Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 5161-5180 of 9564
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Lean Blowout Limits and NOx Emissions of Turbulent, Lean Premixed, Hydrogen-Enriched Methane/Air Flames at High Pressure
(The American Society of Mechanical Engineers (ASME), 2007)Flame stability is a crucial issue in low NOx combustion systems operating at extremely lean conditions. Hydrogen enrichment seems to be a promising option to extend lean blowout limits (LBO) ... -
Combustion Oscillation Monitoring Using Flame Ionization in a Turbulent Premixed Combustor
(The American Society of Mechanical Engineers (ASME), 2007)To achieve very low NOx emission levels, lean-premixed gas turbine combustors have been commercially implemented that operate near the fuel-lean flame extinction limit. Near the lean limit, ... -
Gas Turbine Combustion Technology Reducing Both Fuel-NOx and Thermal-NOx Emissions for Oxygen-Blown IGCC With Hot/Dry Synthetic Gas Cleanup
(The American Society of Mechanical Engineers (ASME), 2007)In order to improve the thermal efficiency of the oxygen-blown integrated gasification combined cycle (IGCC) and to meet stricter environmental restrictions among cost-effective options, a hot/dry ... -
Characterization of Porous Carbon Foam as a Material for Compact Recuperators
(The American Society of Mechanical Engineers (ASME), 2007)Experiments are presented to quantify the convective heat transfer and hydrodynamic loss that is obtained by forcing water through blocks of porous carbon foam (PCF) heated from one side. The ... -
Components Map Generation of Gas Turbine Engine Using Genetic Algorithms and Engine Performance Deck Data
(The American Society of Mechanical Engineers (ASME), 2007)In order to estimate the gas turbine engine performance precisely, the component maps containing their own performance characteristics should be used. Because the components map is an engine ... -
Investigation of Entropy Noise in Aero-Engine Combustors
(The American Society of Mechanical Engineers (ASME), 2007)Strong evidence is presented that entropy noise is the major source of external noise in aero-engine combustion. Entropy noise is generated in the outlet nozzles of combustors. Low-frequency ... -
A Technoeconomic Analysis of Different Options for Cogenerating Power in Hydrogen Plants Based on Natural Gas Reforming
(The American Society of Mechanical Engineers (ASME), 2007)Steam methane reforming is the most common process for producing hydrogen in the world. It currently represents the most efficient and mature technology for this purpose. However, because of ... -
LES and RANS Investigations Into Buoyancy-Affected Convection in a Rotating Cavity With a Central Axial Throughflow
(The American Society of Mechanical Engineers (ASME), 2007)The buoyancy-affected flow in rotating disk cavities, such as occurs in compressor disk stacks, is known to be complex and difficult to predict. In the present work, large eddy simulation (LES) ... -
Multifunctional Energy System (MES) With Multifossil Fuels and Multiproducts
(The American Society of Mechanical Engineers (ASME), 2007)A new kind of multifunctional energy system (MES) with multifossil fuels and multiproducts is proposed in this paper. This new system consumes coal and natural gas as fuel simultaneously, and ... -
Effect of Vortex Flow on Heat Transfer to Combustion Chamber Wall
(The American Society of Mechanical Engineers (ASME), 2007)A new experimental facility was designed, fabricated, and tested to model and study the effect of bidirectional swirl flow on the rate of heat transfer to combustion chamber walls. Reduction ... -
An Improved Soot Formation Model for 3D Diesel Engine Simulations
(The American Society of Mechanical Engineers (ASME), 2007)Soot formation phenomenon is far from being fully understood today and models available for simulation of soot in practical combustion devices remain of relatively limited success, despite ... -
Experimental and Computational Studies on Gasoline HCCI Combustion Control Using Injection Strategies
(The American Society of Mechanical Engineers (ASME), 2007)Homogeneous Charge Compression Ignition (HCCI) has challenges of ignition control. In this paper, HCCI ignition timing and combustion rate were controlled by two-stage direct injection (TSDI) ... -
Dynamic Properties of Tilting-Pad Journal Bearings: Experimental and Theoretical Investigation of Frequency Effects due to Pivot Flexibility
(The American Society of Mechanical Engineers (ASME), 2007)Tilting-pad journal bearings (TPJBs) dominate as rotor supports in high-speed rotating machinery. The paper analyzes frequency effects on the TPJB’s stiffness and damping characteristics based on ... -
Rayleigh-Bénard Convection in Open and Closed Rotating Cavities
(The American Society of Mechanical Engineers (ASME), 2007)Buoyancy effects can be significant in the rotating annular cavities found between compressor discs in gas-turbine engines, where Rayleigh numbers above 1012 are common. In some engines, the ... -
Identification of Force Coefficients in a Squeeze Film Damper With a Mechanical End Seal—Part I: Unidirectional Load Tests
(The American Society of Mechanical Engineers (ASME), 2007)Squeeze film dampers (SFDs) with low levels of external pressurization and poor end sealing are prone to air entrapment, thus not generating enough damping capability. Single frequency, unidirectional ... -
Reduced-Order Modeling and Wavelet Analysis of Turbofan Engine Structural Response due to Foreign Object Damage (FOD) Events
(The American Society of Mechanical Engineers (ASME), 2007)The development of a wavelet-based feature extraction technique specifically targeting FOD-event induced vibration signal changes in gas turbine engines is described. The technique performs wavelet ... -
Vibration Characteristics of a 75kW Turbo Machine With Air Foil Bearings
(The American Society of Mechanical Engineers (ASME), 2007)Air foil bearings are very attractive bearing systems for turbomachinery because they have several advantages over conventional bearings in terms of oil-free environment, low power loss, long ... -
Creep Strength and Microstructure of AL20-25+Nb Alloy Sheets and Foils for Advanced Microturbine Recuperators
(The American Society of Mechanical Engineers (ASME), 2007)The Oak Ridge National Laboratory (ORNL) and ATI Allegheny Ludlum worked together on a collaborative program for about two years to produce a wide range of commercial sheets and foils of the ... -
Confidence Interval Simulation for Systems of Random Variables
(The American Society of Mechanical Engineers (ASME), 2007)Bayesian network models are seen as important tools in probabilistic design assessment for complex systems. Such network models for system reliability analysis provide a single probability of ... -
Convergent Zone-Refinement Method for Risk Assessment of Gas Turbine Disks Subject to Low-Frequency Metallurgical Defects
(The American Society of Mechanical Engineers (ASME), 2007)Titanium gas turbine disks are subject to a rare but not insignificant probability of fracture due to metallurgical defects, particularly hard α. A probabilistic methodology has been developed ...