Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1301-1320 of 9564
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Transient Flutter Stability Analysis of Structural Mistuned Blisk by Energy Growth Method
(The American Society of Mechanical Engineers (ASME), 2021)Blisks suffer from flutter, a self-sustained vibration caused by aerodynamic coupled forces. This instability could cause serious damage to the blades and the machine. Flutter stability is usually analyzed based on the ... -
Reductions in Unburned Ammonia and Nitrous Oxide Emissions From an Ammonia-Assisted Diesel Engine With Early Timing Diesel Pilot Injection
(The American Society of Mechanical Engineers (ASME), 2021)The global drive to limit the effects of climate change affords a strong incentive to reduce CO2 emissions. H2 is one of the cleanest energy sources, because its combustion does not produce CO2. It is well known that NH3 ... -
Short-Term Optimization of a Combined Cycle Power Plant Integrated With an Inlet Conditioning Unit
(The American Society of Mechanical Engineers (ASME), 2021)Under new scenarios with high shares of renewable electricity, combined cycle gas turbines (CCGTs) are required to improve their flexibility to help balance the power system. Simultaneously, liberalization of electricity ... -
Design of a Compact Magnetically Levitated Blower for Space Applications
(The American Society of Mechanical Engineers (ASME), 2021)NASA is leading the design and development of a next-generation CO2 removal system, the four bed carbon dioxide scrubber (4BCO2), and intends to use the International Space Station (ISS) as its testbed. A key component of ... -
Turbulence Anisotropy Investigations in an Internal Combustion Engine
(The American Society of Mechanical Engineers (ASME), 2021)The assumption of isotropic turbulence is commonly incorporated into models of the internal combustion engine (ICE) in-cylinder flows. While preliminary analysis with two-dimensional (2D) velocity data indicates that the ... -
Investigation of Reverse Flow Slinger Combustor With Jet A-1 and Methanol
(The American Society of Mechanical Engineers (ASME), 2021)This paper describes an experimental investigation of the reverse flow slinger (RFS) combustor that has been developed in order to attain high flame stability and low emissions in gas turbine (GT) engines. The combustor ... -
A Comprehensive Heat Transfer Study Inside a Steam Turbine Valve: Experiment, Numerical Simulation, and Simplified Model
(The American Society of Mechanical Engineers (ASME), 2021)In a steam turbine system, one of the main factors limiting the operational flexibility is the thermal stress associated with a high-temperature gradient within the control valves, which often leads to structural damage ... -
Development of an Efficient Conjugate Heat Transfer Modeling Framework to Optimize Mixing-Limited Combustion of Ethanol in a Diesel Engine
(The American Society of Mechanical Engineers (ASME), 2021)Mixing controlled combustion of alcohol fuels has been identified as a promising technology based on their low propensity for particulate and NOx production, but the higher heats of vaporization and auto-ignition temperatures ... -
Nonlinear Vibration Analysis of a Flexible Rotor Supported by a Flexure Pivot Tilting Pad Journal Bearing in Comparison to a Fixed Profile Journal Bearing With Experimental Verification
(The American Society of Mechanical Engineers (ASME), 2021)In this paper, an efficient numerical method consisting of the real mode component mode synthesis (CMS) model reduction, shooting method with parallel computing, and Floquet analysis was developed for nonlinear rotordynamics ... -
A Time–Space Multigrid Method for Efficient Solution of the Harmonic Balance Equation System
(The American Society of Mechanical Engineers (ASME), 2021)In this article, an efficient time–space multigrid (TS-MG) method for solving the harmonic balance (HB) equation system is proposed. The principle of the time–space multigrid method is to coarsen grids in both space and ... -
Analysis of Shroud and Disk Heat Transfer in Aero-Engine Compressor Rotors
(The American Society of Mechanical Engineers (ASME), 2021)Heat transfer within the rotating compressor cavity of an aero-engine is predominantly governed by buoyancy, which can be characterized by the Grashof number. Unsteady and unstable buoyancy-induced flow structures influence ... -
Assessment of Turbulent Combustion Models for Simulating Prechamber Ignition in a Natural Gas Engine
(The American Society of Mechanical Engineers (ASME), 2021)Lean combustion is a promising strategy to increase thermal efficiency in an internal combustion engine, by exploiting a favorable specific heat ratio of the fresh mixture while simultaneously suppressing the heat losses ... -
Torsional Vibration Extraction of Dual-Period Instantaneous Angular Speed Measurement of the Generalized Incremental Encoder
(The American Society of Mechanical Engineers (ASME), 2021)Torsional vibration is key information in monitoring the condition of the shaft system. Using the vector superposition principle, the relationship between the rotation motion and the torsional vibration of the shaft is ... -
Electric Power Transfer Concept for Enhanced Performance of the More Electric Engine
(The American Society of Mechanical Engineers (ASME), 2021)In future electrified aircraft, multispool more electric engines (MEEs) are expected to be equipped with electric generators connected to each shaft for power offtake and supplying onboard electrical loads. These can be ... -
Numerical Study of Ammonia/O2-Fired Semiclosed Cycle Gas Turbine for Oxy-Fuel IGCC Power Generation With CO2 Capture
(The American Society of Mechanical Engineers (ASME), 2021)With an increase in renewable energy generation, thermal power generation has been switched to standby power in various parts of the world. Ammonia, one of the storage and transport media for H2, is produced in a highly ... -
Performance of a Turbine Rim Seal Subject to Rotationally-Driven and Pressure-Driven Ingestion
(The American Society of Mechanical Engineers (ASME), 2021)This experimental study considered the performance of a chute rim seal downstream of turbine nozzle guide vanes (but without rotor blades). The experimental setup reproduced rotationally-driven ingestion without vanes and ... -
Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Design and Proof of Concept Testing
(The American Society of Mechanical Engineers (ASME), 2021)The following paper presents a new type of gas lubricated thrust bearing that utilizes additive manufacturing or also known as direct metal laser melting (DMLM) to fabricate the bearing. The motivation for the new bearing ... -
Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Experimental Evaluation and Fluid–Structure Model Predictions
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents rotating test results and advances an analytical predictive fluid–structure model for a new type of gas-lubricated thrust bearing fabricated using direct metal laser melting. The bearing concept in this ... -
Experimental Investigation Into the Role of Mean Flame Stabilization on the Combustion Dynamics of High-Hydrogen Fuels in a Turbulent Combustor
(The American Society of Mechanical Engineers (ASME), 2021)A bluff-body turbulent combustor is mapped for its thermo-acoustic stability across variation in airflow rate, nondimensionalized as the Reynolds number (Re) and fuel composition. The combustor stability is evaluated for ... -
The Effect of the Degree of Premixedness on Self-Excited Combustion Instability
(The American Society of Mechanical Engineers (ASME), 2021)The use of lean, premixed fuel and air mixtures is a common strategy to reduce NOx emissions in gas turbine combustors. However, this strategy causes an increased susceptibility to self-excited instability, which manifests ...