Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1641-1660 of 9564
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Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense Gases
(The American Society of Mechanical Engineers (ASME), 2020)Generic models are proposed to evaluate the skin friction coefficient acting on enclosed rotating disks and cylinders under various flow regimes. In particular, a model taking into account the inner radius of the disk is ... -
Comparison of Machine Learning Algorithms in the Interpolation and Extrapolation of Flame Describing Functions
(The American Society of Mechanical Engineers (ASME), 2020)This paper examines and compares the commonly used machine learning algorithms in their performance in interpolation and extrapolation of flame describing function (FDFs), based on experimental and simulation data. Algorithm ... -
Quantifying the Effect of Kinetic Uncertainties on NO Predictions at Engine-Relevant Pressures in Premixed Methane–Air Flames
(The American Society of Mechanical Engineers (ASME), 2020)Accurate and robust thermochemical models are required to identify future low-NOx technologies that can meet the increasingly stringent emissions regulations in the gas turbine industry. These mechanisms are generally ... -
Cycle Optimization Potential of Composite Cycle and Turbocompound Aero-Engines
(The American Society of Mechanical Engineers (ASME), 2020)Fair comparison of future aircraft engine concepts requires the assumption of similar technological risk and a transparent book keeping of losses. A 1000 km and a 7000 km flight mission of a single-aisle airplane similar ... -
An Investigation on Performance of an Asymmetric Twin-Scroll Turbine With a Small Scroll Bypass Wastegate for a Heavy-Duty Diesel Engine
(The American Society of Mechanical Engineers (ASME), 2020)In this paper, a novel one-dimensional matching method of an asymmetric twin-scroll turbine (ATST) with a small scroll bypass wastegate is initially presented for energy improvement. The developed method presents further ... -
A Modal Parameter Identification Method Based on Improved Covariance-Driven Stochastic Subspace Identification
(The American Society of Mechanical Engineers (ASME), 2020)For the quantitative dynamic analysis of aero gas turbines, accurate modal parameters must be identified. However, the complicated structure of thin-walled casings may cause false mode identification and mode absences if ... -
Implementation of Optimized Artificial Neural Networks for Real-Time Estimation of Low Pressure Cooled Exhaust Gas Recirculation in a Turbocharged Gasoline Direct Injection Engine Using a Model-Based Design Approach
(The American Society of Mechanical Engineers (ASME), 2020)Low pressure cooled exhaust gas recirculation (LP-EGR) system has been widely adopted to improve energy efficiency in turbocharged gasoline direct injection (GDI) engines. In order to utilize complete beneficial effects ... -
Effect of Nitromethane Addition on the Performance of Two-Stroke Spark Ignition Unmanned Aerial Vehicles Piston Engine
(The American Society of Mechanical Engineers (ASME), 2020)Nitromethane has a stoichiometric air–fuel ratio of 1.7, which is 8.5 times lower than gasoline. For the same amount of air being drawn by the engine, more amount of nitromethane blends and hence more energy can be added. ... -
Experimental Research of Diffusion Combustion and Emissions Characteristics Under Oxy-Fuel Combustion Mode
(The American Society of Mechanical Engineers (ASME), 2020)Internal combustion Rankine cycle (ICRC) concept implements oxy-fuel combustion, direct water injection (DWI), and waster heat recovery (WHR) into traditional Otto or diesel cycle to realize high thermal efficiency and low ... -
Study on the Fuel Flexibility of a Microgas Turbine Combustor Burning Different Mixtures of H2, CH4, and CO2
(The American Society of Mechanical Engineers (ASME), 2020)The aim of this work is to analyze the behavior of the fuel flexible Ansaldo ARI100 T2 microgas turbine (MGT) combustor operated with mixtures having different H2, CH4, and CO2 concentrations. This combustor is going to ... -
Commissioning of a Combined Hot-Streak and Swirl Profile Generator in a Transonic Turbine Test Facility
(The American Society of Mechanical Engineers (ASME), 2020)By enhancing the premixing of fuel and air prior to combustion, recently developed lean-burn combustor systems have led to reduced NOx and particulate emissions in gas turbines. Lean-burn combustor exit flows are typically ... -
A Comparison of Static and Rotordynamic Characteristics for Two Types of Liquid Annular Seals With Parallelly Grooved Stator/Rotor
(The American Society of Mechanical Engineers (ASME), 2020)Liquid annular seals with parallelly grooved stator or rotor are used as replacements for smooth plain seals in centrifugal pumps to reduce leakage and break up contaminants within the working fluid. Parallelly grooved ... -
Effect of the Swirl Intensity of Pilot Inner Swirler on the Combustion Stability of a Lean Staged Injector With a Prefilm Atomizer
(The American Society of Mechanical Engineers (ASME), 2020)Lean staged combustion can reduce the NOx emissions by prevaporizing and premixing fuel with air, which is considered the state-of-the-art solution strategy in achieving low emission in aeronautical combustors. However, ... -
Experimental Analysis of an Ultra-Compact Combustor Powered Turbine Engine
(The American Society of Mechanical Engineers (ASME), 2020)The innovative ultra-compact combustor (UCC) is an alternative to traditional turbine engine combustors and has been shown to reduce the combustor length and offer potential improvements in combustion efficiency. Prior UCC ... -
The Mechanism on Prediction of Transient Maximum Amplitude for Tuned and Mistuned Blisks
(The American Society of Mechanical Engineers (ASME), 2020)Blisks are subjected to frequent acceleration and deceleration, which leads to a transient forced response; however, there is limited understanding of this response. In this work, the mechanism on prediction of transient ... -
Performance Analysis and Improvement of a Centrifugal Compressor Based on Partial Similarity Principle
(The American Society of Mechanical Engineers (ASME), 2020)In this paper, with the help of partial similarity principle, aerodynamic performance of a centrifugal compressor in a turbocharger unit is analyzed and improved based on a low-speed large-scaled model. In order to achieve ... -
Analysis of Instantaneous Vibrational Energy Flow for an Aero-Engine Dual-Rotor–Support–Casing Coupling System
(The American Society of Mechanical Engineers (ASME), 2020)The aero-engine casing is a key component for carrying loads. With the purpose of improving the thrust-weight ratio of the aero-engine, the casing is required to be designed to be as thin as possible. Therefore, the vibration ... -
Theoretical Analyses of Heat Balance in a Diesel/Natural Gas Dual-Fuel Engine at Low and Medium Loads Based on Experimental Values
(The American Society of Mechanical Engineers (ASME), 2020)In order to propose the control strategies based on exergy to realize efficient and energy-saving operation of the engine, the energy and exergy balance under sensitive boundary conditions were analyzed with the first and ... -
Optimization of a Radial Turbine for Pulsating Flows
(The American Society of Mechanical Engineers (ASME), 2020)A turbocharger turbine is exposed to pulsating flow conditions when it is connected to an engine exhaust system due to the opening and closing of the exhaust valves. However, many radial turbines are designed and tested ... -
Computational Fluid Dynamics Study of Oil Behavior in a Scoop, and Factors Affecting Scoop Capture Efficiency
(The American Society of Mechanical Engineers (ASME), 2020)Due to the continuous reduction of engine sizes, efficient under-race lubrication becomes ever more crucial in order to provide sufficient amount of oil to various engine components. An oil scoop is a rotating component ...