Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 5141-5160 of 9564
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Nonlinear Rotordynamics of Automotive Turbochargers: Predictions and Comparisons to Test Data
(The American Society of Mechanical Engineers (ASME), 2007)Passenger vehicle turbochargers (TCs) offer increased engine power and efficiency in an ever-competitive marketplace. Turbochargers operate at high rotational speeds and use engine oil to lubricate ... -
Transient Rotor/Active Magnetic Bearing Control Using Sampled Wavelet Coefficients
(The American Society of Mechanical Engineers (ASME), 2007)A novel method for transient rotor/active magnetic bearing control using sampled wavelet coefficients is proposed. Control currents are formulated in the wavelet transform domain, prior to signal ... -
Experimental Investigation of Mode Shape Sensitivity of an Oscillating Low-Pressure Turbine Cascade at Design and Off-Design Conditions
(The American Society of Mechanical Engineers (ASME), 2007)The effect of negative incidence operation on mode shape sensitivity of an oscillating low-pressure turbine rotor blade row has been studied experimentally. An annular sector cascade has been ... -
Dynamic Behavior of Spherical Friction Dampers and Its Implication to Damper Contact Stiffness
(The American Society of Mechanical Engineers (ASME), 2007)A model that predicts the quasi-static behavior of a friction damper that has spherical contacts was developed using Mindlin’s theory. The model was integrated into a dynamic analysis that ... -
Experimental Contribution to High-Precision Characterization of Magnetic Forces in Active Magnetic Bearings
(The American Society of Mechanical Engineers (ASME), 2007)Parameter identification procedures and model validation are major steps toward intelligent machines supported by active magnetic bearings (AMB). The ability of measuring the electromagnetic bearing ... -
Test Results and Analytical Predictions for Rotor Drop Testing of an Active Magnetic Bearing Expander/Generator
(The American Society of Mechanical Engineers (ASME), 2007)A cryogenic gas expander system that incorporates a high-performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000rpm ... -
Structural Stiffness, Dry Friction Coefficient, and Equivalent Viscous Damping in a Bump-Type Foil Gas Bearing
(The American Society of Mechanical Engineers (ASME), 2007)High performance oil-free turbomachinery implements gas foil bearings (FBs) to improve mechanical efficiency in compact units. FB design, however, is still largely empirical due to its mechanical ... -
Comparative Performance Analysis of Internal and External Reforming of Methanol in SOFC-MGT Hybrid Power Plants
(The American Society of Mechanical Engineers (ASME), 2007)SOFC-MGT hybrid power plants are a very attractive near term option, as they achieve efficiencies of over 60% even for small power outputs (200–400kW). The SOFC hybrid systems currently developed ... -
Lifetime Prediction of Components Including Initiation Phase
(The American Society of Mechanical Engineers (ASME), 2007)The lifetime distribution of a component subjected to fatigue loading is calculated using a micromechanics model for crack initiation and a fracture mechanics model for crack growth. These models ... -
Key Parameters for the Performance of Impaction-Pin Nozzles Used in Inlet Fogging of Gas Turbine Engines
(The American Society of Mechanical Engineers (ASME), 2007)The application of inlet air fogging to gas turbine engines for power augmentation has become common practice, with more than 1000 installations worldwide, including a large number of advanced ... -
Application of Hot-Wire Anemometry in a Blow-Down Turbine Facility
(The American Society of Mechanical Engineers (ASME), 2007)In order to test HP turbine stages under engine representative conditions on a heat transfer point of view, blow-down test rigs are often used. In these rigs the evolution of gas temperature, ... -
Design and Off-Design Characteristics of the Alternative Recuperated Gas Turbine Cycle With Divided Turbine Expansion
(The American Society of Mechanical Engineers (ASME), 2007)In order to fully address the characteristics of the alternative recuperated cycle with divided turbine expansion, both design and off-design analyses have been performed. Two types of mechanical ... -
Gas Turbine Fogging Technology: A State-of-the-Art Review—Part II: Overspray Fogging—Analytical and Experimental Aspects
(The American Society of Mechanical Engineers (ASME), 2007)The strong influence of ambient temperature on the output and heat rate on a gas turbine has popularized the application of inlet fogging and overspray for power augmentation. One of the main ... -
Gas Turbine Fogging Technology: A State-of-the-Art Review—Part I: Inlet Evaporative Fogging—Analytical and Experimental Aspects
(The American Society of Mechanical Engineers (ASME), 2007)Ambient temperature strongly influences gas turbine power output causing a reduction of around 0.50% to 0.90% for every 1°C of temperature rise. There is also a significant increase in the ... -
Gas Turbine Fogging Technology: A State-of-the-Art Review—Part III: Practical Considerations and Operational Experience
(The American Society of Mechanical Engineers (ASME), 2007)The strong influence of ambient temperature on the output and heat rate of a gas turbine has popularized the application of inlet fogging and overspray for power augmentation. In this paper ... -
Particle Image Velocimetry Measurements of the Three-Dimensional Flow in an Exhaust Hood Model of a Low-Pressure Steam Turbine
(The American Society of Mechanical Engineers (ASME), 2007)The three-dimensional flow structure inside an exhaust hood model of a low-pressure steam turbine was investigated using a particle image velocimetry (PIV) velocity field measurement technique. ... -
Genetic Algorithm Optimization for Primary Surfaces Recuperator of Microturbine
(The American Society of Mechanical Engineers (ASME), 2007)In recent years, the genetic algorithm (GA) technique has gotten much attention in solving real-world problems. This technique has a strong ability for global searching and optimization based ... -
Kinetics of Jet Fuel Combustion Over Extended Conditions: Experimental and Modeling
(The American Society of Mechanical Engineers (ASME), 2007)The oxidation of kerosene (Jet-A1) has been studied experimentally in a jet-stirred reactor at 1 to 40atm and constant residence time, over the high temperature range 800–1300K, and for variable ... -
Numerical Simulations of Isothermal Flow in a Swirl Burner
(The American Society of Mechanical Engineers (ASME), 2007)In this paper, the non-reacting flow in a swirl burner is studied using large eddy simulation. The configuration consists of two unconfined coannular jets at a Reynolds number of 81,500. The ... -
Automatic Optimization of Preswirl Nozzle Design
(The American Society of Mechanical Engineers (ASME), 2007)The objective of the research described here is to develop and demonstrate use of automatic design methods for preswirl nozzles. Performance of preswirled cooling air delivery systems depends ...