Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 4141-4160 of 9564
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Quantifying Cyclic Variability in a Multicylinder HCCI Engine With High Residuals
(The American Society of Mechanical Engineers (ASME), 2012)Cyclic variability (CV) in lean homogeneous charge compression ignition (HCCI) combustion at the limits of operation is a known phenomenon, and this work aims at investigating the dominant effects ... -
Acoustic Response of a Helmholtz Resonator Exposed to Hot-Gas Penetration and High Amplitude Oscillations
(The American Society of Mechanical Engineers (ASME), 2012)Helmholtz resonators are often used in the gas turbine industry for the damping of thermoacoustic instabilities. To prevent thermal destruction, these devices are usually cooled by a purging ... -
The Effect of Particle Size and Film Cooling on Nozzle Guide Vane Deposition
(The American Society of Mechanical Engineers (ASME), 2012)An accelerated deposition test facility is used to study the effect of particle size and film cooling on deposit roughness, spatial distribution, and thickness. Tests were run at gas turbine ... -
Prediction Reliability of a Statistical Methodology for Gas Turbine Prognostics
(The American Society of Mechanical Engineers (ASME), 2012)The performance of gas turbines degrades over time and, as a consequence, a decrease in gas turbine performance parameters also occurs, so that they may fall below a given threshold value. ... -
Tribological Behaviors of Titanium Nitride- and Chromium-Nitride-Based Physical Vapor Deposition Coating Systems
(The American Society of Mechanical Engineers (ASME), 2012)This study investigates the effects of the deposition process and coating composition on microstructural and tribological properties of TiN- and CrN-based coating systems. Coatings were produced ... -
Impact of Manufacturing Variability on Multistage High-Pressure Compressor Performance
(The American Society of Mechanical Engineers (ASME), 2012)The present paper introduces a novel approach for considering manufacturing variability in the numerical simulation of a multistage high-pressure compressor (HPC). The manufacturing process is ... -
Effects of Charge Preheating Methods on the Combustion Phasing Limitations of an HCCI Engine With Negative Valve Overlap
(The American Society of Mechanical Engineers (ASME), 2012)Homogeneous charge compression ignition (HCCI) has the potential to reduce both fuel consumption and NOx emissions compared to normal spark-ignited (SI) combustion. For a relatively low compression ... -
Empirical Study of Simultaneously Low NOx and Soot Combustion With Diesel and Ethanol Fuels in Diesel Engine
(The American Society of Mechanical Engineers (ASME), 2012)Diesel low temperature combustion (LTC) is capable of producing diesel-like efficiency while emitting ultra-low nitrogen oxides (NOx ) and soot emissions. Previous work indicates that well-controlled ... -
Characterization of Stiffness and Damping in Textured Sector Pad Micro Thrust Bearings Using Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2012)In the present paper, a study of stiffness and damping in sector-pad micro thrust bearings with artificial surface texturing is presented, based on computational fluid dynamics (CFD) simulations. ... -
Crack Detection in a Rotor Dynamic System by Vibration Monitoring—Part II: Extended Analysis and Experimental Results
(The American Society of Mechanical Engineers (ASME), 2012)An increase in the power-to-weight ratio demand on rotordynamic systems causes increased susceptibility to transverse fatigue cracking of the shaft. The ability to detect cracks at an early stage ... -
A Mobile Test Rig for Micro Gas Turbines Based on a Thermal Power Measurement Approach
(The American Society of Mechanical Engineers (ASME), 2012)It is widely considered that micro gas turbines are potential devices for future energy needs. However, many micro gas turbine development projects have failed, particularly those with a very ... -
On The Nonlinear Dynamics of Two Types of Backup Bearings — Theoretical and Experimental Aspects
(The American Society of Mechanical Engineers (ASME), 2012)The possible contact between rotor and stator can for some cases be considered a serious malfunction that may lead to catastrophic failure. Rotor rub is considered a secondary phenomenon caused ... -
Modeling Contra-Rotating Turbomachinery Components for Engine Performance Simulations: The Geared Turbofan With Contra-Rotating Core Case
(The American Society of Mechanical Engineers (ASME), 2012)This paper presents a method of modeling contra-rotating turbomachinery components for engine performance simulations. The first step is to generate the performance characteristics of such components. ... -
Evaluation of Design Performance of the Semi-Closed Oxy-Fuel Combustion Combined Cycle
(The American Society of Mechanical Engineers (ASME), 2012)This study aims to present various design aspects and realizable performance of the natural gas fired semi-closed oxy-fuel combustion combined cycle (SCOC-CC). The design parameters of the cycle ... -
The Impact of Compressor Exit Conditions on Fuel Injector Flows
(The American Society of Mechanical Engineers (ASME), 2012)This paper examines the effect of compressor generated inlet conditions on the air flow uniformity through lean burn fuel injectors. Any resulting nonuniformity in the injector flow field can ... -
Characterization of the Acoustic Interactions in a Two-Stage Multi-Injection Combustor Fed With Liquid Fuel
(The American Society of Mechanical Engineers (ASME), 2012)Burners operating in lean premixed prevaporized (LPP) regimes are considered as good candidates to reduce pollutant emissions from gas turbines. Lean combustion regimes result in lower burnt gas ... -
Considerations on the Numerical Modeling and Performance of Axial Swirlers Under Relight Conditions
(The American Society of Mechanical Engineers (ASME), 2012)Numerical modeling of aero engine combustors under relight conditions is a matter of continuously increasing importance due to the demanding engine certification regulations. In order to reduce ... -
Performance Characteristics of an Operating Supercritical CO2 Brayton Cycle
(The American Society of Mechanical Engineers (ASME), 2012)Supercritical CO2 (S-CO2 ) power cycles offer the potential for better overall plant economics due to their high power conversion efficiency over a moderate range of heat source temperatures, ... -
Using Boundary Conditions to Account for Mean Flow Effects in a Zero Mach Number Acoustic Solver
(The American Society of Mechanical Engineers (ASME), 2012)The present study is devoted to the modeling of mean flow effects while computing thermoacoustic modes under the zero Mach number assumption. It is first recalled that the acoustic impedance ... -
Analytical Analysis of Indirect Combustion Noise in Subcritical Nozzles
(The American Society of Mechanical Engineers (ASME), 2012)This article revisits the problem of indirect combustion noise in nozzles of finite length. The analytical model proposed by Moase for indirect combustion noise is rederived and applied to ...