Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2581-2600 of 9564
-
Numerical Characterization of Hot-Gas Ingestion Through Turbine Rim Seals
(The American Society of Mechanical Engineers (ASME), 2017)This paper deals with a numerical study aimed at the characterization of hot-gas ingestion through turbine rim seals. The numerical campaign focused on an experimental facility which models ingress through the rim seal ... -
Effects of Impeller Squealer Tip on Centrifugal Compressor Performance
(The American Society of Mechanical Engineers (ASME), 2017)This paper summarizes the main results sorted out from a design of experiment (DoE) based on a validated computational fluid dynamics (CFD). Several tip recessed geometries applied to an unshrouded impeller were considered ... -
Transient “Single-Fuel” RCCI Operation With Customized Pistons in a Light-Duty Multicylinder Engine
(The American Society of Mechanical Engineers (ASME), 2017)Reactivity controlled compression ignition (RCCI) combustion in a light-duty multicylinder engine (MCE) over transient operating conditions using fast response exhaust unburned hydrocarbon (UHC1), nitric oxide (NO), and ... -
Intake Flow Analysis of a Pulsed Detonation Engine
(The American Society of Mechanical Engineers (ASME), 2017)Unsteady flow within the intake system of a hydrogen–air pulse detonation engine (PDE) has been analyzed using a quasi-one-dimensional (Q1D) computational fluid dynamic (CFD) code. The analysis provides insight into the ... -
Unsteady Flow Phenomena in Turbine Rim Seals
(The American Society of Mechanical Engineers (ASME), 2017)While turbine rim sealing flows are an important aspect of turbomachinery design, affecting turbine aerodynamic performance and turbine disk temperatures, the present understanding and predictive capability for such flows ... -
Thermal Modeling of an Intermediate Pressure Steam Turbine by Means of Conjugate Heat Transfer—Simulation and Validation
(The American Society of Mechanical Engineers (ASME), 2017)Today's power market asks for highly efficient turbines which can operate at a maximum flexibility, achieving a high lifetime and all of this on competitive product costs. In order to increase the plant cycle efficiency, ... -
High-Temperature Deformation of Inconel 718PlusTM
(The American Society of Mechanical Engineers (ASME), 2017)Since its introduction in 2003, alloy 718PlusTM spurred a lot of interest owing to its increased maximum service temperature over conventional Inconel 718 (704 °C versus 650 °C), good formability, and weldability together ... -
Experimental Characterization of Rotor Convective Heat Transfer Coefficients in the Vicinity of a Leaf Seal
(The American Society of Mechanical Engineers (ASME), 2017)Leaf seals are filament seals for use at static to rotating interfaces in the engine secondary air system. They offer reduced leakage rates and better off-design performance over conventional labyrinth seals. If compared ... -
Development of a Fast-Response Aerodynamic Pressure Probe Based on a Waveguide Approach
(The American Society of Mechanical Engineers (ASME), 2017)Currently, fast-response aerodynamic probes are widely used for advanced experimental investigations in turbomachinery applications. The most common configuration is a virtual three-hole probe. This solution is a good ... -
Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers
(The American Society of Mechanical Engineers (ASME), 2017)Oil-free bearings for automotive turbochargers (TCs) offer unique advantages eliminating oil-related catastrophic TC failures (oil coking, severe bearing wear/seizure, and significant oil leakage, for example), while ... -
Effects of Purge Jet Momentum on Sealing Effectiveness
(The American Society of Mechanical Engineers (ASME), 2017)Driven by the need for higher cycle efficiencies, overall pressure ratios for gas turbine engines continue to be pushed higher thereby resulting in increasing gas temperatures. Secondary air, bled from the compressor, is ... -
Linearized Euler Equations for the Prediction of Linear High-Frequency Stability in Gas Turbine Combustors
(The American Society of Mechanical Engineers (ASME), 2017)A novel methodology for linear stability analysis of high-frequency thermoacoustic oscillations in gas turbine combustors is presented. The methodology is based on the linearized Euler equations (LEEs), which yield a ... -
Developing Additive Manufacturing Technology for Burner Repair
(The American Society of Mechanical Engineers (ASME), 2017)Low emission combustion is one of the most important requirements for industrial gas turbines. Siemens industrial gas turbines SGT-800 and SGT-700 use dry low emission (DLE) technology and are equipped with third generation ... -
Noise-Induced Dynamics in the Subthreshold Region in Thermoacoustic Systems
(The American Society of Mechanical Engineers (ASME), 2017)This article is a report of experiments conducted in order to investigate the role of noise on thermoacoustic systems. In contrast to most studies in this direction, in the present work, the role of noise in the subthreshold ... -
Parallelized, Automated, and Predictive Imprint Cooling Model for Combustion Systems
(The American Society of Mechanical Engineers (ASME), 2017)A novel parallelized, automated, and predictive imprint cooling model (PAPRICO) was developed for modeling of combustor liners using Reynolds-averaged Navier–Stokes (RANS). The methodology involves removing the film and ... -
Development and Test of Oxide/Oxide Ceramic Matrix Composites Combustor Liner Demonstrators for Aero-engines
(The American Society of Mechanical Engineers (ASME), 2017)Ceramic matrix composites (CMC) offer the potential of increased service temperatures and are thus an interesting alternative to conventional combustor alloys. Tubular combustor liner demonstrators made of an oxide/oxide ... -
Liquid Fuel Composition Effects on Forced, Nonpremixed Ignition
(The American Society of Mechanical Engineers (ASME), 2017)The effects of jet fuel composition on ignition probability have been studied in a flowfield that is relevant to turbine engine combustors, but also fundamental and conducive to modeling. In the experiments, a spark kernel ... -
The Effect of Rotor Casing on Low-Pressure Steam Turbine and Diffuser Interactions
(The American Society of Mechanical Engineers (ASME), 2017)The present study aims to investigate the interaction between a last-stage steam turbine blade row and diffuser. This work is carried out using computational fluid dynamics (CFD) simulations of a generic last-stage ... -
Large-Eddy Simulation of Soot Formation in a Model Gas Turbine Combustor
(The American Society of Mechanical Engineers (ASME), 2017)The computational modeling of soot in aircraft engines is a formidable challenge, not only due to the multiscale interactions with the turbulent combustion process but the equally complex physical and chemical processes ... -
Large-Eddy Simulation of a Reacting Jet in Cross Flow With NOx Prediction
(The American Society of Mechanical Engineers (ASME), 2017)The reduction of full and part load emissions and the increase of the turndown ratio are important goals for gas turbine combustor development. Combustion techniques, which generate lower NOx emissions than unstaged premixed ...