Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2301-2320 of 9564
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Numerical Characterization of Flow and Heat Transfer in Preswirl Systems
(The American Society of Mechanical Engineers (ASME), 2018)This paper deals with a numerical study aimed at the validation of a computational procedure for the aerothermal characterization of preswirl systems employed in axial gas turbines. The numerical campaign focused on an ... -
Lean-Premixed, Swirl-Stabilized Flame Response: Flame Structure and Response as a Function of Confinement
(The American Society of Mechanical Engineers (ASME), 2018)The effect of confinement (flame–wall interactions) on the response of a turbulent, swirl-stabilized flame is experimentally examined, with a focus on the shape and structure of these flames. A series of three cylindrical ... -
Analysis of the Thermodynamic Potential of Supercritical Carbon Dioxide Cycles: A Systematic Approach
(The American Society of Mechanical Engineers (ASME), 2018)After the renewed interest in supercritical carbon dioxide cycles, a large number of cycle layouts have been proposed in literature. These works, which are essentially theoretical, consider different operating conditions ... -
Investigation of Air Injection and Cavity Size Within a Circumferential Combustor to Increase G-Load and Residence Time
(The American Society of Mechanical Engineers (ASME), 2018)A gas turbine combustion process subjected to high levels of centrifugal acceleration has demonstrated the potential for increased flame speeds and shorter residence times. Ultracompact combustors (UCC) invoke the high-g ... -
Numerical Study of Cage Dynamics Focused on Hydrodynamic Effects of Guidance Land Clearances for Different Ball-Pocket Clearances in Cryogenic Environments
(The American Society of Mechanical Engineers (ASME), 2018)This study presents the dynamic motion of a ball bearing cage submerged in a cryogenic fluid under high-speed conditions. The dynamic motion of the cage has been studied as a function of the race land-cage and ball-cage ... -
Effects of Purge Flow Configuration on Sealing Effectiveness in a Rotor–Stator Cavity
(The American Society of Mechanical Engineers (ASME), 2018)Secondary air is bled from the compressor in a gas turbine engine to cool turbine components and seal the cavities between stages. Unsealed cavities can lead to hot gas ingestion, which can degrade critical components or, ... -
Comparison of Piston Concept Design Solutions for Composite Cycle Engines—Part I: Similarity Considerations
(The American Society of Mechanical Engineers (ASME), 2018)Composite cycle engines comprising piston engines (PEs) as well as piston compressors (PCs) to achieve hecto pressure ratios represent a target area of current research surpassing gas turbine efficiency. An unclear broad ... -
Performance of Adaptive Lubricants in a Hybrid Journal Bearing Operating Under Fully Saturated Conditions
(The American Society of Mechanical Engineers (ASME), 2018)Adaptive lubricants involve binary mixture of synthetic oil and dissolved carbon dioxide (CO2). Unlike conventional lubricant oils, the lubricant viscosity not only varies with the temperature within the bearing but also ... -
Mechanisms for Residence Volume Reduction in Shallow Sump
(The American Society of Mechanical Engineers (ASME), 2018)Gas turbine aero-engines employ fast rotating shafts that are supported by bearings at several axial locations along the engine. Due to extreme load and heat, oil is injected to the bearings to aid lubrication and cooling. ... -
Wave Rotor Design Method With Three Steps Including Experimental Validation
(The American Society of Mechanical Engineers (ASME), 2018)This paper adapted and extended the preliminary two-step wave rotor design method with another step of experimental validation so that it became a self-validating wave rotor design method with three steps. First, the ... -
Thermodynamic Considerations Related to Knock: Results From an Engine Cycle Simulation
(The American Society of Mechanical Engineers (ASME), 2018)The design and development of high efficiency spark-ignition engines continues to be limited by the consideration of knock. Although the topic of spark knock has been the subject of comprehensive research since the early ... -
Numerical Testing of a Trailing Edge Passive Morphing Control for Large Axial Fan Blades
(The American Society of Mechanical Engineers (ASME), 2018)The concept of morphing geometry to control and stabilize the flow has been proposed and applied in several aeronautic and wind turbine applications. We studied the effect of a similar passive system applied on an axial ... -
Hybrid-Electric Turbocharger and High-Speed SiC Variable-Frequency Drive Using Sensorless Control Algorithm
(The American Society of Mechanical Engineers (ASME), 2018)Electrically assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events ... -
Interface Reduction in Craig–Bampton Component Mode Synthesis by Orthogonal Polynomial Series
(The American Society of Mechanical Engineers (ASME), 2018)The component mode synthesis (CMS) based on the Craig–Bampton (CB) method has two strong limitations that appear when the number of the interface degrees-of-freedom (DOFs) is large. First, the reduced-order model (ROM) ... -
Fan Similarity Model for the Fan–Intake Interaction Problem
(The American Society of Mechanical Engineers (ASME), 2018)Very high bypass ratio turbofans with large fan tip diameter are an effective way of improving the propulsive efficiency of civil aero-engines. Such engines, however, require larger and heavier nacelles, which partially ... -
On the Thermodynamic Process in the Bulk-Flow Model for the Estimation of the Dynamic Coefficients of Labyrinth Seals
(The American Society of Mechanical Engineers (ASME), 2018)The impact of sealing equipment on the stability of turbomachineries is a crucial topic because the power generation market is continuously requiring high rotational speed and high performance, leading to the clearance ... -
Gas Turbine Combined Cycle Optimized for Postcombustion Carbon Capture
(The American Society of Mechanical Engineers (ASME), 2018)This paper describes a gas turbine combined cycle (GTCC) power plant system, which addresses the three key design challenges of postcombustion CO2 capture from the stack gas of a GTCC power plant using aqueous amine-based ... -
Beyond Brayton Cycle: It is Time to Change the Paradigm
(The American Society of Mechanical Engineers (ASME), 2018)A detailed look at the gas turbine (GT) technology over the last three decades clearly shows that an asymptotic limit is reached in thermal efficiency in combined cycle (CC) configuration. There is little reason to expect ... -
Analysis of Water–Fuel Ratio Variation in a Gas Turbine With a Wet-Compressor System by Change in Fuel Composition
(The American Society of Mechanical Engineers (ASME), 2018)The wet compressor (WC) has become a reliable way to reduce gas emissions and increase gas turbine efficiency. However, fuel source diversification in the short and medium terms presents a challenge for gas turbine operators ... -
On the Design, Manufacture, and Premature Failure of a Metal Mesh Foil Thrust Bearing—How Concepts That Work on Paper, Actually Do Not
(The American Society of Mechanical Engineers (ASME), 2018)Oil-free microturbomachinery (OFT) implements compliant foil bearings because of their minute drag and ability to operate in extreme (high or low) temperature. Prominent to date, bump-foil thrust bearings integrate an ...