Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 4921-4940 of 9564
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On Nonlinear Rotor Dynamic Effects of Aerodynamic Bearings With Simple Flexible Rotors
(The American Society of Mechanical Engineers (ASME), 2008)The last decades have experienced a growing enhancement of aeronautical oil free turbomachinery. The classical linear approach of rotor dynamics commonly uses stiffness and damping coefficients ... -
Heavily Loaded Gas Foil Bearings: A Model Anchored to Test Data
(The American Society of Mechanical Engineers (ASME), 2008)Widespread usage of gas foil bearings (FBs) into microturbomachinery to midsize gas turbine engines requires accurate performance predictions anchored to reliable test data. This paper presents a ... -
Improved High Cycle Fatigue Damage Tolerance of Turbine-Engine Compressor Components by Low Plasticity Burnishing
(The American Society of Mechanical Engineers (ASME), 2008)Significant progress has been made in the application of low plasticity burnishing (LPB) technology to military engine components, leading to orders of magnitude improvement in damage tolerance. ... -
Numerical and Experimental Damping Assessment of a Thin-Walled Friction Damper in the Rotating Setup With High Pressure Turbine Blades
(The American Society of Mechanical Engineers (ASME), 2008)Underplatform friction dampers are possible solutions for minimizing vibrations of rotating turbine blades. Solid dampers, characterized by their compact dimensions, are frequently used in real ... -
Nonlocal Cyclic Life Prediction for Gas Turbine Components With Sharply Notched Geometries
(The American Society of Mechanical Engineers (ASME), 2008)The safe and efficient operation of modern heavy duty gas turbines requires a reliable prediction of fatigue behavior of turbine components. Fatigue damage is located in areas where cyclic ... -
The Effect of Initial Injection Conditions on the Oil Droplet Motion in a Simplified Bearing Chamber
(The American Society of Mechanical Engineers (ASME), 2008)Increasing demands on aeroengines to operate at higher shaft speeds and temperatures require an understanding and optimization of the integral systems. The ability to model movement of oil around ... -
A Design to Improve the Effective Damping Characteristics of Hole-Pattern-Stator Annular Gas Seals
(The American Society of Mechanical Engineers (ASME), 2008)Predictions are presented for hole-pattern-stator seals for which the hole depth is varied axially, showing that various depth patterns can significantly improve damping performance in terms of ... -
Evaluation of Flow Behavior for Clearance Brush Seals
(The American Society of Mechanical Engineers (ASME), 2008)The industrial applications of brush seals have been increasing due to their superior sealing performance. Advances in the understanding of seal behavior have been pushing the design limits to ... -
Comparison of Recuperator Alloy Degradation in Laboratory and Engine Testing
(The American Society of Mechanical Engineers (ASME), 2008)In order to increase the efficiency of advanced microturbines, durable alloy foils are needed for their recuperators to operate at 650–700°C. Prior work has demonstrated that water vapor ... -
Application of a Computational Code to Simulate Interstage Injection Effects on GE Frame 7EA Gas Turbine
(The American Society of Mechanical Engineers (ASME), 2008)This paper investigates effects of interstage water injection on the performance of a GE Frame 7EA gas turbine using aerothermodynamic modeling. To accomplish this objective, a computational code, ... -
Study and Field Tests of the Novel Low Pressure Fogger System for Industrial Gas Turbine
(The American Society of Mechanical Engineers (ASME), 2008)Based on three patented innovations (air-assist atomizer, wetness sensor, and closed loop programmable logic controller (PLC)), a new low-pressure power gas turbine augmentation system was developed. ... -
A Novel Free-Cooling Scheme for Combustion Turbine Inlet Air Cooling
(The American Society of Mechanical Engineers (ASME), 2008)Free cooling is a well-known concept in the HVAC industry in which the cold water produced by a cooling tower is used directly to satisfy the requirement of the cooling load without assistance ... -
Development and Validation of a Computational Code for Wet Compression Simulation of Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2008)In this paper, a calculation code, developed in house by the authors, able to evaluate the performance of a gas turbine with all possible fogging strategies (high pressure fogging, overspray, ... -
An Iterative Method for Blade Profile Loss Model Adaptation Using Streamline Curvature
(The American Society of Mechanical Engineers (ASME), 2008)The various incidence, deviation, and loss models used in through-flow analysis methods, such as streamline curvature, are nothing more than statistical curve fits. A closer look at public domain ... -
Calculations of Cooled Turbine Efficiency
(The American Society of Mechanical Engineers (ASME), 2008)The efficiency of a cooled turbine stage has been discussed in the literature. All proposed definitions compare the actual power output with an ideal output, which has to be determined; but ... -
Experimental Investigation of the Stability Mechanism and Emissions of a Lifted Swirl Nonpremixed Flame
(The American Society of Mechanical Engineers (ASME), 2008)We report on the experimental investigation of a confined lifted swirl nonpremixed flame by applying a novel Airblast nozzle (, , 2005, Fuel Injection Apparatus, Patent No. DE 10 2005 022 ... -
Design Concept for Large Output Graz Cycle Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2008)The introduction of closed cycle gas turbines with their capability of retaining combustion generated CO2 can offer a valuable contribution to the Kyoto goal and to future power generation. ... -
Impact of Ethane, Propane, and Diluent Content in Natural Gas on the Performance of a Commercial Microturbine Generator
(The American Society of Mechanical Engineers (ASME), 2008)The impact of fuel composition on the performance of power generation devices is gaining interest as the desire to diversify fuel supplies increases. In the present study, measurements of ... -
Effect of Fuel System Impedance Mismatch on Combustion Dynamics
(The American Society of Mechanical Engineers (ASME), 2008)Combustion dynamics are a challenging problem in the design and operation of premixed gas turbine combustors. In premixed combustors, pressure oscillations created by the flame dynamic response ... -
Fuel Flexibility Influences on Premixed Combustor Blowout, Flashback, Autoignition, and Stability
(The American Society of Mechanical Engineers (ASME), 2008)This paper addresses the impact of fuel composition on the operability of lean premixed gas turbine combustors. This is an issue of current importance due to variability in the composition of ...