Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2481-2500 of 9564
-
A Study on the Emissions of Alternative Aviation Fuels
(The American Society of Mechanical Engineers (ASME), 2017)Currently, the aviation sector is seeking for alternatives to kerosene from crude oil, as part of the efforts combating climate change by reducing greenhouse gas (GHG) emissions, in particular carbon dioxide (CO2), and ... -
Performance Metric for Turbine Stage Under Unsteady Pulsating Flow Environment
(The American Society of Mechanical Engineers (ASME), 2017)In a turbine stage for a vehicular turbocharger or a pulse detonation engine (PDE) system, the power extraction process is inherently unsteady due to a highly pulsating flow delivered from the upstream combustor. Characterizing ... -
Performance Characterization of Twin-Scroll Turbine Stage for Vehicular Turbocharger Under Unsteady Pulsating Flow Environment
(The American Society of Mechanical Engineers (ASME), 2017)Unsteady three-dimensional computations have been implemented on a turbocharger twin-scroll turbine system (volute–turbine wheel–diffuser). The flow unsteadiness in a turbocharger turbine system is essentially driven by a ... -
Analysis and Comparison of the Performance of an Inverted Brayton Cycle and Turbocompounding With Decoupled Turbine and Continuous Variable Transmission Driven Compressor for Small Automotive Engines
(The American Society of Mechanical Engineers (ASME), 2017)For an internal combustion engine, a large quantity of fuel energy (accounting for approximately 30% of the total combustion energy) is expelled through the exhaust without being converted into useful work. Various ... -
Optimization Method and Simulation Study of a Diesel Engine Using Full Variable Valve Motions
(The American Society of Mechanical Engineers (ASME), 2017)Variable valve timing technologies for internal combustion engines are used to improve power, torque, and increase fuel efficiency. Details of a new solution are presented in this paper for optimizing valve motions of a ... -
Investigation of Cycle-to-Cycle Variation of In-Cylinder Engine Swirl Flow Fields Using Quadruple Proper Orthogonal Decomposition
(The American Society of Mechanical Engineers (ASME), 2017)It has been observed that the swirl characteristics of in-cylinder air flow in a spark ignition direct injection (SIDI) engine affect the fuel spray dispersion and flame propagation speed, impacting the fuel mixture formation ... -
In-Cylinder Flow Correlations Between Steady Flow Bench and Motored Engine Using Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2017)Intake port flow performance plays a substantial role in determining the volumetric efficiency and in-cylinder charge motion of a spark-ignited engine. Steady-state flow bench and motored engine flow computational fluid ... -
Experimental and Computational Analysis of the Swirling Flow Generated by an Axial Counter-Rotating Swirler in a Rectangular Model Chamber Using Water Test Rig
(The American Society of Mechanical Engineers (ASME), 2017)This paper reports the particle image velocimetry (PIV) measurement of swirling flow in a confined rectangular-shaped model combustion chamber. Water is used as the working fluid, and the average profiles of axial, radial, ... -
Quasidimensional Modeling of Diesel Combustion Using Detailed Chemical Kinetics
(The American Society of Mechanical Engineers (ASME), 2017)This paper presents an efficient approach to diesel engine combustion simulation that integrates detailed chemical kinetics into a quasidimensional fuel spray model. The model combines a discrete spray parcel concept to ... -
Performance Prediction and Optimization of Low Pressure Steam Turbine Radial Diffuser at Design and Off-Design Conditions Using Streamline Curvature Method
(The American Society of Mechanical Engineers (ASME), 2017)The performance of the radial diffuser of a low pressure (LP) steam turbine is important to the power output of the turbine. A reliable and robust prediction and optimization tool is desirable in industry for preliminary ... -
Direct Numerical Simulation of Rotating Cavity Flows Using a Spectral Element-Fourier Method
(The American Society of Mechanical Engineers (ASME), 2017)A high-order numerical method is employed to investigate flow in a rotor/stator cavity without heat transfer and buoyant flow in a rotor/rotor cavity. The numerical tool used employs a spectral element discretization in ... -
Evaluation of Measurement Uncertainties for Pneumatic Multihole Probes Using a Monte Carlo Method
(The American Society of Mechanical Engineers (ASME), 2017)The subject of this paper is a statistical method for the evaluation of the uncertainties for pneumatic multihole probe measurements. The method can be applied to different types of evaluation algorithms and is suitable ... -
Innovative Turbine Stator Well Design Using a Kriging-Assisted Optimization Method
(The American Society of Mechanical Engineers (ASME), 2017)At present, it is a common practice to expose engine components to main annulus air temperatures exceeding the thermal material limit in order to increase the overall engine performance and to minimize the engine specific ... -
Enhanced Robust Design Simulation and Application to Engine Cycle and Technology Design
(The American Society of Mechanical Engineers (ASME), 2017)Increased computing power has enabled designers to efficiently perform robust design analyses of engine systems. Traditional, filtered Monte Carlo methods involve creating surrogate model representations of a physics-based ... -
Computational Fluid Dynamics and Thermal Analysis of Leaf Seals for Aero-engine Application
(The American Society of Mechanical Engineers (ASME), 2017)Aero-engine gas turbine performance and efficiency can be improved through the application of compliant shaft seal types to certain sealing locations within the secondary air system. Leaf seals offer better performance ... -
HAYNES NS-163 Alloy: A Novel Nitride Dispersion-Strengthened CO-Base Alloy
(The American Society of Mechanical Engineers (ASME), 2017)HAYNES® NS-163® alloy was developed by Haynes International Inc., Kokomo, IN, for high-temperature structural applications by pursuing a dual manufacturing approach: the fabrication of components in the readily weldable ... -
Prediction of Nonlinear Evolution of Fatigue Damage Accumulation From an Energy-Based Model
(The American Society of Mechanical Engineers (ASME), 2017)An energy-based framework is developed for welded steel and AL6061-T6 for assessment of nonlinear evolution of fatigue damage accumulation along fatigue life. The framework involves interrogation at continuum using a newly ... -
Investigation of Effective Groove Types for a Film Riding Seal
(The American Society of Mechanical Engineers (ASME), 2017)Over the past two decades, significant efforts have been made to introduce film riding sealing technology on large industrial or aerospace gas turbines. The main challenge comes from the high surface speeds and high ... -
Leakage Degradation of Straight Labyrinth Seal Due to Wear of Round Tooth Tip and Acute Trapezoidal Rub-Groove
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, labyrinth seal leakage is numerically quantified for an acute trapezoidal rub-groove accompanied with a rounded tooth, as a function of rub-groove sizes and tooth-groove axial positions. Analyses parameters ... -
Impulse Mistuning of Blades and Vanes
(The American Society of Mechanical Engineers (ASME), 2017)Impulse mistuning is an alternative approach for the reduction of vibration stresses of blades and vanes. In contrast to most other approaches, it is not a direct energy dissipation approach but a mistuning based one. ...