Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2221-2240 of 9564
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Rotordynamics Performance of Hybrid Foil Bearing Under Forced Vibration Input
(The American Society of Mechanical Engineers (ASME), 2018)Foil bearings (FB) are one type of hydrodynamic air/gas bearings but with a compliant bearing surface supported by structural material that provides stiffness and damping to the bearing. The hybrid foil bearing (HFB) in ... -
Aerodynamic Optimization of the High Pressure Turbine and Interstage Duct in a Two-Stage Air System for a Heavy-Duty Diesel Engine
(The American Society of Mechanical Engineers (ASME), 2018)Turbochargers reduce fuel consumption and CO2 emissions from heavy-duty internal combustion engines by enabling downsizing and downspeeding through greater power density. This requires greater pressure ratios and thus air ... -
Surface Roughness Impact on Low-Pressure Turbine Performance Due to Operational Deterioration
(The American Society of Mechanical Engineers (ASME), 2018)The overall efficiency and operational behavior of aircraft engines are influenced by the surface finish of the airfoils. During operation, the surface roughness significantly increases due to erosion and deposition ... -
Numerical Analysis on the Impact of Interstage Flow Addition in a High-Pressure Steam Turbine
(The American Society of Mechanical Engineers (ASME), 2018)This study analyzes the fluid dynamic characteristics of an ultrasupercritical (USC) high-pressure turbine with additional steam supplied through an overload valve between the second and third stages. The mixing between ... -
Experimental Study of Ion Current Signals and Characteristics in an Internal Combustion Rankine Cycle Engine Based on Water Injection
(The American Society of Mechanical Engineers (ASME), 2018)The internal combustion Rankine cycle (ICRC) engine utilizes pure oxygen as the oxidant instead of air during combustion to prevent the generation of nitrogen oxide emissions and lower the cost of CO2 recovery. To control ... -
Dynamic and Thermal Analysis of Rotor Drop on Sleeve Type Catcher Bearings in Magnetic Bearing Systems
(The American Society of Mechanical Engineers (ASME), 2018)The catcher bearing (CB) is a crucial part of the magnetic bearing system. It can support the rotor when the magnetic bearing is shut down or malfunctioning and limit the rotor's position when large vibration occurs. The ... -
Stability and Sensitivity Analysis of Hydrodynamic Instabilities in Industrial Swirled Injection Systems
(The American Society of Mechanical Engineers (ASME), 2018)The hydrodynamic instability in an industrial, two-staged, counter-rotative, swirled injector of highly complex geometry is under investigation. Large eddy simulations (LES) show that the complicated and strongly nonparallel ... -
Seizure Improved Lead-Free Electroplated Bearing Overlay System for Heavy-Duty Truck and Off-Highway Applications
(The American Society of Mechanical Engineers (ASME), 2018)The move to lead-free bearing materials is well known, and upcoming legislation, such as the restriction of hazardous substances, is increasing the drive to extend this trend toward heavy-duty diesel truck and off-highway ... -
Probabilistic Fracture Mechanics for Heavy-Duty Gas Turbine Rotor Forgings
(The American Society of Mechanical Engineers (ASME), 2018)We developed and successfully applied a direct simulation Monte Carlo (MC) scheme to quantify the risk of fracture for heavy-duty rotors commonly used in the energy sector. The developed probabilistic fracture mechanics ... -
Stabilization Mechanisms of Swirling Premixed Flames With an Axial-Plus-Tangential Swirler
(The American Society of Mechanical Engineers (ASME), 2018)The stabilization of premixed flames within a swirling flow produced by an axial-plus-tangential swirler is investigated in an atmospheric test rig. In this system, flames are stabilized aerodynamically away from the solid ... -
Effect of Quarls on the Blowout Stability and Emission of Pollutants of a Liquid-Fueled Swirl Burner
(The American Society of Mechanical Engineers (ASME), 2018)Stringent emissions standards for NOx and carbon monoxide (CO) prompt lean combustor development. With this motivation, combustion stability issues emerge since the desired operating point approaches the lean blowout limit. ... -
Influence of Fouling on Compressor Dynamics: Experimental and Modeling Approach
(The American Society of Mechanical Engineers (ASME), 2018)The effect of compressor fouling on the performance of a gas turbine has been the subject of several papers; however, the goal of this paper is to address a more fundamental question of the effect of fouling, which is the ... -
Experimental and Theoretical Rotordynamic Coefficients of Smooth and Round-Hole Pattern Water-Fed Annular Seals
(The American Society of Mechanical Engineers (ASME), 2018)This work presents the comparison between experimental and theoretical results obtained for three straight annular seals. One of the annular seals has smooth rotor and stator while the others have a textured stator; the ... -
Characteristics of Volcanic Ash in a Gas Turbine Combustor and Nozzle Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2018)To understand the physics of volcanic ash impact on gas turbine hot-components and develop much-needed tools for engine design and fleet management, the behaviors of volcanic ash in a gas turbine combustor and nozzle guide ... -
Modeling Approach for a Hydrolysis Reactor for the Ammonia Production in Maritime Selective Catalytic Reduction Applications
(The American Society of Mechanical Engineers (ASME), 2018)The catalytic generation of ammonia from a liquid urea solution is a critical process determining the performance of selective catalytic reduction (SCR) systems. Solid deposits on the catalyst surface from the decomposition ... -
On Scaling Method to Investigate High-Speed Over-Tip-Leakage Flow at Low-Speed Condition
(The American Society of Mechanical Engineers (ASME), 2018)Modern high-pressure turbine blades operate at high-speed conditions. The over-tip-leakage (OTL) flow can be high-subsonic or even transonic. From the consideration of problem simplification and cost reduction, the OTL ... -
Large Eddy Simulation of a Pressurized, Partially Premixed Swirling Flame With Finite-Rate Chemistry
(The American Society of Mechanical Engineers (ASME), 2018)Finite-rate chemical effects at gas turbine conditions lead to incomplete combustion and well-known emissions issues. Although a thin flame front is preserved on an average, the instantaneous flame location can vary in ... -
Simulation of Coarse Droplet and Liquid Column Formed around Nozzle Outlets Due to Valve Wobble of a Gasoline Direct Injection Injector
(The American Society of Mechanical Engineers (ASME), 2018)The generation of particulate matter (PM) is one problem with gasoline direct-injection engines. PM is generated in high-density regions of fuel. Uniform air/fuel mixtures and short fuel-spray durations with multiple ... -
Extraction of Linear Growth and Damping Rates of High-Frequency Thermoacoustic Oscillations From Time Domain Data
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents a set of methodologies for the extraction of linear growth and damping rates associated with transversal eigenmodes at screech level frequencies in thermoacoustically noncompact gas turbine combustion ... -
Development of a Simulation Model of Transient Operation of Micro-Combined Heat and Power Systems in a Microgrid
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents the development of a simulation tool for modeling the transient behavior of micro-CHP (combined heat and power) systems, equipped with both thermal and electric storage units and connected with both ...