Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2881-2900 of 9564
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Wake Analysis of a Finite Width Gurney Flap
(The American Society of Mechanical Engineers (ASME), 2016)The results of stereo particleimagevelocimetry (PIV) measurements are presented in this paper to gain further insight into the wake of a finite width Gurney flap. It is attached to an FX 63137 airfoil which is known for a ... -
Differential Expansion Sensitivity Studies During Steam Turbine Startup
(The American Society of Mechanical Engineers (ASME), 2016)In order to improve the startup flexibility of steam turbines, it becomes relevant to analyze their dynamic thermal behavior. In this work, the relative expansion between rotor and casing was studied during coldstart ... -
Flame Area Fluctuation Measurements in Velocity Forced Premixed Gas Turbine Flames
(The American Society of Mechanical Engineers (ASME), 2016)Fluctuations in the heat release rate that occur during unstable combustion in leanpremixed gas turbine combustors can be attributed to velocity and equivalence ratio fluctuations. For a fully premixed flame, velocity ... -
Three Dimensional Blade Stacking Strategies and Understanding of Flow Physics in Low Pressure Steam Turbines—Part II: Stacking Equivalence and Differentiators
(The American Society of Mechanical Engineers (ASME), 2016)Optimization of blade stacking in lowpressure (LP) steam turbine development constitutes one of the most delicate and timeconsuming parts of the design process. This is the second part of two papers focusing on stacking ... -
A Dynamic Reliability Centered Maintenance Analysis Method for Natural Gas Compressor Station Based on Diagnostic and Prognostic Technology
(The American Society of Mechanical Engineers (ASME), 2016)The availability requirement of natural gas compressors is high. Thus, current maintenance architecture, combined periodical maintenance and simple condition based maintenance, should be improved. In this paper, a new ... -
Two Phase Flow Pressure Drop in Corrugated Tubes Used in an Aero engine Oil System
(The American Society of Mechanical Engineers (ASME), 2016)In modern aeroengines, the lubrication system holds a key role due to the demand for high reliability standards. An aeroengine bearing chamber contains components like bearings and gears. Oil is used for lubrication and ... -
Online Prediction of Temperature and Stress in Steam Turbine Components Using Neural Networks
(The American Society of Mechanical Engineers (ASME), 2016)Considered here are nonlinear autoregressive neural networks (NETs) with exogenous inputs (NARX) as a mathematical model of a steam turbine rotor used for the online prediction of turbine temperature and stress. In this ... -
Scaling of Gas Turbine From Air to Refrigerants for Organic Rankine Cycle Using Similarity Concept
(The American Society of Mechanical Engineers (ASME), 2016)Similitude, or similarity concept, is an essential concept in turbomachinery to allow the designer to scale a turbine design to different sizes or different working fluids without repeating the whole design and development ... -
Compliant Gas Foil Bearings and Analysis Tools
(The American Society of Mechanical Engineers (ASME), 2016)Compliant gas foil bearings are composed of two layers of thin metallic foil and a thin film of gas to support the journal. The bottom foil creates an elastic structure which supports the top foil. This support structure ... -
Fuel Efficiency Optimization for a Divided Exhaust Period Regulated Two Stage Downsized Spark Ignition Engine
(The American Society of Mechanical Engineers (ASME), 2016)In our previous paper, a new gas exchange concept termed divided exhaust period regulated twostage (DEP R2S) system has been proposed. In this system, two exhaust valves in each cylinder are separately functioned with one ... -
The Effects of Tip Leakage Flow on the Performance of Multistage Compressors Used in Small Core Engine Applications
(The American Society of Mechanical Engineers (ASME), 2016)Large rotor tip clearances and the associated tip leakage flows are known to have a significant effect on overall compressor performance. However, detailed experimental data reflecting these effects for a multistage ... -
Testing and Modeling of an Acoustic Instability in Pilot Operated Pressure Relief Valves
(The American Society of Mechanical Engineers (ASME), 2016)Pressure relief valves (PRVs) are included as an essential element of many compressor piping systems in order to prevent overpressurization and also to minimize the loss of process gas during relief events. Failure of the ... -
Impact of Swirl Flow on Combustor Liner Heat Transfer and Cooling: A Numerical Investigation With Hybrid Reynolds Averaged Navier–Stokes Large Eddy Simulation Models
(The American Society of Mechanical Engineers (ASME), 2016)This paper reports the main findings of a numerical investigation aimed at characterizing the flow field and the wall heat transfer resulting from the interaction of a swirling flow provided by leanburn injectors and a ... -
Design Considerations of Rotor Cone Angle for Downwind Wind Turbines
(The American Society of Mechanical Engineers (ASME), 2016)Due to their potential to use light, flexible blades, downwind turbines are well suited for offshore floating platforms, for which there is a need to substantially lower the cost of windgenerated electricity. However, ... -
Enhancing Low Temperature Combustion With Biodiesel Blending in a Diesel Engine at a Medium Load Condition
(The American Society of Mechanical Engineers (ASME), 2016)The present study investigated the effects of biodiesel blending under a wide range of intake oxygen concentration levels in a diesel engine. This study attempted to identify the lowest biodiesel blending rate that achieves ... -
Feedback Control of Self Sustained Nonlinear Combustion Oscillations
(The American Society of Mechanical Engineers (ASME), 2016)Detrimental combustion instability is unwanted in gas turbines, aeroengines, rocket motors, and many other combustion systems. In this work, we design and implement a sliding mode controller (SMC) to mitigate selfsustained ... -
Discussion: “Environmental Effects on the High-Temperature Corrosion of Superalloys in Present and Future Gas Turbines” (Lee, S. Y., Young, W. E., and Hussey, C. E., 1972, ASME J. Eng. Power, 94, pp. 149–153)
(The American Society of Mechanical Engineers (ASME), 1972) -
NOx Emissions Modeling and Uncertainty From Exhaust Gas Diluted Flames
(The American Society of Mechanical Engineers (ASME), 2016)Oxides of nitrogen (NOx) are pollutants emitted by combustion processes during power generation and transportation that are subject to increasingly stringent regulations due to their impact on human health and the environment. ... -
Bayesian Calibration for Power Splitting in Single Shaft Combined Cycle Plant Diagnostics
(The American Society of Mechanical Engineers (ASME), 2016)Condition monitoring and diagnostics of a combined cycle gas turbine (CCGT) power plant has become an important tool to improve its availability, reliability, and performance. However, there are two major challenges in the ... -
Brush Seal Structural Analysis and Correlation With Tests for Turbine Conditions
(The American Society of Mechanical Engineers (ASME), 2016)Bristle tip contact forces and resulting stress levels under engine conditions are critical for optimizing brush seal performance as well as for achieving operational safety. Literature survey reveals the lack of test data ...