Journal of Fluids Engineering: Recent submissions
Now showing items 1261-1280 of 9024
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Large Eddy Simulation and CDNS Investigation of T106C Low-Pressure Turbine
(The American Society of Mechanical Engineers (ASME), 2018)This study investigates the aerodynamic performance of a low-pressure turbine, namely the T106C, by large eddy simulation (LES) and coarse grid direct numerical simulation (CDNS) at a Reynolds number of 100,000. Existing ... -
Transient Pressure Analysis of a Prototype Pump Turbine: Field Tests and Simulation
(The American Society of Mechanical Engineers (ASME), 2018)The transient behaviors of a prototype pump turbine are very important to the safe operation of a pumped-storage power plant. This is because the water hammer pressure during transient events affects the pressure surges ... -
Experimental Measurement of Vortex Ring Screen Interaction Using Flow Visualization and Molecular Tagging Velocimetry
(The American Society of Mechanical Engineers (ASME), 2018)The interaction of vortex rings with thin wire mesh screens is investigated using laser-induced fluorescence (LIF) and molecular tagging velocimetry (MTV). The existence of vortex shedding from individual wires of the ... -
Experimental and Numerical Investigations on the Origins of Rotating Stall in a Propeller Turbine Runner Operating in No-Load Conditions
(The American Society of Mechanical Engineers (ASME), 2018)Hydraulic turbines are more frequently used for power regulation and thus spend more time providing spinning reserve for electrical grids. Spinning reserve requires the turbine to operate at its synchronous rotation speed, ... -
Stokes Flow Within Networks of Flow Branches
(The American Society of Mechanical Engineers (ASME), 2018)Stokes flow in the branches of structured looped networks with successive identical square loops and T-junction branches is studied. Analytical expressions of the flow rate in the branches are determined for network of ... -
Smoothed Particle Hydrodynamics for the Rising Pattern of Oil Droplets
(The American Society of Mechanical Engineers (ASME), 2018)The problem of rising droplets in liquids is important in physics and has had many applications in industries. In the present study, the rising pattern of oil droplets has been examined using the smoothed particle hydrodynamics ... -
Effects of Surface Waviness on the Interaction of Oblique Shock Wave With Turbulent Boundary Layer
(The American Society of Mechanical Engineers (ASME), 2018)Present investigation deals with the interaction of an incident oblique shock wave on a turbulent boundary layer over a wavy surface. The oblique shock wave was generated by an 8 deg wedge in a freestream Mach number of ... -
Experimental Investigation on Hydrodynamics of Two-Phase Crude Oil Flow in Horizontal Pipe With Novel Surfactant
(The American Society of Mechanical Engineers (ASME), 2018)The hydrodynamic entrance length, pressure drop analysis, viscosity, and fully developed velocity profile in horizontal pipe for crude oil with and without water and surfactant were studied in a 2 in ID horizontal pipe of ... -
Numerical Simulations for the Wake Prediction of a Marine Propeller in Straight-Ahead Flow and Oblique Flow
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents the capability of a numerical code, isis-cfd, based on the solution of the Navier–Stokes equations, for the investigation on the hydrodynamic characteristics of a marine propeller in open water. Two ... -
On Coarse Grids Simulation of Compressible Mixing Layer Flows Using Vorticity Confinement
(The American Society of Mechanical Engineers (ASME), 2018)In this work, the capability and performance of the vorticity confinement (VC) implemented in a high-order accurate flow solver in predicting two-dimensional (2D) compressible mixing layer flows on coarse grids are ... -
Blast Wave-Induced Mixing in a Laser Ignited Hypersonic Flow
(The American Society of Mechanical Engineers (ASME), 2018)A laser ignition system suitable for a hypersonic scramjet engine is considered. Wall-modeled large eddy simulation (LES) is used to study a scramjet-like geometry with a single hydrogen injector on the inlet, at a Mach 8 ... -
Simulation Modeling of the Combined Damage Caused by Cavitation and Abrasion in Sediment-Laden Liquids
(The American Society of Mechanical Engineers (ASME), 2018)Combined damage caused by cavitation and abrasion is a serious problem concerning hydraulic structures and machinery operating in hyper-concentrated sediment-laden rivers. Conceptualization of a model for simulation and ... -
Energy Analysis in a Pump-Turbine During the Load Rejection Process
(The American Society of Mechanical Engineers (ASME), 2018)Complex energy conversion and energy dissipation occur in pump-turbines during the load rejection process. However, the underlying fluid mechanism is not clear. In order to solve these problems, in this study, a three-dimensional ... -
Experimental Study of the Francis Turbine Pressure Fluctuations and the Pressure Fluctuations Superposition Phenomenon Inside the Runner
(The American Society of Mechanical Engineers (ASME), 2018)The pressure fluctuations in both the rotating runner and the other fixed components in a model Francis turbine under various loads were experimentally measured by means of onboard measuring equipment in the runner and ... -
Semitheoretical Prediction of the Wetting Characteristics of Aqueous Ionic Liquid Solution on an Aluminum Finned-Tube Desiccant Contactor
(The American Society of Mechanical Engineers (ASME), 2018)This study involves exploring a new design of an internally cooled/heated desiccant contactor by using a new ionic liquid (IL) solution as the sorptive solution. In order to optimize its operative performance, a semitheoretical ... -
Effects of Steam Ingestion on Under Fuselage Inlet Performance During a Catapult-Assisted Takeoff Process
(The American Society of Mechanical Engineers (ASME), 2018)A naval aircraft has the potential to experience inlet performance decline when taking off from the carrier deck with the steam-driven catapult assistance. The steam ingested into inlet may cause time-dependent rise and ... -
Computational Fluid Dynamics Study of the Dead Water Problem
(The American Society of Mechanical Engineers (ASME), 2018)The dead water problem, in which under certain conditions a vessel advancing in a stratified fluid experiences a considerable increase in resistance respect to the equivalent case without stratification, was studied using ... -
A Hydrodynamic Study of a Propeller Turbine During a Transient Runaway Event Initiated at the Best Efficiency Point
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents a hydrodynamic study of a propeller turbine runaway based on flow simulations and measurements results. Runaways are considered one of the most structurally damaging conditions a hydraulic turbine may ... -
Influence of Nonflow Zone (Back Cavity) Geometry on the Performance of Pumps as Turbines
(The American Society of Mechanical Engineers (ASME), 2018)The larger objective of this research comes from the fact that optimization studies in “pumps operated as turbines” have concentrated only within flow zones without any physical perception regarding the influence of nonflow ... -
Aerodynamics of a Convex Bump on a Ground-Effect Diffuser
(The American Society of Mechanical Engineers (ASME), 2018)A ground-effect diffuser is an upward-sloping section of the underbody of a racing car that enhances aerodynamic performance by increasing the downforce, thus improving tire grip. The downforce generated by a diffuser can ...