Colony Algorithm to the Parameter Optimization of a Diesel Engine With Pilot Fuel Injections
(The American Society of Mechanical Engineers (ASME), 2017)Modern diesel engines are charged with the difficult problem of balancing emissions and efficiency. For this work, a variant of the artificial bee colony (ABC) algorithm was applied for the first time to the experimental ... -
Quasi-Dimensional Diesel Engine Combustion Modeling With Improved Diesel Spray Tip Penetration, Ignition Delay, and Heat Release Submodels
(The American Society of Mechanical Engineers (ASME), 2017)Increasingly stringent fuel economy and CO2 emission regulations provide a strong impetus for development of high-efficiency engine technologies. Diesel engines dominate the heavy duty market and significant segments of ... -
A Comparison of Single and Double Lip Rim Seal Geometries
(The American Society of Mechanical Engineers (ASME), 2017)The effect of the purge flow, engine-like blade pressure field, and mainstream flow coefficient are studied experimentally for a single and double lip rim seal. Compared to the single lip, the double lip seal requires less ... -
Flowfield and Performance Analysis of a Three-Dimensional TBCC Exhaust Nozzle
(The American Society of Mechanical Engineers (ASME), 2017)Compared to other engines, turbine-based combined cycle (TBCC) engine is one of the most suitable propulsion systems for hypersonic vehicle. Because of its fine reusability, wide flight envelope, and safety margins, TBCC ... -
A Combined Organic Rankine Cycle With Double Modes Used for Internal Combustion Engine Waste Heat Recovery
(The American Society of Mechanical Engineers (ASME), 2017)A combined organic Rankine cycle (ORC) was proposed for both engine coolant energy recovery (CER) and exhaust energy recovery (EER), and it was applied to a gasoline direct injection (GDI) engine to verify its waste heat ... -
Numerical Investigation of Creep–Fatigue Behavior in a Steam Turbine Inlet Valve Under Cyclic Thermomechanical Loading
(The American Society of Mechanical Engineers (ASME), 2017)The aim of this study was to investigate the cyclic creep–fatigue interaction behavior in a steam turbine inlet valve under cyclic thermomechanical loading conditions. Three years and nine iterations of idealized ... -
Detached Eddy Simulation Simulation of Asymmetrical Flow in a High Pressure Diesel Injector
(The American Society of Mechanical Engineers (ASME), 2017)Recent experiments have shown that the lateral motion of a high pressure injector needle can lead to significant asymmetrical flow in the sac and asymmetric spray pattern in the combustor, which in turn degrades the ... -
Large Eddy Simulation of Cylindrical Jet Breakup and Correlation of Simulation Results With Experimental Data
(The American Society of Mechanical Engineers (ASME), 2017)Modern engines with increasing power densities have put additional demands on pistons to perform in incrementally challenging thermal environments. Piston cooling is therefore of paramount importance for engine component ... -
Power Plant Output Augmentation by Evaporative Cooling Based on HRSG Blowdown Water Recycling in the Kingdom of Saudi Arabia: A Novel Approach
(The American Society of Mechanical Engineers (ASME), 2017)Water is a scarce natural resource fundamental for human life. Power plant architects, engineers, and power utilities owners must do everything within their hands and technical capabilities to decrease the usage of water ... -
Effect of Recess Shape on the Performance of a High-Speed Hybrid Journal Bearing
(The American Society of Mechanical Engineers (ASME), 2017)Hybrid bearings are getting more and more attention because of their ability to provide both hydrodynamic support for high-speed rotors and hydrostatic lift in low-speed conditions such as during startup. Hybrid bearings ... -
Full-Scale Turbofan Demonstration of a Deployable Engine Air-Brake for Drag Management Applications1
(The American Society of Mechanical Engineers (ASME), 2017)This paper presents the design and full-scale ground-test demonstration of an engine air-brake (EAB) nozzle that uses a deployable swirl vane mechanism to switch the operation of a turbofan's exhaust stream from thrust ... -
Performance of a Laser Ignited Multicylinder Lean Burn Natural Gas Engine
(The American Society of Mechanical Engineers (ASME), 2017)Market demands for lower fueling costs and higher specific powers in stationary natural gas engines have engine designs trending toward higher in-cylinder pressures and leaner combustion operation. However, ignition remains ... -
Numerical and Experimental Studies on a Syngas-Fired Ultra Low NOx Combustor
(The American Society of Mechanical Engineers (ASME), 2017)Simulations and exhaust measurements of temperature and pollutants in a syngas-fired model trapped vortex combustor for stationary power generation applications are reported. Numerical simulations employing Reynolds-averaged ... -
Measurements of Stretch Statistics at Flame Leading Points for High Hydrogen Content Fuels
(The American Society of Mechanical Engineers (ASME), 2017)Fuel composition has a strong influence on the turbulent flame speed, even at very high turbulence intensities. An important implication of this result is that the turbulent flame speed cannot be extrapolated from one fuel ...