Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1041-1060 of 9564
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Modeling and Cycle Parameter Matching of a High-Speed Variable Cycle Turbofan-Ramjet Engine
(The American Society of Mechanical Engineers (ASME), 2022)Variable cycle turbofan-ramjet (VCTR) engine is a promising propulsion system candidate for future Mach 4+ vehicles. Compared with conventional turbine engines, the VCTR engine has a higher thrust-to-weight ratio, a smaller ... -
Impact of Boundary Condition and Kinetic Parameter Uncertainties on NOx Predictions in Methane–Air Stagnation Flame Experiments
(The American Society of Mechanical Engineers (ASME), 2022)A comprehensive understanding of uncertainty sources in experimental measurements is required to develop robust thermochemical models for use in industrial applications. Due to the complexity of the combustion process in ... -
How Do Interfacial Shear and Gravity Affect the Oil Film Characteristics Near an Aero-Engine Bearing?
(The American Society of Mechanical Engineers (ASME), 2022)Recent demand for reducing carbon emission and for increasing engine efficiency has led aero-engine manufacturers to strive for a better oil flow system. Aero-engine bearing chambers that house the shaft-support bearings ... -
Design Optimization and Variable Geometries Implementation of a High Bypass Three-Shaft Turbofan Engine for EIS2050
(The American Society of Mechanical Engineers (ASME), 2022)This paper aims to develop an advanced three-shaft turbofan engine with ultrahigh bypass ratio (BPR) for entry-into-service (EIS)2050. The boundary approaching method is utilized to obtain the optimal engine for a series ... -
Evaluation of a Turbulent Jet Flame Flashback Correlation Applied to Annular Flow Configurations With and Without Swirl
(The American Society of Mechanical Engineers (ASME), 2022)The adaptation of high hydrogen content fuels for low emissions gas turbines represents a potential opportunity to reduce the carbon footprint of these devices. The high flame speed of hydrogen air mixtures combined with ... -
System Parameter Identification of a Colored-Noise-Driven Rijke Tube Simulator
(The American Society of Mechanical Engineers (ASME), 2022)In this paper, we report an experimental investigation on the influence of colored noise (generated by the Ornstein–Uhlenbeck (OU) process) on thermoacoustic coupling in an electro-acoustic Rijke tube simulator. In the ... -
Real Time Precursor Calculation for the Early Detection of Combustion Instabilities
(The American Society of Mechanical Engineers (ASME), 2022)The proper control of the pressure fluctuations inside the gas turbine combustors is becoming a key factor to contain the pollutant emissions and extend their operability limits, as a consequence of the leaner and leaner ... -
The Application of the Arbitrary-Order Galerkin Reduction Method to the Dynamic Analysis of a Rotor With a Preloaded Single-Pad Foil-Air Bearing
(The American Society of Mechanical Engineers (ASME), 2022)The compressible Reynolds equation (RE) is typically integrated within a fully coupled dynamical foil-air bearings (FABs)-rotor system via spatial Discretization transformation, e.g., finite difference (FD), finite element ... -
A Novel Decomposition Approach Preventing Spurious Entropy Generation in Hybrid Thermoacoustic Stability Computations
(The American Society of Mechanical Engineers (ASME), 2022)Prominent approaches for the computation of thermoacoustic stability are hybrid methods like the linearized Navier–Stokes equations (LNSE) or the linearized Euler equations (LEE). The transient fluctuations around a ... -
Micro-Mixing Combustion for Highly Recuperated Gas Turbines: Effects of Inlet Temperature and Fuel Composition on Combustion Stability and NOx Emissions
(The American Society of Mechanical Engineers (ASME), 2022)The micromix combustion concept offers an elegant compromise between premixed and nonpremixed combustion. By mixing the fuel and air at the smallest scale possible, one can achieve NOx emissions comparable to premixed ... -
Gas Turbine Compressor Washing Economics and Optimization Using Genetic Algorithm
(The American Society of Mechanical Engineers (ASME), 2022)Studies have shown that online compressor washing of gas turbine engines slows down the rate of fouling deterioration during operation. However, for most operators, there is a balancing between the performance improvements ... -
A Dimension Reduction-Based Multidisciplinary Design Optimization Method for High Pressure Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2022)The complex aero-thermal coupling between fluid and solid regions within high-pressure turbines makes it important to perform multidisciplinary design optimization of high-pressure turbine blades. However, most published ... -
Gaussian Stochastic Process Modeling of Blend Repaired Airfoil Modal Response Using Reduced Basis Mode Shape Approach
(The American Society of Mechanical Engineers (ASME), 2022)A machine learning (ML) approach is developed to predict the effect of blend repairs on airfoil frequency, modal assurance criterion (MAC), and modal displacement vectors. The method is demonstrated on a transonic research ... -
Numerical Simulations of a Lifted Hydrogen Jet Flame Using Flamelet Generated Manifold Approach
(The American Society of Mechanical Engineers (ASME), 2022)A turbulent lifted H2/N2 jet flame in a vitiating coflow environment is numerically investigated, using the Flamelet generated manifold (FGM) combustion model with large eddy simulations (LES). Due to the hot vitiated ... -
Performance Investigation of a Bladeless Air Compressor
(The American Society of Mechanical Engineers (ASME), 2022)This study aims to investigate the reversible operation of a bladeless air expander prototype operated reversibly in compressor mode to understand the performance by numerical method and compare its results experimentally. ... -
Prediction of Rotating Instabilities in Low Pressure Steam Turbines Operating at Low Load
(The American Society of Mechanical Engineers (ASME), 2022)Due to the increasing need for operational flexibility nowadays, the low-pressure (LP) steam turbine might face widely variable operation conditions up to extreme low volume flow situations. Hereby, rotating instabilities ... -
Identification of Mistuning Based on Forced Response Measurements and Assessment for a Real Compressor Blisk
(The American Society of Mechanical Engineers (ASME), 2022)We develop a novel method for the identification of mistuned blisks. The method relies on forced response measurements in a certain target frequency band. Modal stiffness deviations and an overall structural damping ... -
Design of Curved Annular Diffusers II: Using Splitter Blades
(The American Society of Mechanical Engineers (ASME), 2022)The use of splitter blade as a passive flow control mechanism in the design of separation free aggressive annular diffuser is explored through computational fluid dynamics simulations. The fundamental working principle of ... -
A Novel Energy Storage System Based on Carbon Dioxide Unique Thermodynamic Properties
(The American Society of Mechanical Engineers (ASME), 2022)This paper focuses on the thermodynamic performance and techno-economic assessment of a novel electrical energy storage technology using carbon dioxide as a working fluid. This technology, named CO2 battery and recently ... -
Intercooled Recuperative Aero Engine System Optimization
(The American Society of Mechanical Engineers (ASME), 2022)By installing an intercooler and a recuperator, the intercooled recuperative aero engine (IRA) has the advantage of improving thermal efficiency as well as reducing fuel consumption and emissions. Both the aerodynamic and ...