Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2561-2580 of 9564
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Structural Deflection's Impact in Turbine Stator Well Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2017)In the most evolved designs, it is common practice to expose engine components to main annulus air temperatures exceeding the thermal material limit in order to increase the overall performance and to minimize the ... -
Effect of Operating Conditions on the Elastohydrodynamic Performance of Foil Thrust Bearings for Supercritical CO2 Cycles
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, a quasi-three-dimensional fluid–structure model using computational fluid dynamics for the fluid phase is presented to study the elastohydrodynamic performance of foil thrust bearings for supercritical CO2 ... -
On the Interaction of Multiple Traveling Wave Modes in the Flutter Vibrations of Friction-Damped Tuned Bladed Disks
(The American Society of Mechanical Engineers (ASME), 2017)It is well-known that flutter vibrations of bladed disks can be saturated by dry friction. Previous theoretical investigations indicated that the steady-state, friction-damped flutter vibrations of tuned bladed disks are ... -
Emissions of a Wet Premixed Flame of Natural Gas and a Mixture With Hydrogen at High Pressure
(The American Society of Mechanical Engineers (ASME), 2017)It is generally accepted that combustion of hydrogen and natural gas mixtures will become more prevalent in the near future, to allow for a further penetration of renewables in the European power generation system. The ... -
Flame Holding in the Premixing Zone of a Gas Turbine Model Combustor After Forced Ignition of H2–Natural Gas–Air Mixtures
(The American Society of Mechanical Engineers (ASME), 2017)Flashback (FB) and self-ignition in the premixing zone of typical gas turbine swirl combustors in lean premixed operation are immanent risks and can lead to damage and failure of components. Thus, steady combustion in the ... -
Dynamical Properties of Combustion Instability in a Laboratory-Scale Gas-Turbine Model Combustor
(The American Society of Mechanical Engineers (ASME), 2017)We present an experimental study on the nonlinear dynamics of combustion instability in a lean premixed gas-turbine model combustor with a swirl-stabilized turbulent flame. Intermittent combustion oscillations switching ... -
Application of Artificial Neural Networks for Misfiring Detection in an Annular Pulsed Detonation Combustor Mockup
(The American Society of Mechanical Engineers (ASME), 2017)An annular pulsed detonation combustor (PDC) basically consists of a number of detonation tubes which are firing in a predetermined sequence into a common downstream annular plenum. Fluctuating initial conditions and ... -
Linear Growth Rate Estimation From Dynamics and Statistics of Acoustic Signal Envelope in Turbulent Combustors
(The American Society of Mechanical Engineers (ASME), 2017)Considerable research and development efforts are required to meet the targets of future gas turbine technologies in terms of performance, emissions, and operational flexibility. One of the recurring problems is the ... -
Short Helical Combustor: Dynamic Flow Analysis in a Combustion System With Angular Air Supply
(The American Society of Mechanical Engineers (ASME), 2017)A novel gas turbine combustor is investigated by means of a global flow analysis. Its main feature is the helical arrangement of the burners, which allows the utilization of the high angular momentum of the flow from ... -
Predicting Flashback Limits of a Gas Turbine Model Combustor Based on Velocity and Fuel Concentration for H2–Air Mixtures
(The American Society of Mechanical Engineers (ASME), 2017)This study investigates the influence of the fuel injection strategy on safety against flashback in a gas turbine model combustor with premixing of H2–air mixtures. The flashback propensity is quantified and the flashback ... -
Validation of Surface Temperature Measurements on a Combustor Liner Under Full-Load Conditions Using a Novel Thermal History Paint
(The American Society of Mechanical Engineers (ASME), 2017)The ever-increasing requirements on gas turbine efficiency and the simultaneous demand for reduced emissions, necessitate much more accurate calculations of the combustion process and combustor wall temperatures. Thermal ... -
Application of a Turbulent Jet Flame Flashback Propensity Model to a Commercial Gas Turbine Combustor
(The American Society of Mechanical Engineers (ASME), 2017)Because flashback is a key operability issue associated with low emission combustion of high hydrogen content fuels, design tools to predict flashback propensity are of interest. Such a design tool has been developed by ... -
Effect of Aft Rotor on the Inter-Rotor Flow of an Open Rotor Propulsion System
(The American Society of Mechanical Engineers (ASME), 2017)The effects of the aft rotor on the inter-rotor flow field of an open rotor propulsion rig (ORPR) were examined. A particle image velocimetry (PIV) dataset that was acquired phase locked to the front rotor position has ... -
An Acoustic Time-of-Flight Approach for Unsteady Temperature Measurements: Characterization of Entropy Waves in a Model Gas Turbine Combustor
(The American Society of Mechanical Engineers (ASME), 2017)Lean premixed combustion promotes the occurrence of thermoacoustic phenomena in gas turbine combustors. One mechanism that contributes to the flame–acoustic interaction is entropy noise. Fluctuations of the equivalence ... -
Externally Fired Micro-Gas Turbine and Organic Rankine Cycle Bottoming Cycle: Optimal Biomass/Natural Gas Combined Heat and Power Generation Configuration for Residential Energy Demand
(The American Society of Mechanical Engineers (ASME), 2017)Small-scale combined heat and power (CHP) plants present lower electric efficiency in comparison to large scale ones, and this is particularly true when biomass fuels are used. In most cases, the use of both heat and ... -
Low Frequency Distortion in Civil Aero-engine Intake
(The American Society of Mechanical Engineers (ASME), 2017)The main role of the intake is to provide a sufficient mass flow to the engine face and a sufficient flow homogeneity to the fan. Intake-fan interaction off design represents a critical issue in the design process because ... -
Fan–Intake Interaction Under High Incidence
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, we present an extensive numerical study on the interaction between the downstream fan and the flow separating over an intake under high incidence. The objectives of this investigation are twofold: (a) to ... -
Potential of Retrofit Passive Flow Control for Small Horizontal Axis Wind Turbines
(The American Society of Mechanical Engineers (ASME), 2017)The present paper analyzes the effect of passive flow control (PFC) with respect to the retrofitting on small horizontal axis wind turbines (sHAWTs). We conducted extensive wind tunnel studies on a high performance low ... -
Experimental Evaluation of Compressor Blade Fouling
(The American Society of Mechanical Engineers (ASME), 2017)Fouling of compressor blades is an important mechanism leading to performance deterioration in gas turbines over time. Experimental and simulation data are available for the impact of specified amounts of fouling on the ... -
Brush Seal Frictional Heat Generation—Test Rig Design and Validation Under Steam Environment
(The American Society of Mechanical Engineers (ASME), 2017)Sealing technology is a key feature to improve efficiency of steam turbines for both new power stations and modernization projects. One of the most powerful sealing alternatives for reducing parasitic leakages in the blade ...