Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1521-1540 of 9564
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Modeling Complex Contact Conditions and Their Effect on Blade Dynamics
(The American Society of Mechanical Engineers (ASME), 2020)Dry friction devices such as underplatform dampers are commonly included in turbine bladed disks designs to mitigate structural vibrations and avoid high cycle fatigue failures. The design of frictionally damped bladed ... -
Effects of Turbocharger Rotation Inertia on Instantaneous Turbine Efficiency in a Turbocharged-Gasoline Direct Injection (T-GDI) Engine
(The American Society of Mechanical Engineers (ASME), 2020)The effects of turbocharger rotation inertia on instantaneous turbine efficiency were analyzed in a 2.0 L four-cylinder twin-scroll turbocharged gasoline direct injection (T-GDI) engine. Two turbochargers of different ... -
Significance of the Direct Excitation Mechanism for High-Frequency Response of Premixed Flames to Flow Oscillations
(The American Society of Mechanical Engineers (ASME), 2020)Premixed flames are sensitive to flow disturbances, which can arise from acoustic or vortical fluctuations. For transverse instabilities, it is known that a dominant mechanism for flame response is “injector coupling,” ... -
Design Guidelines for Axial Turbines Operating With Non-Ideal Compressible Flows
(The American Society of Mechanical Engineers (ASME), 2020)The impact of non-ideal compressible flows on the fluid-dynamic design of axial turbine stages is examined. First, the classical similarity equation (CSE) is revised and extended to account for the effect of flow non-ideality. ... -
Adjoint-Based Calculation of Parametric Thermoacoustic Maps of an Industrial Combustion Chamber
(The American Society of Mechanical Engineers (ASME), 2020)The aim of this study is to efficiently calculate parametric thermoacoustic maps of typical combustion chambers. Two configurations are considered: an academic configuration based on a Rijke tube, and an industrial combustion ... -
A Friction-Enhanced Tuned Ring Damper for Bladed Disks
(The American Society of Mechanical Engineers (ASME), 2020)This paper introduces a new type of damper for turbomachinery blisks. The major pitfalls of the damper concepts currently employed are two: the low level of relative motion that is available at the damper attachment location, ... -
Design, Analysis, and Manufacture of an Axial Length-Saving Disk-Oriented Engine
(The American Society of Mechanical Engineers (ASME), 2020)A disk-oriented engine was designed to reduce the overall length of a gas turbine engine, combining a single-stage centrifugal compressor and radial in-flow turbine (RIT) in a back-to-back configuration. The focus of this ... -
A Novel Bulk-Flow Model for Pocket Damper Seals
(The American Society of Mechanical Engineers (ASME), 2020)In this paper, a novel bulk-flow model for pocket damper seals (PDS) is introduced. The model is based on two control volumes (CVs) for each circumferential pocket of the seal. The continuity, circumferential momentum, and ... -
Model and Experimental Verification of the Dynamic Forced Performance of a Tightly Sealed Squeeze Film Damper Supplied With a Bubbly Mixture
(The American Society of Mechanical Engineers (ASME), 2020)Practice and experiments with squeeze film dampers (SFDs) sealed with piston rings (PRs) show the lubricant exits through the PR slit, i.e., the gap made by the PR abutted ends when installed, forced as a jet during the ... -
Control Technology Needs for Electrified Aircraft Propulsion Systems
(The American Society of Mechanical Engineers (ASME), 2020)Electrified aircraft propulsion (EAP) systems hold potential for the reduction of aircraft fuel burn, emissions, and noise. Currently, NASA and other organizations are actively working to identify and mature technologies ... -
A Study for Rotordynamic and Leakage Characteristics of a Long-Honeycomb Seal With Two-Phase, Mainly Air Mixtures
(The American Society of Mechanical Engineers (ASME), 2020)This paper investigates the impact of the oil (silicone oil PSF-5cSt) presence in the air on the leakage and rotordynamic characteristics of a long-honeycomb seal with length-to-diameter ratio L/D = 0.748 and diameter ... -
A Study on the Leakage and Rotordynamic Coefficients of a Long-Smooth Seal With Laminar-Two-Phase, Mainly-Oil Mixtures
(The American Society of Mechanical Engineers (ASME), 2020)This paper conducts a comprehensive study on the effects of the presence of air in the oil on the leakage and rotordynamic coefficients of a long-smooth seal (inner diameter D = 89.306 mm, radial clearance Cr = 0.140 mm, ... -
Turbulent Flame Shape Switching at Conditions Relevant for Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2020)A numerical investigation is conducted to shed light on the reasons leading to different flame configurations in gas turbine (GT) combustion chambers of aeronautical interest. Large eddy simulations (LES) with a flamelet-based ... -
Asymptotic Description of Forced Response Vibration Saturation by Friction Forces
(The American Society of Mechanical Engineers (ASME), 2020)The estimation of the final vibration amplitude of a turbomachinery bladed disk is of extreme practical importance; it is an essential information for the prediction of the level of high cycle fatigue of the blades and for ... -
Lagrangian Analysis of Flame Dynamics in the Flow Field of a Bluff Body-Stabilized Combustor
(The American Society of Mechanical Engineers (ASME), 2020)Experiments are performed in a partially premixed bluff body-stabilized turbulent combustor by varying the mean flow velocity. Simultaneous measurements obtained for unsteady pressure, velocity, and heat release rate are ... -
Compressor Stall Warning Using Nonlinear Feature Extraction Algorithms
(The American Society of Mechanical Engineers (ASME), 2020)Stall is a type of flow instability in compressors that sets the low-flow limit for compressor operation. During the past few decades, efforts to develop a reliable stall warning system have had limited success. This paper ... -
Signal Processing Techniques to Detect Centrifugal Compressors Instabilities in Large Volume Power Plants
(The American Society of Mechanical Engineers (ASME), 2020)This paper shows signal processing techniques applied to experimental data obtained from a T100 microturbine connected with different volume sizes. This experimental activity was conducted by means of the test rig developed ... -
Development of the Functional Gradient Turbine Wheel With Cooled Blades Without Lock Connection
(The American Society of Mechanical Engineers (ASME), 2020)The blisk design of the wheel with cooled blades is developed on the basis of the turbine wheel with a detachable connection of the blades with the disk. The blades of the blisk are produced from casting heat-resistant ... -
On the Effect of Supplied Flow Rate to the Performance of a Tilting-Pad Journal Bearing—Static Load and Dynamic Force Measurements
(The American Society of Mechanical Engineers (ASME), 2020)Rotating machinery relies on engineered tilting-pad journal bearings (TPJB) to provide static load support with minimal drag power losses, safe pad temperatures, and ensuring a rotor-dynamic stable rotor operation. End ... -
Computational Fluid Dynamics Analysis of Floating Offshore Wind Turbines in Severe Pitching Conditions
(The American Society of Mechanical Engineers (ASME), 2020)The unsteady aerodynamics of floating wind turbines is more complex than that of fixed-bottom turbines, and the uncertainty of low-fidelity predictions is higher for floating turbines. Navier–Stokes computational fluid ...