Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2281-2300 of 9564
-
Modal Analysis of Fuel Injection Systems and the Determination of a Transfer Function Between Rail Pressure and Injection Rate
(The American Society of Mechanical Engineers (ASME), 2018)A detailed analysis of a common rail (CR) fuel injection system, equipped with solenoid injectors for Euro 6 diesel engine applications, has been performed in the frequency domain. A lumped parameter numerical model of the ... -
Numerical Analysis of the Impact of Manufacturing Errors on the Structural Stiffness of Foil Bearings
(The American Society of Mechanical Engineers (ASME), 2018)The dynamic characteristics of foil bearings operating at high rotation speeds depend very much on the mechanical characteristics of the foil structure. For this reason, the stiffness and damping of the structure of foil ... -
New Methodology for the Identification of the Leakage Paths and Guidelines for the Design of Common Rail Injectors With Reduced Leakage
(The American Society of Mechanical Engineers (ASME), 2018)The static leakage of a common rail (CR) injector is the flow-rate that is recirculated from the injector when the pilot-stage is not actuated. It is a critical issue in the development of modern CR injectors, because it ... -
Resistant Statistical Methodologies for Anomaly Detection in Gas Turbine Dynamic Time Series: Development and Field Validation
(The American Society of Mechanical Engineers (ASME), 2018)The reliability of gas turbine (GT) health state monitoring and forecasting depends on the quality of sensor measurements directly taken from the unit. Outlier detection techniques have acquired a major importance, as they ... -
Assessment of Unsteadiness Modeling for Transient Natural Convection
(The American Society of Mechanical Engineers (ASME), 2018)Turbine flexible operations with faster startups/shutdowns are required to accommodate emerging renewable power generations. A major challenge in transient thermal design and analysis is the time scale disparity. For natural ... -
A Comprehensive Approach for Detection, Classification, and Integrated Diagnostics of Gas Turbine Sensors
(The American Society of Mechanical Engineers (ASME), 2018)Anomaly detection in sensor time series is a crucial aspect for raw data cleaning in gas turbine (GT) industry. In addition to efficiency, a successful methodology for industrial applications should be also characterized ... -
Dynamic Characterization of an Integral Squeeze Film Bearing Support Damper for a Supercritical Co2 Expander
(The American Society of Mechanical Engineers (ASME), 2018)The present work advances experimental results and analytical predictions on the dynamic performance of an integral squeeze film damper (ISFD) for application in a high-speed super-critical CO2 (sCO2) expander. The test ... -
Optimization of Statistical Methodologies for Anomaly Detection in Gas Turbine Dynamic Time Series
(The American Society of Mechanical Engineers (ASME), 2018)Statistical parametric methodologies are widely employed in the analysis of time series of gas turbine (GT) sensor readings. These methodologies identify outliers as a consequence of excessive deviation from a statistical-based ... -
Continuous Lubricant Film Thickness Measurement Between Piston Ring and Cylinder Bore
(The American Society of Mechanical Engineers (ASME), 2018)Measurement of film thickness between piston ring and cylinder bore has been a challenge for decades; laser-induced fluorescence (LIF) method was used by several groups, and promising results are obtained for the investigation ... -
Flame Dynamics Intermittency in the Bistable Region Near a Subcritical Hopf Bifurcation
(The American Society of Mechanical Engineers (ASME), 2018)We report experimental evidence of thermoacoustic bistability in a lab-scale turbulent combustor over a well-defined range of fuel–air equivalence ratios. Pressure oscillations are characterized by an intermittent behavior ... -
Three Way Catalyst-Selective Catalytic Reduction Aftertreatment System Evaluation for a Lean Burn Gasoline Engine Operating in Homogenous Charge Compression Ignition, Spark-Assisted Compression Ignition, and Spark-Ignited Combustion Modes
(The American Society of Mechanical Engineers (ASME), 2018)Low temperature and dilute homogenous charge compression ignition (HCCI) and spark-assisted compression ignition (SACI) can improve fuel efficiency and reduce engine-out NOx emissions, especially during lean operation. ... -
An Experimental Investigation of Early Flame Development in an Optical Spark Ignition Engine Fueled With Natural Gas
(The American Society of Mechanical Engineers (ASME), 2018)Improved internal combustion engine simulations of natural gas (NG) combustion under conventional and advanced combustion strategies have the potential to increase the use of NG in the transportation sector in the U.S. ... -
Numerical Study on the Reduction of NOx Emissions From Pulse Detonation Combustion
(The American Society of Mechanical Engineers (ASME), 2018)A change in the combustion concept of gas turbines from conventional isobaric to constant volume combustion, such as in pulse detonation combustion (PDC), promises a significant increase in gas turbine efficiency. Current ... -
Flow Resistance Coefficients of Porous Brush Seal as a Function of Pressure Load
(The American Society of Mechanical Engineers (ASME), 2018)Developments in brush seal analyses tools have been covering advanced flow and structural analyses since brush seals are applied at elevated pressure loads, temperatures, surface speeds, and transients. Brush seals have ... -
Investigation of Biodiesel Combustion and Emissions Using Reduced Chemical Kinetics
(The American Society of Mechanical Engineers (ASME), 2018)This paper studies the differences in spray structure and emissions trends between diesel and biodiesel fuels in a compression ignition engine. A computationally efficient and predictive quasi-dimensional simulation model ... -
Fuel Stratification and Partially Premixed Combustion With Neat n-Butanol in a Compression Ignition Engine
(The American Society of Mechanical Engineers (ASME), 2018)Homogeneous charge compression ignition (HCCI) has been considered as an ideal combustion mode for compression ignition (CI) engines due to its superb thermal efficiency and low emissions of nitrogen oxides (NOx) and ... -
Theoretical Analysis of Brush Seals Leakage Using Local Computational Fluid Dynamics Estimated Permeability Laws
(The American Society of Mechanical Engineers (ASME), 2018)Brush seals are a mature technology that has generated extensive experimental and theoretical work. Theoretical models range from simple correlations with experimental results to advanced numerical approaches coupling the ... -
Technology-Based Recontouring of Blade Integrated Disks After Weld Repair
(The American Society of Mechanical Engineers (ASME), 2018)The widespread adoption of blade integrated disks (blisks) made of titanium demands tailored regeneration processes to increase sustainability and economic efficiency. High standards regarding geometrical accuracy and ... -
Modeling Reichardt's Formula for Eddy Viscosity in the Fluid Film of Tilting Pad Thrust Bearings
(The American Society of Mechanical Engineers (ASME), 2018)Oil-lubricated bearings are widely used in high-speed rotating machines such as those used in the aerospace and automotive industries that often require this type of lubrication. However, environmental issues and risk-adverse ... -
Toward Higher Micro Gas Turbine Efficiency and Flexibility—Humidified Micro Gas Turbines: A Review
(The American Society of Mechanical Engineers (ASME), 2018)Micro gas turbines (mGTs) offer several advantages for small-scale combined heat and power (CHP) production compared to their main competitors, the internal combustion engines (ICEs), such as low vibration level, cleaner ...