scholarly journals High Speed Flow Visualisation of an Impinging Jet on a Pelton Turbine Bucket

2007 ◽  
Author(s):  
Alexandre Perrig ◽  
Mohamed Farhat ◽  
Franc¸ois Avellan
Keyword(s):  
High Speed ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Flow Visualisation ◽  
Pelton Turbine ◽  
Flow Development ◽  
Speed Flow ◽  
Turbine Bucket ◽  
Reduced Scale ◽  
Development And Evolution

This paper deals with flow investigations using endoscopes in a single-injector reduced scale Pelton turbine performed with a CMOS high-speed camera. Both onboard and external visualizations techniques of the flow in a bucket are presented. The flow observations evidence the unsteadiness of the successive steps of jet/bucket interaction, free surface flow development and evolution throughout the bucket duty cycle.

scholarly journals Flow in a Pelton Turbine Bucket: Numerical and Experimental Investigations

2005 ◽  
Vol 128 (2) ◽  
pp. 350-358 ◽  
Author(s):  
Alexandre Perrig ◽  
François Avellan ◽  
Jean-Louis Kueny ◽  
Mohamed Farhat ◽  
Etienne Parkinson
Keyword(s):  
Homogeneous Model ◽  
Free Surface Flow ◽  
Flow Patterns ◽  
Surface Flow ◽  
Experimental Investigations ◽  
Pressure Measurements ◽  
Two Phase ◽  
Pelton Turbine ◽  
Flow Visualizations ◽  
Turbine Bucket

The aim of the paper is to present the results of investigations conducted on the free surface flow in a Pelton turbine model bucket. Unsteady numerical simulations, based on the two-phase homogeneous model, are performed together with wall pressure measurements and flow visualizations. The results obtained allow defining five distinct zones in the bucket from the flow patterns and the pressure signal shapes. The results provided by the numerical simulation are compared for each zone. The flow patterns in the buckets are analyzed from the results. An investigation of the momentum transfer between the water particles and the bucket is performed, showing the regions of the bucket surface that contribute the most to the torque. The study is also conducted for the backside of the bucket, evidencing a probable Coanda interaction between the bucket cutout area and the water jet.

Flow Field Study and Structure Optimization of Pelton Tubine Bucket

2013 ◽  
Vol 655-657 ◽  
pp. 144-148
Author(s):  
Xia Ma ◽  
Wu Gui Hua ◽  
Jie Li ◽  
Gang Li
Keyword(s):  
Free Surface ◽  
Homogeneous Model ◽  
Structure Optimization ◽  
Free Surface Flow ◽  
Flow Patterns ◽  
Surface Flow ◽  
Two Phase ◽  
Pelton Turbine ◽  
Flow Visualizations ◽  
Turbine Model

The aim of the paper is to present the results of investigations conducted on the free surface flow in a Pelton turbine model bucket. Unsteady numerical simulations, based on the two-phase homogeneous model, are performed together with flow visualizations. The results obtained allow defining five distinct zones in the bucket from the flow patterns. The flow patterns in the buckets are analyzed from the results. An investigation of the momentum transfer between the water particles and the bucket is performed, showing the regions of the bucket surface that contribute the most to the torque. The study is also conducted for the backside of the bucket, evidencing a probable Coanda interaction between the bucket cutout area and the Water jet.

High speed flow visualisation

1986 ◽  
Vol 23 (2) ◽  
pp. 85-104 ◽  
Author(s):  
P.J. Bryanston-Cross
Keyword(s):  
High Speed ◽  
Flow Visualisation ◽  
High Speed Flow ◽  
Speed Flow

Numerical analysis of high-speed liquid lithium free-surface flow

2012 ◽  
Vol 87 (5-6) ◽  
pp. 569-574 ◽  
Author(s):  
Sergej Gordeev ◽  
Volker Heinzel ◽  
Robert Stieglitz
Keyword(s):  
Free Surface ◽  
Numerical Analysis ◽  
High Speed ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Liquid Lithium

scholarly journals The Design and Testing of a Radial Flow Turbine for Aerodynamic Research

1991 ◽  
Author(s):  
I. Huntsman ◽  
H. P. Hodson ◽  
S. H. Hill
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Three Dimensional ◽  
Surface Flow ◽  
Stream Line ◽  
Flow Visualisation ◽  
Gas Generator ◽  
Low Speed ◽  
Scaling Parameters ◽  
Design And Testing

This paper describes the design of a high-speed radial inflow turbine for use as part of a gas-generator, and the design of a large-scale (1.2 m tip dia.) low-speed model of the high-speed turbine. Stream-line curvature throughflow, two-dimensional blade-to-blade and fully three-dimensional inviscid and viscous calculation methods have been used extensively in the analysis of the designs. The use of appropriate scaling parameters and their impact on turbine performance is discussed. A simple model shows, for example, how to model the blade lean in the inducer which serves to balance the effect of meridional curvature at inlet to the rotor and can be used to unload the rotor tip. A brief description of the low speed experimental facility is followed by a presentation and discussion of experimental results. These include surface flow visualisation patterns on both the rotor and stator blades and blade row exit traverses.

A Coupled SPH-FEM Solver for Modeling Surface Effect Ship (SES) Bow Seal Dynamics

2020 ◽  
Author(s):  
John Gilbert ◽  
Leigh McCue
Keyword(s):  
High Speed ◽  
Surface Effect ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Numerical Predictions ◽  
Surface Effect Ship ◽  
Particle Hydrodynamics ◽  
Hyper Elastic ◽  
Smoothed Particle ◽  
The University

Abstract The life of Surface Effect Ship (SES) bow and finger seals are often short-lived due to a combination of environmental effects and dynamic loading due to high-speed operation. Improving SES seal robustness requires a deeper understanding of the dynamics and loads seen by SES skirt seals during operation. In this work, we present the results of a validation study performed for a coupled, smoothed particle hydrodynamics (SPH) - finite element method (FEM) solver developed to study fluid-structure impact and free-surface flow interaction with hyper-elastic structures. This work continues and extends the earlier coupled SPH-FEM approach of Yang et al. [1]. Numerical predictions for skirt seal displacement are compared against the experimental observations of Zalek and Doctors performed by the Marine Hydrodynamics Laboratory at the University of Michigan [2].

Flow dynamics of the free surface flow in the rotating buckets of a Pelton turbine

2009 ◽  
Vol 223 (5) ◽  
pp. 609-623 ◽  
Author(s):  
Zh Zhang
Keyword(s):  
Free Surface Flow ◽  
Surface Flow ◽  
Experimental Investigations ◽  
Hydraulic Efficiency ◽  
Pelton Turbine ◽  
Impact Forces ◽  
Invariance Equation ◽  
Power Exchange ◽  
The Impact ◽  
Rotating Bucket

The relative flow in the rotating buckets of a Pelton turbine was calculated with respect to the influences of centrifugal, Coriolis, and impact forces. Based on the assumption of frictionless flows, the so-called invariance equation was presented, which enables the changeable flow velocity in a rotating bucket to be calculated. The introduced jet layer method relying on the invariance equation significantly simplifies the computation of the entire jet expansion in the rotating bucket. For purely radial flows, contributions of centrifugal, Coriolis, and impact forces to the power exchange and the corresponding effectiveness relations were quantified. In general, the centrifugal force only performs the negligible work, if compared with the effectiveness of the Coriolis and the impact forces. Various calculation examples were presented to show the flow development and the effectiveness of all active forces in the rotating bucket and to explain the application of the invariance equation. The results presented in the article for frictionless flows can be applied as the reference for further computational and experimental investigations with respect to the flow friction effects on the hydraulic efficiency of a Pelton turbine.

Pressure Losses in Combining Subsonic Flows Through Branched Ducts

1990 ◽  
Author(s):  
N. I. Abou-Haidar ◽  
S. L. Dixon
Keyword(s):  
High Speed ◽  
Working Fluid ◽  
Flow Visualisation ◽  
Local Flow ◽  
Subsonic Flows ◽  
Pressure Losses ◽  
Combined Flow ◽  
Speed Flow ◽  
Flow Through ◽  
Wide Speed Range

An investigation of the “additional” total pressure losses occurring in combining flow through several sharp-edged three-leg junctions has been made. Experimental results covering a wide speed range up to choking are presented for three flow geometries of a lateral branch off a straight duct using dry air as the working fluid. A new theoretical flow model provided results in fairly good agreement with the experimental data obtained. Flow visualisation of the high speed flow using the Schlieren method revealed the presence of normal shock waves in the combined flow about one duct diameter downstream of the junction. The highest attainable Mach number (M3) of the averaged downstream (combined) flow was 0.66 for several of the flow geometries. This value of M3 appears to be the maximum possible and is the result of a combination of flow separation and local flow choking.

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