Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1421-1440 of 9564
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The Role of the Centerbody Wake on the Precessing Vortex Core Dynamics of a Swirl Nozzle
(The American Society of Mechanical Engineers (ASME), 2021)The precessing vortex core (PVC) phenomenon in swirling jets is a helical instability in the flow driven by the coherent precession of the vortex breakdown bubble (VBB) around the flow axis, resulting in the helical rollup ... -
Experimental Analysis of Surge-Detection System Based on Pressure Derivatives at Part-Speed Operation
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents tests of an antisurge system based on pressure derivatives. The control algorithm was proven to work on different machines and with different unstable flow phenomena. Compressors are known to be affected ... -
Effect of Cross-Flow Swirl on the Trajectory of Spray in an Annular Passage
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents the experimental analysis of the impact of swirl number of cross-flowing air stream on liquid jet spray trajectory at a fixed air flow velocity of 42 m/s with the corresponding Mach number of 0.12. The ... -
Phenomenological Analysis of the Combustion of Gaseous Fuels to Measure the Energy Quality and the Capacity to Produce Work in Spark Ignition Engines
(The American Society of Mechanical Engineers (ASME), 2021)Combustion at the knocking threshold (KT) was tested using fuels with different methane numbers (MN) in a modified spark ignition (SI) engine, with high compression ratio (CR) with high turbulence intensity to the combustion ... -
Experimental Investigation of a Small-Scale Organic Rankine Cycle Turbo-Generator Supported on Gas-Lubricated Bearings
(The American Society of Mechanical Engineers (ASME), 2021)Waste heat recovery (WHR) is expected to contribute to reducing CO2 emissions from trucks. Organic Rankine cycle (ORC) systems show the highest potential for this application, but still lack efficient small-scale expansion ... -
A Three-Dimensional Tube Bundle Model Analysis for Leakage Flow Characteristics of Variable Bristle Diameter Brush Seals With Bristle Pack Stratification
(The American Society of Mechanical Engineers (ASME), 2021)The leakage flow characteristics of the variable bristle diameter (VBD) brush seals are numerically investigated using the three-dimensional (3D) tube bundle model with consideration of bristle pack stratification. The ... -
Design of Stress Constrained SiC/SiC Ceramic Matrix Composite Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2021)The structural and aerodynamic performance of a low aspect ratio SiC/SiC ceramic matrix composite (CMC) high pressure turbine (HPT) blade was determined. The application was a NASA notional single aisle aircraft engine to ... -
Emissions Performance of Staged Premixed and Diffusion Combustor Concepts for an NH3/Air Flame With and Without Reactant Humidification
(The American Society of Mechanical Engineers (ASME), 2021)Renewably generated ammonia offers a form of carbon-free chemical energy storage to meet the differences between uncertain supply and fluctuating demand and has the potential to support future energy requirements. The ... -
High-Pressure Optical Measurements of Temperature at Turbine Rotor Inlet Conditions
(The American Society of Mechanical Engineers (ASME), 2021)In gas turbine engines, the measurement of the rotor inlet temperature remains particularly challenging because of harsh operating conditions and limited access. The integrated spectral band ratio (ISBR) method is a ... -
Experimental Assessment of a Sliding-Blade Inside-Out Ceramic Turbine
(The American Society of Mechanical Engineers (ASME), 2021)In order to reach 40% efficiency, sub-MW turbines must operate in a recuperated gas Brayton cycle at a turbine inlet temperature (TIT) above 1300 °C. Current sub-MW turbines have material-related operating temperature ... -
Lean Operation of a Pulse Detonation Combustor by Fuel Stratification
(The American Society of Mechanical Engineers (ASME), 2021)Pressure gain combustion is a promising concept to substantially increase the thermal efficiency of gas turbines. One possible implementation that has been frequently investigated is pulse detonation combustors (PDCs), as ... -
Auto-Ignition of Gas Turbine Lubricating Oils in a Shock Tube Using Spray Injection
(The American Society of Mechanical Engineers (ASME), 2021)In choosing the lubricating oil for a gas turbine system, properties such as viscosity, viscosity index, corrosion prevention, and thermal stability are chosen to optimize turbine longevity and efficiency. Another property ... -
Experimental and Numerical Investigation of Ultra-Wet Methane Combustion Technique for Power Generation
(The American Society of Mechanical Engineers (ASME), 2021)Using steam as a heat carrier and working media has merits to increase electric efficiency up to 60% and decrease NOx emission to single-digit compared to dry gas turbine cycles. These attribute primarily to the physical ... -
Interaction Between Coriolis Forces and Mistuning on a Cyclic Symmetric Structure With Geometrical Nonlinearity
(The American Society of Mechanical Engineers (ASME), 2021)An investigation of the interaction between Coriolis forces and mistuning on a cyclic symmetric structure is presented in this paper. The sensitivity of the eigenvalues and eigenvectors to mistuning is first studied with ... -
Equivalent Linearization of Bladed Disk Assemblies With Friction Nonlinearities Under Random Excitation
(The American Society of Mechanical Engineers (ASME), 2021)This article addresses the vibrational behavior of bladed disk assemblies with nonlinear shroud coupling under random excitation. In order to increase the service life and safety of turbine blades, intense calculations are ... -
Impact of Syngas Addition to Methane on Laminar Burning Velocity
(The American Society of Mechanical Engineers (ASME), 2021)Exhaust gas recirculation (EGR) in spark-ignited (SI) engines is a key technique to reduce in-cylinder NOx production by decreasing the combustion temperature. The major species of the exhaust gas in rich combustion of ... -
Numerical Investigations of Leakage Performance Degradations in Labyrinth and Flexible Seals Due to Wear
(The American Society of Mechanical Engineers (ASME), 2021)The finite element analysis (FEA) and computational fluid dynamics (CFD) methods are utilized to investigate the leakage performance degradations in two kinds of flexible seals (i.e., forward bending and backward bending) ... -
The Potential of a Multifidelity Approach to Gas Turbine Combustor Design Optimization
(The American Society of Mechanical Engineers (ASME), 2021)The desire to reduce gas turbine emissions drives the use of design optimization approaches within the combustor design process. However, the relative cost of combustion simulations can prohibit such optimizations from ... -
Numerical Characterization of the Performance Curve of a Regenerative Pump-as-Turbine
(The American Society of Mechanical Engineers (ASME), 2021)Energy companies in the power generation field are continuously searching for green technologies to reduce pollutant emissions. In that context, small hydropower plants represent an attractive solution for distributed ... -
Numerical Investigation of a Mistuned Academic Bladed Disk Dynamics With Blade/Casing Contact
(The American Society of Mechanical Engineers (ASME), 2021)This contribution focuses on the combined analysis of mistuning and unilateral blade-tip/casing contacts. A two-dimensional (2D) phenomenological finite element (FE) model of an aircraft engine fan stage is considered. It ...