Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 5081-5100 of 9564
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Development and Application of a Complete Multijet Common-Rail Injection-System Mathematical Model for Hydrodynamic Analysis and Diagnostics
(The American Society of Mechanical Engineers (ASME), 2008)A rather complete mathematical model for a common-rail injection-system dynamics numerical simulation was developed to support experimentation, layout, and control design, as well as performance ... -
Experimental Analysis of Air∕Oil Separator Performance
(The American Society of Mechanical Engineers (ASME), 2008)Within the European research project (Advanced Transmission and Oil System Concepts), a systematic study of the separation efficiency of a typical aeroengine air∕oil separator design was conducted. ... -
Prediction of Combustion Parameters, Performance, and Emissions in Compressed Natural Gas and Gasoline SI Engines
(The American Society of Mechanical Engineers (ASME), 2008)The simulation of heat release, flame propagation speeds, and pollutant formation was carried out in both a turbocharged compressed natural gas (CNG) engine and a multivalve naturally aspirated ... -
Nonlinear Versus Linear Stress-Strain Relations in Engine Turbulence Modeling Under Swirl and Squish Flow Conditions
(The American Society of Mechanical Engineers (ASME), 2008)A general form of the stress-strain constitutive relation was introduced for the application of two nonlinear k-ε turbulence models, namely, the algebraic Reynolds stress model of and (1993, “ ... -
Analysis of the Interactions Between Indicated and Reciprocating Torques for the Development of a Torsional Behavior Model of the Powertrain
(The American Society of Mechanical Engineers (ASME), 2008)Torque-based engine control systems usually employ a produced torque estimation feedback in order to verify that the strategy target torque has been met. Torque estimation can be performed using ... -
Hybrid Gas Bearings With Controlled Supply Pressure to Eliminate Rotor Vibrations While Crossing System Critical Speeds
(The American Society of Mechanical Engineers (ASME), 2008)Microturbomachinery implements gas bearings in compact units of enhanced mechanical reliability. Gas bearings, however, have little damping and wear quickly during transient rub events. Flexure ... -
An Energy-Based Uniaxial Fatigue Life Prediction Method for Commonly Used Gas Turbine Engine Materials
(The American Society of Mechanical Engineers (ASME), 2008)A new energy-based life prediction framework for calculation of axial and bending fatigue results at various stress ratios has been developed. The purpose of the life prediction framework is ... -
Controlling Backfire for a Hydrogen-Fueled Engine Using External Mixture Injection
(The American Society of Mechanical Engineers (ASME), 2008)The development of a hydrogen-fueled engine using external mixture injection (e.g., using port or manifold fuel injection) with high efficiency and high power is dependent on the control of ... -
Spark-Ignition and Combustion Characteristics of High-Pressure Hydrogen and Natural-Gas Intermittent Jets
(The American Society of Mechanical Engineers (ASME), 2008)Recently, an in-cylinder injection method has been considered for the improvement of thermal efficiency in natural-gas and hydrogen spark-ignition (SI) engines. However, the SI and combustion ... -
Biaxial Thermomechanical-Fatigue Life Property of a Directionally Solidified Ni-Base Superalloy
(The American Society of Mechanical Engineers (ASME), 2008)High-temperature components in thermal power plants are subjected to creep-fatigue loading where creep cavities initiate and grow on grain boundaries. Development of life assessment methods of ... -
Pressure-Scaling of Pressure-Swirl Atomizer Cone Angles
(The American Society of Mechanical Engineers (ASME), 2008)An experimental investigation was conducted to study the effects of increased ambient pressure (up to 6.89MPa) and increased nozzle pressure drop (up to 2.8MPa) on the cone angles for sprays ... -
A Real-World Application of Fuzzy Logic and Influence Coefficients for Gas Turbine Performance Diagnostics
(The American Society of Mechanical Engineers (ASME), 2008)This paper presents an example of the use of fuzzy logic combined with influence coefficients applied to engine test-cell data to diagnose gas-path related performance faults. The approach ... -
Influence of Force Field Direction on Pressure Sensors Calibrated at Up to 12,000 g
(The American Society of Mechanical Engineers (ASME), 2008)The measurement of pressure within both stationary and rotating frames of reference is a fundamental requirement when studying the flow field through turbomachinery blading. Measurement of pressure ... -
Parametric Studies on Dynamic Performance of Hybrid Airfoil Bearing
(The American Society of Mechanical Engineers (ASME), 2008)Airfoil bearings offer many advantages over oil-lubricated bearings, but they have reliability issues during start∕stops (wear) and limited heat dissipation capability. To address these issues, a ... -
Laminar Flame Speeds and Strain Sensitivities of Mixtures of H2∕O2∕N2 at Elevated Preheat Temperatures
(The American Society of Mechanical Engineers (ASME), 2008)Laminar flame speeds and strain sensitivities of mixtures of H2 and air or air highly diluted with N2 (O2:N2 1:9) have been measured for a range of equivalence ratios at high preheat conditions ... -
A Case Study for a Turbogenerator Accident Using Multiscale Association
(The American Society of Mechanical Engineers (ASME), 2008)This paper presents a novel method of multiscale association for analyzing a turbogenerator accident having strange behaviors and serious consequence. Wave index (WI) and credibility of sensor ... -
Optical Nondestructive Condition Monitoring of Thermal Barrier Coatings
(The American Society of Mechanical Engineers (ASME), 2008)This paper describes recent developments of the thermal barrier sensor concept for nondestructive evaluation (NDE) of thermal barrier coatings (TBCs) and online condition monitoring in gas turbines. ... -
Improving the Performance of a Bent Ejector With Inlet Swirl
(The American Society of Mechanical Engineers (ASME), 2008)Ejectors are commonly employed in gas turbine exhaust systems for reasons such as space ventilation and IR suppression. Ejectors may incorporate bends in the geometry for various reasons. Studies ... -
Sensitivity Analysis of NOx Formation Kinetics in Pilot-Ignited Natural Gas Engines
(The American Society of Mechanical Engineers (ASME), 2007)A sensitivity analysis of NOx formation in pilot-ignited natural gas dual fuel engines is performed based on a phenomenological combustion model. The NOx formation mechanism employed in this ... -
An Experimental Investigation on the Effect of Post-Injection Strategies on Combustion and Emissions in the Low-Temperature Diesel Combustion Regime
(The American Society of Mechanical Engineers (ASME), 2007)In order to meet future emissions regulations, new combustion concepts are being developed. Among them, the development of low-temperature diesel combustion systems has received considerable ...