Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 4121-4140 of 9564
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Development of a Postprocessing Methodology for Studying Thermal Stratification in an HCCI Engine
(The American Society of Mechanical Engineers (ASME), 2012)Naturally occurring thermal stratification significantly impacts the characteristics of homogeneous charge compression ignition (HCCI) combustion. The in-cylinder gas temperature distributions prior ... -
Effect of Cooling Flow on the Operation of a Hot Rotor-Gas Foil Bearing System
(The American Society of Mechanical Engineers (ASME), 2012)Gas foil bearings (GFBs) operating at high temperature rely on thermal management procedures that supply needed cooling flow streams to keep the bearing and rotor from overheating. Poor thermal ... -
Combustion Performance in a Semiclosed Cycle Gas Turbine for IGCC Fired With CO-Rich Syngas and Oxy-Recirculated Exhaust Streams
(The American Society of Mechanical Engineers (ASME), 2012)Our study found that burning a CO-rich gasified coal fuel, derived from an oxygen–CO2 blown gasifier, with oxygen under stoichiometric conditions in a closed cycle gas turbine produced a ... -
Tension-Compression Fatigue of a SiC/SiC Ceramic Matrix Composite at Elevated Temperature
(The American Society of Mechanical Engineers (ASME), 2012)Tension-compression fatigue behavior of a nonoxide ceramic composite with a multilayered matrix was investigated at 1200 °C in laboratory air. The composite was produced via chemical vapor ... -
On the Effect of Thermal Energy Transport to the Performance of (Semi) Floating Ring Bearing Systems for Automotive Turbochargers
(The American Society of Mechanical Engineers (ASME), 2012)Bearing systems in engine-oil lubricated turbochargers (TCs) must operate reliably over a wide range of shaft speeds and withstand severe axial and radial thermal gradients. An engineered thermal ... -
Coupled Fluid-Structure Transient Thermal Analysis of a Gas Turbine Internal Air System With Multiple Cavities
(The American Society of Mechanical Engineers (ASME), 2012)This paper presents the transient aerothermal analysis of a gas turbine internal air system through an engine flight cycle featuring multiple fluid cavities that surround a HP turbine disk and ... -
Experimental and Numerical Investigations on the Leakage Flow Characteristics of the Labyrinth Brush Seal
(The American Society of Mechanical Engineers (ASME), 2012)The leakage rate of the labyrinth brush seal was experimentally measured and numerically investigated in this paper. Four different rotational speeds of 0, 1500, 2400 and 3000 rpm were utilized ... -
Investigations on the Rotordynamic Coefficients of Pocket Damper Seals Using the Multifrequency, One-Dimensional, Whirling Orbit Model and RANS Solutions
(The American Society of Mechanical Engineers (ASME), 2012)The numerical approach using the multifrequency one-dimensional whirling orbit model and Reynolds-averaged Navier-Stokes (RANS) solution was proposed for prediction of rotordynamic coefficients of ... -
Contribution to the Modeling and Understanding of Cold Pulsating Flow Influence in the Efficiency of Small Radial Turbines for Turbochargers
(The American Society of Mechanical Engineers (ASME), 2012)In the present paper, an unsteady approach to determine the performance of a small radial inflow turbine working under cold pulsating flow is presented. It has been concluded that a reasonably ... -
Effects of Bending Moments and Pretightening Forces on the Flexural Stiffness of Contact Interfaces in Rod-Fastened Rotors
(The American Society of Mechanical Engineers (ASME), 2012)The rod-fastened rotor (RFR) is comprised of a series of discs clamped together by a central tie rod or several tie rods on the pitch circle diameter. The equivalent flexural stiffness of ... -
Analytical Correction of Nonlinear Thermal Stresses Under Thermomechanical Cyclic Loadings
(The American Society of Mechanical Engineers (ASME), 2012)Automotive turbocharger components frequently experience complex thermomechanical fatigue (TMF) loadings which require estimation of nonlinear plastic stresses for fatigue life calculations. These ... -
An Energy-Based Axial Isothermal-Mechanical Fatigue Lifing Method
(The American Society of Mechanical Engineers (ASME), 2012)An energy-based fatigue lifing method for the determination of the full-life and critical-life of in-service structures subjected to axial isothermal-mechanical fatigue (IMF) has been developed. ... -
Damping and Inertia Coefficients for Two Open Ends Squeeze Film Dampers With a Central Groove: Measurements and Predictions
(The American Society of Mechanical Engineers (ASME), 2012)Aircraft engine rotors are particularly sensitive to rotor imbalance and sudden maneuver loads, since they are always supported on rolling element bearings with little damping. Most engines ... -
Development and Validation of a Three-Dimensional Multiphase Flow Computational Fluid Dynamics Analysis for Journal Bearings in Steam and Heavy Duty Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2012)The traditional method for hydrodynamic journal bearing analysis usually applies the lubrication theory based on the Reynolds equation and suitable empirical modifications to cover turbulence, heat ... -
Effects of Manufacturing Noise on Microturbine Centrifugal Impeller Performance
(The American Society of Mechanical Engineers (ASME), 2012)This paper presents a study on a small centrifugal impeller for microturbine application from a manufacturing perspective. The aim is to analyze the impact of geometric deviations on part ... -
A Metal Mesh Foil Bearing and a Bump-Type Foil Bearing: Comparison of Performance for Two Similar Size Gas Bearings
(The American Society of Mechanical Engineers (ASME), 2012)Gas bearings in oil-free microturbomachinery for gas process applications and power generation (<400 kW) must be reliable and inexpensive, ensuring low drag power and thermal stability. Bump-type ... -
Performance Evaluation of the Integration Between a Thermo–Photo–Voltaic Generator and an Organic Rankine Cycle
(The American Society of Mechanical Engineers (ASME), 2012)The present study deals with the integration between a thermo-photo-voltaic generator (TPV) and an organic Rankine cycle (ORC), named here TORCIS (thermo-photo-voltaic organic Rankine cycle integrated ... -
Available and Future Gas Turbine Power Augmentation Technologies: Techno-Economic Analysis in Selected Climatic Conditions
(The American Society of Mechanical Engineers (ASME), 2012)There exists a widespread interest in the application of gas turbine power augmentation technologies in both electric power generation and mechanical drive markets, attributable to deregulation ... -
Studying the Stabilization Dynamics of Swirling Partially Premixed Flames by Proper Orthogonal Decomposition
(The American Society of Mechanical Engineers (ASME), 2012)Environmental regulations are continuously pushing lower emissions with an impact on the combustion process in gas turbines (GTs). As a consequence, GT combustors operate in very lean regimes ... -
In-Situ Continuous Coke Deposit Removal by Catalytic Steam Gasification for Fuel-Cooled Thermal Management
(The American Society of Mechanical Engineers (ASME), 2012)Fuel-cooled thermal management, including endothermic cracking and reforming of hydrocarbon fuels, is an enabling technology for advanced aero engines and offers potential for cycle improvements ...