Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2181-2200 of 9564
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Numerical and Experimental Investigations on Preload Effects in Air Foil Journal Bearings
(The American Society of Mechanical Engineers (ASME), 2018)A detailed elastogasdynamic model of a preloaded three-pad air foil journal bearing is presented. Bump and top foil deflections are herein calculated with a nonlinear beamshell theory according to Reissner. The two-dimensional ... -
Computational Fluid Dynamics Investigation of a Core-Mounted Target-Type Thrust Reverser—Part 1: Reverser Stowed Configuration
(The American Society of Mechanical Engineers (ASME), 2018)During the second half of the 90 s, NASA performed experimental investigations on six novel thrust reverser (TR) designs; core-mounted target-type thrust reverser (CMTTTR) design is one of them. To assess the CMTTTR ... -
A Numerical Study of Ethanol–Water Droplet Evaporation
(The American Society of Mechanical Engineers (ASME), 2018)The present effort focuses on detailed numerical modeling of the evaporation of an ethanol–water droplet. The model intends to capture all relevant details of the process: it includes species and heat transport in the ... -
Effects of Nozzle Helmholtz Number on Indirect Combustion Noise by Compositional Perturbations
(The American Society of Mechanical Engineers (ASME), 2018)By modeling a multicomponent gas, a new source of indirect combustion noise is identified, which is named compositional indirect noise. The advection of mixture inhomogeneities exiting the gas-turbine combustion chamber ... -
Characterization of Different Actuator Designs for the Control of the Precessing Vortex Core in a Swirl-Stabilized Combustor
(The American Society of Mechanical Engineers (ASME), 2018)The precessing vortex core (PVC) represents a helical-shaped coherent flow structure typically occurring in both reacting and nonreacting swirling flows. Until now, the fundamental impact of the PVC on flame dynamics, ... -
Design of Directional Probes for High-Frequency Turbine Measurements
(The American Society of Mechanical Engineers (ASME), 2018)Aerodynamic probes are prevalent in turbomachinery research and gas turbine monitoring. Regrettably, this measurement technique experiences limitations not only in the transonic range but also in the high frequency range. ... -
Testing of a Novel Post Combustion Acid Removal Process for the Direct-Fired, Oxy-Combustion Allam Cycle Power Generation System
(The American Society of Mechanical Engineers (ASME), 2018)The Allam Cycle is a high-performance oxy-fuel, supercritical CO2 power cycle that offers significant benefits over traditional fossil and hydrocarbon fuel-based power generation systems. A major benefit arises in the ... -
Measurements of the Rotordynamic Response of a Rotor Supported on Porous Type Gas Bearing
(The American Society of Mechanical Engineers (ASME), 2018)A test rig is built in this study to measure the rotordynamic response of a rotor supported on porous-type gas bearings. A rotor with a double impulse turbine at one end is driven by compressed air and supported on two ... -
Experimental Investigation on Infrared Signatures of Axisymmetric Vectoring Exhaust Nozzle With Film Cooling and Low-Emissivity Coating
(The American Society of Mechanical Engineers (ASME), 2018)Investigations on infrared (IR) radiation suppression of axisymmetric vectoring exhaust nozzle (AVEN) are meaningful, due to the requests for maneuverability and IR stealth capability of aircrafts. In this paper, the ... -
Long-Term NOx Emission Behavior of Heavy Duty Gas Turbines: An Approach for Model-Based Monitoring and Diagnostics
(The American Society of Mechanical Engineers (ASME), 2018)Accurate monitoring of gas turbine performance is a means to an early detection of performance deviation from the design point and thus to an optimized operational control. In this process, the diagnosis of the combustion ... -
The Development and Mechanisms of the High Pressure Turbine Vane Wake Vortex
(The American Society of Mechanical Engineers (ASME), 2018)The wake vortex is an important origin of unsteadiness and losses in turbines. In this paper, the development and underlying mechanisms of the shedding vortex of a high-pressure transonic turbine vane are studied and ... -
Double Wall Cooling of a Full-Coverage Effusion Plate, Including Internal Impingement Array Cooling
(The American Society of Mechanical Engineers (ASME), 2018)New experimental data are provided for full-coverage effusion cooling and impingement array cooling, as applied simultaneously onto the respective external and internal surfaces of a single instrumented test plate. For the ... -
Using Dynamic Simulation to Evaluate Attemperator Operation in a Natural Gas Combined Cycle With Duct Burners in the Heat Recovery Steam Generator
(The American Society of Mechanical Engineers (ASME), 2018)A generic training simulator of a natural gas combined cycle (NGCC) was modified to match operations at a real plant. The objective was to use the simulator to analyze cycling operations of the plant. Initial operation of ... -
Numerical Investigation on the Leakage and Static Stability Characteristics of Pocket Damper Seals at High Eccentricity Ratios
(The American Society of Mechanical Engineers (ASME), 2018)Annular gas seals for compressors and turbines are designed to operate in a nominally centered position in which the rotor and stator are at concentric condition, but due to the rotor–stator misalignment or flexible rotor ... -
A Numerical Investigation on NO2 Formation in a Natural Gas–Diesel Dual Fuel Engine
(The American Society of Mechanical Engineers (ASME), 2018)This research numerically simulates the formation and destruction of nitrogen dioxide (NO2) in a natural gas (NG)–diesel dual fuel engine using commercial CFD software converge coupled with a reduced primary reference fuel ... -
Comparison of Diesel Engine Efficiency and Combustion Characteristics Between Different Bore Engines
(The American Society of Mechanical Engineers (ASME), 2018)This study investigates the effects of engine bore size on diesel engine performance and combustion characteristics, including in-cylinder pressure, ignition delay, burn duration, and fuel conversion efficiency, using ... -
Experimental and Numerical Investigations of Closed Radial Inflow Turbine With Labyrinth Seals
(The American Society of Mechanical Engineers (ASME), 2018)It is a common practice to use closed impeller in radial inflow turbine against the flow leakage from tip clearance of impellers, especially in small volume flow condition. It utilizes labyrinths between the shroud and the ... -
An Investigation of the Combustion Process of a Heavy-Duty Natural Gas-Diesel Dual Fuel Engine
(The American Society of Mechanical Engineers (ASME), 2018)This paper investigates the effect of the addition of natural gas (NG) and engine load on the cylinder pressure, combustion process, brake thermal efficiency, and methane combustion efficiency of a heavy-duty NG-diesel ... -
An Experimental Investigation on the Combustion Process of a Simulated Turbocharged Spark Ignition Natural Gas Engine Operated on Stoichiometric Mixture
(The American Society of Mechanical Engineers (ASME), 2018)This research investigated the combustion process of an AVL Model LEF/Volvo 5312 single cylinder engine configured to simulate the operation of a heavy-duty spark ignition (SI) natural gas (NG) engine operated on stoichiometric ... -
Measurements and Modeling of the Dynamic Response of a Pilot Stabilized Premixed Flame Under Dual-Input Perturbation
(The American Society of Mechanical Engineers (ASME), 2018)Pilot flames have been widely used for flame stabilization in low-emission gas turbine combustors. Effects of pilot flame on dynamic instabilities, however, are not well understood. In this work, the dynamic interactions ...