Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2361-2380 of 9564
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Experimental Study of the Static and Dynamic Characteristics of a Long Smooth Seal With Two-Phase, Mainly Air Mixtures
(The American Society of Mechanical Engineers (ASME), 2017)A two-phase annular seal stand (2PASS) has been developed at the Turbomachinery Laboratory of Texas A&M University to measure the leakage and rotordynamic coefficients of division wall or balance-piston annular seals ... -
Bending Fatigue of Thermal Barrier Coatings
(The American Society of Mechanical Engineers (ASME), 2017)Thermal barrier coatings (TBCs) are ceramic coatings used in gas turbines to lower the base metal temperature. During operation, the TBC may fail through, for example, fatigue. In this study, a TBC system deposited on a ... -
Heat Transfer of Winglet Tips in a Transonic Turbine Cascade
(The American Society of Mechanical Engineers (ASME), 2017)Understanding the heat transfer of winglet tips is crucial for their applications in high-pressure turbines. The current paper investigates the heat transfer performance of three different winglet-cavity tips in a transonic ... -
Foreign Object Damage in an Oxide/Oxide Ceramic Matrix Composite Under Prescribed Tensile Loading
(The American Society of Mechanical Engineers (ASME), 2017)Foreign object damage (FOD) behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was characterized at ambient temperature by using spherical projectiles impacted at velocities ranging from 100 to 350 m/s. ... -
Assessment of Scale-Resolved Computational Fluid Dynamics Methods for the Investigation of Lean Burn Spray Flames
(The American Society of Mechanical Engineers (ASME), 2017)Incoming standards on NOx emissions are motivating many aero-engines manufacturers to adopt the lean burn combustion concept. However, several technological issues have to be faced in this transition, among which limited ... -
Online Monitoring of Thermoacoustic Eigenmodes in Annular Combustion Systems Based on a State-Space Model
(The American Society of Mechanical Engineers (ASME), 2017)Thermoacoustic instabilities have the potential to restrict the operability window of annular combustion systems, primarily as a result of azimuthal modes. Azimuthal acoustic modes are composed of counter-rotating wave ... -
Early Fault Detection of Hot Components in Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2017)The working environment of hot components is the most adverse of all gas turbine components. Malfunction of hot components is often followed by catastrophic consequences. Early fault detection plays a significant role in ... -
Numerical Investigation of Boundary Layers in Wet Steam Nozzles
(The American Society of Mechanical Engineers (ASME), 2017)Condensing nozzle flows have been used extensively to validate wet steam models. Many test cases are available in the literature, and in the past, a range of numerical studies have dealt with this challenging task. It is ... -
Measurements and Modeling of Ingress in a New 1.5-Stage Turbine Research Facility
(The American Society of Mechanical Engineers (ASME), 2017)In gas turbines, hot mainstream flow can be ingested into the wheel-space formed between stator and rotor disks as a result of the circumferential pressure asymmetry in the annulus; this ingress can significantly affect ... -
A Computational Fluid Dynamics Simulation of Oil–Air Flow Between the Cage and Inner Race of an Aero-engine Bearing
(The American Society of Mechanical Engineers (ASME), 2017)In aero-engines, the shafts are supported on bearings that carry the radial and axial loads. A ball bearing is made up of an inner race, an outer race, and a cage, which contains the balls, these together comprise the ... -
Solid Element Rotordynamic Modeling of a Rotor on a Flexible Support Structure Utilizing Multiple-Input and Multiple-Output Support Transfer Functions
(The American Society of Mechanical Engineers (ASME), 2017)The authors present an improved modeling approach to analyze the coupled rotor-support dynamics by modeling the rotor with solid finite elements (FEs) and utilizing multiple-input and multiple-output transfer functions ... -
Nonrealizability Problem With Quadrature Method of Moments in Wet-Steam Flows and Solution Techniques
(The American Society of Mechanical Engineers (ASME), 2017)The quadrature method of moments (QMOM) has recently attracted much attention in representing the size distribution of liquid droplets in wet-steam flows using the n-point Gaussian quadrature. However, solving transport ... -
Pre-optimization of Asymmetrical Underplatform Dampers
(The American Society of Mechanical Engineers (ASME), 2017)The numerical coupled optimization of an underplatform damper is the exploration of its dynamics through a finite element model which includes both the damper and the blades. This is an effective approach if the initial ... -
Uncertainty Quantification of Growth Rates of Thermoacoustic Instability by an Adjoint Helmholtz Solver
(The American Society of Mechanical Engineers (ASME), 2017)Thermoacoustic instabilities are often calculated with Helmholtz solvers combined with a low-order model for the flame dynamics. Typically, such a formulation leads to an eigenvalue problem in which the eigenvalue appears ... -
Reduced-Order Models for Blisks With Small and Large Mistuning and Friction Dampers
(The American Society of Mechanical Engineers (ASME), 2017)In operation, rotating bladed disks (blisks) are often subject to high levels of dynamic loading, resulting in large amplitudes of forced vibrations especially at resonance. Moreover, variations in structural properties ... -
Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Startup and Coastdown
(The American Society of Mechanical Engineers (ASME), 2017)It is well known that the vibrational behavior of a mistuned bladed disk differs strongly from that of a tuned bladed disk. A large number of publications dealing with the dynamics of mistuned bladed disks are available ... -
Parametrically Induced Damping in a Cracked Rotor
(The American Society of Mechanical Engineers (ASME), 2017)A transverse shaft crack in a rotor is usually modeled as a local change in shaft stiffness. This local stiffness change is not constant and varies as a result of a so-called breathing mechanism, explained with periodical ... -
Estimation of the Particle Deposition on a Subsonic Axial Compressor Blade
(The American Society of Mechanical Engineers (ASME), 2017)The quality and purity of the air entering a gas turbine is a significant factor influencing its performance and life. Foulants in the ppm range which are not captured by the air filtration system usually cause deposits ... -
Influence of Honeycomb Rubbing on the Labyrinth Seal Performance
(The American Society of Mechanical Engineers (ASME), 2017)The aircraft engine operates in various conditions. In consequence, the design of seals must take account of the seal clearance changes and the risk of rubbing. A small radial clearance of the rotor tip seal leads to the ... -
Parameterizing Compact and Extensible Compressor Models Using Orthogonal Distance Minimization
(The American Society of Mechanical Engineers (ASME), 2017)A complete and compact control-oriented compressor model consisting of a mass flow submodel and an efficiency submodel is described. The final application of the model is a complete two-stroke mean value engine model (MVEM) ...