Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2041-2060 of 9564
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Some Recent Advances in Engineering Fracture Modeling for Turbomachinery
(The American Society of Mechanical Engineers (ASME), 2019)Recent advances in practical engineering methods for fracture analysis of turbomachinery components are described. A comprehensive set of weight function (WF) stress intensity factor (SIF) solutions for elliptical and ... -
An Investigation on the Loss Generation Mechanisms Inside Different Centrifugal Compressor Volutes for Turbochargers
(The American Society of Mechanical Engineers (ASME), 2019)In centrifugal compressor design, the volute plays a key role in defining the overall efficiency and operating range of the stage. The flow at the impeller outlet is indeed characterized by a high kinetic energy content, ... -
Development of a Criterion for a Robust Identification of Diffuser Rotating Stall Onset in Industrial Centrifugal Compressors
(The American Society of Mechanical Engineers (ASME), 2019)Recent studies showed that a prompt detection of the stall inception, connected with a specific model to predict its associated aerodynamic force, could provide room for an extension of the left margin of the operating ... -
Effects of Nonlinear Modal Interactions on the Thermoacoustic Stability of Annular Combustors
(The American Society of Mechanical Engineers (ASME), 2019)In this theoretical and numerical analysis, a low-order network model is used to investigate a thermoacoustic system with discrete rotational symmetry. Its geometry resembles that of the MICCA combustor (Laboratoire EM2C, ... -
Active Subspace Development of Integrally Bladed Disk Dynamic Properties Due to Manufacturing Variations
(The American Society of Mechanical Engineers (ASME), 2019)The impact of geometry variations on integrally bladed disk eigenvalues is investigated. A large population of industrial bladed disks (blisks) are scanned via a structured light optical scanner to provide as-measured ... -
Development of a New High-Strength Steel for Low Pressure Steam Turbine End-Stage Blades
(The American Society of Mechanical Engineers (ASME), 2019)Influenced by the growing share of Renewable Energies, higher flexibility and increased efficiency of fossil power plants as well as improved cost efficiency in production of turbine components are evident market trends. ... -
Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine
(The American Society of Mechanical Engineers (ASME), 2018)In-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during ... -
Acoustic Diagnostics Applications in the Study of the Oscillation Combustion in Lean Premixed Pre-Evaporation Combustor
(The American Society of Mechanical Engineers (ASME), 2018)The paper presents an experimental investigation of the thermoacoustic oscillations detection in a lean premixed pre-evaporation (LPP) combustor using acoustic signals. The LPP model combustion chamber oscillation combustion ... -
Effects of Exhaust Gas Recirculation Constituents on Methyl Decanoate Auto-Ignition: A Kinetic Study
(The American Society of Mechanical Engineers (ASME), 2018)Biodiesel engines are found to have improved soot, hydrocarbon (HC), and carbon monoxide (CO) emissions, with modestly increased nitrogen oxides (NOx) emissions. Exhaust gas recirculation (EGR) could be used for the NOx ... -
Effects of Wall Heat Loss on Swirl-Stabilized Nonpremixed Flames With Localized Extinction
(The American Society of Mechanical Engineers (ASME), 2018)Large eddy simulation (LES) with three-dimensional conditional moment closure (CMC) subgrid model for combustion is applied to simulate a swirl-stabilized nonpremixed methane flame with localized extinction, with special ... -
A Detailed Study of the Effects of Biodiesel Addition and Exhaust Gas Recirculation on Diesel Engine PCCI Combustion, Performance and Emission Characteristics by KIVA–CHEMKIN Coupling
(The American Society of Mechanical Engineers (ASME), 2018)In this study, a numerical study is performed by KIVA–CHEMKIN code to investigate the effects of biodiesel addition and exhaust gas recirculation (EGR) on diesel engine premixed charge compression ignition (PCCI) combustion, ... -
Regenerative Hydraulic Assisted Turbocharger
(The American Society of Mechanical Engineers (ASME), 2018)Engine downsizing and down-speeding are essential in order to meet future U.S. fuel economy (FE) mandates. Turbocharging is one technology to meet these goals. Fuel economy improvements must, however, be achieved without ... -
Identifying Opportunities for Reducing Nacelle Drag
(The American Society of Mechanical Engineers (ASME), 2018)The accurate prediction of drag caused by bluff bodies present in aerospace applications, particularly at high angles of attack, was a challenge. An experimental and numerical investigation of a nacelle intended for ... -
Optimal Architectures for Dry and Wet Gas-Turbine Engines
(The American Society of Mechanical Engineers (ASME), 2018)We systematically determine the maximally efficient manner of using water and air in a single-cycle steady-flow combustion gas turbine power plant. In doing so, we identify the upper limit to exergy efficiency for dry and ... -
Uncertainty Quantification of NOx Emission Due to Operating Conditions and Chemical Kinetic Parameters in a Premixed Burner
(The American Society of Mechanical Engineers (ASME), 2018)Many sources of uncertainty exist when emissions are modeled for a gas turbine combustion system. They originate from uncertain inputs, boundary conditions, calibration, or lack of sufficient fidelity in a model. In this ... -
A Study of Supercritical Carbon Dioxide Power Cycle for Concentrating Solar Power Applications Using an Isothermal Compressor
(The American Society of Mechanical Engineers (ASME), 2018)For the concentrating solar power (CSP) applications, the supercritical carbon dioxide (s-CO2) power cycle is beneficial in many aspects, including high cycle efficiencies, reduced component sizing, and potential for the ... -
Analysis of Forced Response for Bladed Disks Mistuned by Material Anisotropy Orientation Scatters
(The American Society of Mechanical Engineers (ASME), 2018)A new method is developed for the forced response analysis of mistuned bladed disks manufactured from anisotropic materials and mistuned by different orientations of material anisotropy axes. The method uses (i) sector ... -
Rotordynamic Performance of Hybrid Air Foil Bearings With Regulated Hydrostatic Injection
(The American Society of Mechanical Engineers (ASME), 2018)Air foil bearing (AFB) technology has made substantial advancement during the past decades and found its applications in various small turbomachinery. However, rotordynamic instability, friction and drag during the start/stop, ... -
Development of a Flexible Turbine Cooling Prediction Tool for Preliminary Design of Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2018)As the overall pressure ratio (OPR) and turbine inlet temperature (TIT) of modern gas turbines are constantly being increased in the pursuit of increasing efficiency and specific power, the effect of bleed cooling air on ... -
Effect of Circumferential Location of Radial Injection on Rotordynamic Performance of Hybrid Air Foil Bearings
(The American Society of Mechanical Engineers (ASME), 2018)Air foil bearings (AFBs) are introduced as promising bearings for oil-free turbomachinery applications. AFBs provide reliable operation at high speed and high temperature with negligible power loss. Hybrid air foil bearing ...