Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 1881-1900 of 9564
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Thermoacoustic Instability Model With Porous Media: Linear Stability Analysis and the Impact of Porous Media
(The American Society of Mechanical Engineers (ASME), 2019)Lean premixed (LPM) combustion systems are susceptible to thermoacoustic instability, which occurs when acoustic pressure oscillations are in phase with the unsteady heat release rates. Porous media has inherent acoustic ... -
Analysis of Deformation of Mistuned Bladed Disks With Friction and Random Crystal Anisotropy Orientation Using Gradient-Based Polynomial Chaos Expansion
(The American Society of Mechanical Engineers (ASME), 2019)Single crystal blades used in high pressure turbine bladed disks of modern gas-turbine engines exhibit material anisotropy. In this paper, the sensitivity analysis is performed to quantify the effects of blade material ... -
Gas Turbine Fouling Offshore: Effective Online Water Wash Through High Water-to-Air Ratio
(The American Society of Mechanical Engineers (ASME), 2019)Optimized operation of gas turbines is discussed for a fleet of 11 GE LM2500PE engines at a Statoil North Sea offshore field in Norway. Three engines are generator drivers, and eight engines are compressor drivers. Several ... -
Experimental Study on Pressure Losses in Porous Materials
(The American Society of Mechanical Engineers (ASME), 2019)Recent technological advances in the field of additive manufacturing have made possible to manufacture turbine engine components characterized by controlled permeability in desired areas. These have shown great potential ... -
Experimental Study on Low Load Operation Range Extension by Autothermal On-Board Syngas Generation
(The American Society of Mechanical Engineers (ASME), 2019)Volatile renewable energy sources induce power supply fluctuations. These need to be compensated by flexible conventional power plants. Gas turbines in combined cycle power plants adjust the power output quickly but their ... -
High-Fidelity Sensitivity Analysis of Modal Properties of Mistuned Bladed Disks Regarding Material Anisotropy
(The American Society of Mechanical Engineers (ASME), 2019)A new method has been developed for sensitivity calculations of modal characteristics of bladed disks made of anisotropic materials. The method allows the determination of the sensitivity of the natural frequencies and ... -
Analytical Heat Transfer Correlation for a Multistage Steam Turbine in Warm-Keeping Operation With Air
(The American Society of Mechanical Engineers (ASME), 2019)Due to the growing share of volatile renewable power generation, conventional power plants with a high flexibility are required. This leads to high thermal stresses inside the heavy components which reduces the lifetime. ... -
Gas Turbine Fouling Tests: Review, Critical Analysis, and Particle Impact Behavior Map
(The American Society of Mechanical Engineers (ASME), 2019)Fouling affects gas turbine operation, and airborne or fuel contaminants, under certain conditions, become very likely to adhere to surfaces if impact takes place. Particle sticking implies the change in shape in terms of ... -
Effects of CO2 Addition on the Turbulent Flame Front Dynamics and Propagation Speeds of Methane/Air Mixtures
(The American Society of Mechanical Engineers (ASME), 2019)Exhaust gas recirculation (EGR) is one of the most promising methods of improving the performance of power-generating gas turbines. CO2 is known to have the largest impact on flame behavior of any major exhaust species, ... -
Modeling and Control of Combustion Phasing in Dual-Fuel Compression Ignition Engines
(The American Society of Mechanical Engineers (ASME), 2019)Dual-fuel engines can achieve high efficiencies and low emissions but also can encounter high cylinder-to-cylinder variations on multicylinder engines. In order to avoid these variations, they require a more complex method ... -
Modeling and Control of a Diesel Engine With Regenerative Hydraulic-Assisted Turbocharger
(The American Society of Mechanical Engineers (ASME), 2019)Diesel engines are of great challenges due to stringent emission and fuel economy requirements. Compared with the conventional turbocharger system, regenerative assisted system provides additional degrees-of-freedom for ... -
Engine-Scalable Rotor Casing Convective Heat Flux Evaluation Using Inverse Heat Transfer Methods
(The American Society of Mechanical Engineers (ASME), 2019)In this paper, we propose a two-step methodology to evaluate the convective heat flux along the rotor casing using an engine-scalable approach based on discrete Green's functions . The first step consists in the use of an ... -
Benchmark of a Novel Aero-Elastic Simulation Code for Small Scale VAWT Analysis
(The American Society of Mechanical Engineers (ASME), 2019)After almost 20 years of absence from research agendas, interest in the vertical axis wind turbine (VAWT) technology is presently increasing again, after the research stalled in the mid 90's in favor of horizontal axis ... -
Aeromechanical Response of a Distortion-Tolerant Boundary Layer Ingesting Fan
(The American Society of Mechanical Engineers (ASME), 2019)Boundary layer ingestion (BLI) is a propulsion technology being investigated at NASA by the Advanced Aircraft Transportation Technology (AATT) Program to facilitate a substantial reduction in aircraft fuel burn. In an ... -
Mission Analysis and Operational Optimization of Adaptive Cycle Microturbofan Engine in Surveillance and Firefighting Scenarios
(The American Society of Mechanical Engineers (ASME), 2019)The current work focuses on mission-based evaluation of a novel engine architecture arising from the conversion of a microturbojet to a microturbofan via introduction of a variable speed fan and bypass nozzle. The solution ... -
Improved Modeling Capabilities of the Airflow Within Turbine Case Cooling Systems Using Smart Porous Media
(The American Society of Mechanical Engineers (ASME), 2019)Impingement cooling is commonly employed in gas turbines to control the turbine tip clearance. During the design phase, computational fluid dynamics (CFD) is an effective way of evaluating such systems but for most turbine ... -
Effect of Prior Creep Strain on High Cycle Fatigue Life of TI 834
(The American Society of Mechanical Engineers (ASME), 2019)Room-temperature fatigue tests were conducted on Ti 834 with prior creep strains accumulated under constant load at 550 °C and 600 °C, respectively. Microstructural and fractographic examinations on specimens with prior ... -
Rotordynamic Characterization of a Staggered Labyrinth Seal: Experimental Test Data and Comparison With Predictions
(The American Society of Mechanical Engineers (ASME), 2019)As well known, the stability assessment of turbomachines is strongly related to internal sealing components. For instance, labyrinth seals are widely used in compressors, steam, and gas turbines and pumps to control the ... -
Forced Response Reduction of a Blisk by Means of Intentional Mistuning
(The American Society of Mechanical Engineers (ASME), 2019)The effect of intentional mistuning has been analyzed for an axial turbocharger blisk with the objective of limiting the forced response due to low engine order excitation (LEO). The idea behind the approach was to increase ... -
Multiphase Computational Fluid Dynamics Modeling of External Oil Flow From a Journal Bearing
(The American Society of Mechanical Engineers (ASME), 2019)High loads and bearing life requirements make journal bearings a potential choice for use in high power, epicyclic gearboxes in jet engines. Particularly, in a planetary configuration, the kinematic conditions are complex. ...