Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2521-2540 of 9564
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Dynamics of Slant Cracked Rotor for a Steam Turbine Generator System
(The American Society of Mechanical Engineers (ASME), 2017)Root causes of several recent crack failures in turbine units are attributed to oscillation and interaction between generator of turbine unit and devices on the grid, where torsional vibration of the rotor bearing system ... -
A Taylor Series Expansion Approach for Nonlinear Blade Forced Response Prediction Considering Variable Rotational Speed
(The American Society of Mechanical Engineers (ASME), 2017)In the field of turbomachinery, great efforts are made to enhance computational tools to obtain reliable predictions of the vibrational behavior of friction-damped bladed disks. As a trade-off between computational burden ... -
Numerical Analysis of Energy Flow Paths in Exhaust Gas Turbochargers by Means of Conjugate Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2017)Heat transfer effects play a significant role in assessing the performance of automotive turbochargers. Thermal effects are becoming increasingly relevant due to reduced machine sizes and increased exhaust gas temperatures. ... -
Swirl Flame Response to Simultaneous Axial and Transverse Velocity Fluctuations
(The American Society of Mechanical Engineers (ASME), 2017)In this experimental study, we investigate the impact of transverse acoustic velocity fluctuations on flame response to axial velocity fluctuations. Such a scenario where a flame is under the influence of a 2D acoustic ... -
Assessment of Solar Gas Turbine Hybridization Schemes
(The American Society of Mechanical Engineers (ASME), 2017)A simulation environment allowing steady state and transient modeling is used for assessing several gas turbine based cycles proposed for solar hybridization. First, representative open cycle gas turbine configurations, ... -
Open Loop and Closed Loop Performance of Solid Oxide Fuel Cell Turbine Hybrid Systems During Fuel Composition Changes
(The American Society of Mechanical Engineers (ASME), 2017)The dynamic behavior of a solid oxide fuel cell gas turbine hybrid system (SOFC/GT) from both open and closed loop transients in response to sudden changes in fuel composition was experimentally investigated. A pilot-scale ... -
A Method for Dynamic Analysis of Three-Dimensional Solid Element Rotors With Uncertain Parameters
(The American Society of Mechanical Engineers (ASME), 2017)Three-dimensional solid element models often with a great number of degrees-of-freedom (DOFs) are now widely used for rotor dynamic analysis. While without reduction, it will cost considerable calculating resources and ... -
Acoustic Damper Placement and Tuning for Annular Combustors: An Adjoint-Based Optimization Study
(The American Society of Mechanical Engineers (ASME), 2017)Thermoacoustic instabilities pose a major threat to modern gas turbines. The use of acoustic dampers, like Helmholtz resonators, has proven useful for the mitigation of such instabilities. However, assessing the effect of ... -
Experimental Study on Instability Characteristics of Low-Swirl Flames in a Multinozzle Combustor With Different Swirling Arrays
(The American Society of Mechanical Engineers (ASME), 2017)This paper presents experimental study on self-excited combustion instability characteristics of premixed low-swirl flames in a multinozzle can combustor with counterswirl and coswirl arrays. Experiments were carried out ... -
Research on Phase Synchronization Strategies for Diesel Engines to Startup Quickly
(The American Society of Mechanical Engineers (ASME), 2017)Valid and quick phase synchronization is essential to diesel engine operation, with impacts on the starting time and emissions. This paper presents an innovative wheel shape of camshaft with four long teeth and four short ... -
Design and Calibration of a Full Scale Active Magnetic Bearing Based Test Facility for Investigating Rotordynamic Properties of Turbomachinery Seals in Multiphase Flow
(The American Society of Mechanical Engineers (ASME), 2017)The recent move toward subsea oil and gas production brings about a requirement to locate process equipment in deepwater installations. Furthermore, there is a drive toward omitting well stream separation functionality, ... -
Effect of Exit Pressure Pulsation on the Performance and Stability Limit of a Turbocharger Centrifugal Compressor
(The American Society of Mechanical Engineers (ASME), 2017)It is well known that compressor surge imposes a significant limit on the flow range of a turbocharged internal combustion engine. The centrifugal compressor is commonly placed upstream of the inlet manifold, and hence, ... -
An Experimental Study of the Aerodynamic Forcing Function in a 1.5 Steam Turbine Stage
(The American Society of Mechanical Engineers (ASME), 2017)The usual ways to measure the aerodynamic forcing function are complex and expensive. The aim of this work is to evaluate the forces acting on the blades using a relatively simpler experimental methodology based on a ... -
Cooling Injection Effect on a Transonic Squealer Tip—Part II: Analysis of Aerothermal Interaction Physics
(The American Society of Mechanical Engineers (ASME), 2017)A basic attribute for turbine blade film cooling is that coolant injected should be largely passively convected by the local base flow. However, the effective working of the conventional wisdom may be compromised when the ... -
A Computational and Experimental Compressor Design Project for Japanese and British High-School Students
(The American Society of Mechanical Engineers (ASME), 2017)This paper describes an innovative, three-day, turbomachinery research project for Japanese and British high-school students. The project is structured using modern teaching theories that encourage student curiosity and ... -
Modal Analysis Method for Blisks Based on Three-Dimensional Blade and Two-Dimensional Axisymmetric Disk Finite Element Model
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, a novel and efficient modal analysis method is raised to work on blisk structures based on mixed-dimension finite element model (MDFEM). The blade and the disk are modeled separately. The blade model is ... -
Cooling Injection Effect on a Transonic Squealer Tip—Part I: Experimental Heat Transfer Results and CFD Validation
(The American Society of Mechanical Engineers (ASME), 2017)Recent studies have demonstrated that the aerothermal characteristics of turbine rotor blade tip under a transonic condition are qualitatively different from those under a low-speed subsonic condition. The cooling injection ... -
Entrance Aspect Ratio Effect on S-Duct Inlet Performance at High-Subsonic Flow
(The American Society of Mechanical Engineers (ASME), 2017)This paper reports the internal performance evaluation of S-duct diffusers with different entrance aspect ratios as part of a parametric investigation of a generic S-duct inlet. The generic S-duct diffusers studied had a ... -
Numerical and Experimental Investigation of Axial Gap Variation in High-Pressure Steam Turbine Stages
(The American Society of Mechanical Engineers (ASME), 2017)This work aims at investigating the impact of axial gap variation on aerodynamic performance of a high-pressure steam turbine stage. Numerical and experimental campaigns were conducted on a 1.5-stage of a reaction steam ... -
Impact of Heat Release Distribution on the Spinning Modes of an Annular Combustor With Multiple Matrix Burners
(The American Society of Mechanical Engineers (ASME), 2017)The present article reports a numerical analysis of instability coupled by a spinning mode in an annular combustor. This corresponds to experiments carried out on the MICCA test facility equipped with 16 matrix burners. ...