Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 3301-3320 of 9564
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Simulation of the Ignition Process in an Annular Multiple Injector Combustor and Comparison With Experiments
(The American Society of Mechanical Engineers (ASME), 2015)Ignition is a problem of fundamental interest with critical practical implications. While there are many studies of ignition of single injector configurations, the transient ignition of a full annular combustor has not ... -
A Matching Method for Two Stage Turbocharging System
(The American Society of Mechanical Engineers (ASME), 2015)The turbine system of a twostage turbocharger composed of high pressure turbine (HT), low pressure turbine (LT), and bypass valve decides distribution and utilization of exhaust gas energy and influence performance of ... -
A Hybrid Semi empirical Model for Lean Blow Out Limit Predictions of Aero engine Combustors
(The American Society of Mechanical Engineers (ASME), 2015)According to the Lefebvre's model and flame volume (FV) concept, an FV model about lean blowout (LBO) was proposed by authors in early study. On the other hand, due to the model parameter (FV) contained in FV model is ... -
Redesign of a High Pressure Compressor Blade Accounting for Nonlinear Structural Interactions
(The American Society of Mechanical Engineers (ASME), 2015)Recent numerical developments dedicated to the simulation of rotor/stator interaction involving direct structural contacts have been integrated within the Snecma industrial environment. This paper presents the first attempt ... -
Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations
(The American Society of Mechanical Engineers (ASME), 2015)An experimental and numerical investigation is carried out to evaluate the performance of alternative pumping ring designs for dual mechanical seals. Both radialflow and axialflow pumping rings are considered in the present ... -
Tilting Pad Journal Bearings: On Bridging the Hot Gap Between Experimental Results and Model Predictions
(The American Society of Mechanical Engineers (ASME), 2015)The accurate prediction of the forced performance of tilting pad journal bearings (TPJBs) relies on coupling a fluid film model that includes thermal energy transport, and on occasion fluid inertia, to the structural ... -
Tribological Optimization of Thrust Bearings Operated With Lubricants of Spatially Varying Viscosity
(The American Society of Mechanical Engineers (ASME), 2015)In the present work, a computational optimization study of thrust bearings lubricated with spatially varying viscosity lubricants is presented, with the main goal of minimizing friction coefficient. In practice, spatial ... -
Operational Modal Analysis of Torsional Modes in Rotating Machinery
(The American Society of Mechanical Engineers (ASME), 2015)Traditional experimental modal testing techniques rely on controlled and measured excitation together with measured responses in order to identify the mode shape, natural frequency, and damping factor of each mode. Applying ... -
Comparative Study of Using R 410A, R 407C, R 22, and R 134a as Cooling Medium in the Condenser of a Steam Power Plant
(The American Society of Mechanical Engineers (ASME), 2015)A stepbystep technique has been implemented in the analytical study of heat transfer and pressure gradient characteristics of refrigerants R410A, R407C, R22, and R134a used as cooling media in the condenser of a steam power ... -
Increasing On Shore Wind Generated Electricity in Germany's Transmission Grid
(The American Society of Mechanical Engineers (ASME), 2015)An increase in the penetration of renewables generated electricity has technical and economic impacts on power transmission systems because of the renewables' variable characteristics. However, due to concerns of energy ... -
Robust Optimal Operation of a Gas Turbine Cogeneration Plant Under Uncertain Energy Demands
(The American Society of Mechanical Engineers (ASME), 2015)Some optimal operation methods based on the mixedinteger linear programming (MILP) have been proposed to operate energy supply plants properly from the viewpoints of economics, energy saving, and CO2 emission reduction. ... -
Analysis and Methodology to Characterize Heat Transfer Phenomena in Automotive Turbochargers
(The American Society of Mechanical Engineers (ASME), 2015)In the present work a comprehensive study of turbocharger heat transfer phenomena is discussed, showing their relevance compared to gas enthalpy variations through the turbomachinery. The study provides an experimental ... -
Optimal Transient Control Trajectories in Diesel–Electric Systems—Part II: Generator and Energy Storage Effects
(The American Society of Mechanical Engineers (ASME), 2015)The effects of generator model and energy storage on the optimal control of a diesel–electric powertrain in transient operation are studied. Two different types of problems are solved, minimum fuel and minimum time, with ... -
Comparative Analysis of Chemical Kinetic Models Using the Alternate Species Elimination Approach
(The American Society of Mechanical Engineers (ASME), 2015)A major thrust in combustion research is the development of chemical kinetic models for computational analysis of various combustion processes. Significant deviations can be seen when comparing predictions of these models ... -
Development of Anode Gas Recycle System Using Ejector for 1 kW Solid Oxide Fuel Cell
(The American Society of Mechanical Engineers (ASME), 2015)An anode gas recycle (AGR) system using an ejector for 1 kW solid oxide fuel cells (SOFCs) was developed to increase the electrical efficiency of combined power generation. We call this an AGR–SOFC. The effects of ... -
Optimal Transient Control Trajectories in Diesel–Electric Systems—Part I: Modeling, Problem Formulation, and Engine Properties
(The American Society of Mechanical Engineers (ASME), 2015)A nonlinear four statethree input mean value engine model (MVEM), incorporating the important turbocharger dynamics, is used to study optimal control of a diesel–electric powertrain during transients. The optimization ... -
Dry Cooled Supercritical CO2 Power for Advanced Nuclear Reactors
(The American Society of Mechanical Engineers (ASME), 2015)Currently, waste heat rejection from electrical power systems accounts for the largest fraction of water withdrawals from the U.S. fresh water table. Siting of nuclear power plants is limited to areas with access to a large ... -
Absolute/Convective Instability Transition in a Backward Facing Step Combustor: Fundamental Mechanism and Influence of Density Gradient
(The American Society of Mechanical Engineers (ASME), 2015)Hydrodynamic instabilities of the flow field in lean premixed gas turbine combustors can generate velocity perturbations that wrinkle and distort the flame sheet over length scales that are smaller than the flame length. ... -
A Multidisciplinary Approach for the Comprehensive Assessment of Integrated Rotorcraft–Powerplant Systems at Mission Level
(The American Society of Mechanical Engineers (ASME), 2015)This paper presents an integrated methodology for the comprehensive assessment of combined rotorcraft–powerplant systems at mission level. Analytical evaluation of existing and conceptual designs is carried out in terms ... -
Characterization and Modeling of a Spinning Thermoacoustic Instability in an Annular Combustor Equipped With Multiple Matrix Injectors
(The American Society of Mechanical Engineers (ASME), 2015)Oscillations in fully annular systems coupled by azimuthal modes are often observed in gas turbine combustors but not well documented. One objective of the present study is to characterize this type of oscillation in a ...