Publication

STABILITY OF TURBINE DRAFT TUBE VORTEX

2025

Abstract

For a given specific energy in hydraulic machines, there is a peak efficiency at a certain flow rate, known as the Best Efficiency Point (BEP). Beyond this point, efficiency decreases in an almost quadratic manner as flow rate deviates. This study aims to establish a connection between this phenomenon and the flow stability properties at two different operating points. The base flow vortex considered here is based on the experimental data by [1, 2]. Based on experimental measurement at a location of turbine outlet (upstream of draft tube), Susan-Resiga et al. [1] proposed a mathematical fitting of the turbine vortex into one rigid body motion and two batchelor vortices with two different core radii Ub = [0,Vθ,Vz]:

Official source

https://infoscience.epfl.ch/entities/publication/cdc6e1a0-263a-443a-816d-88115182fa51

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cdc6e1a0-263a-443a-816d-88115182fa51

About this result

Related concepts (32)

Turbine

A turbine ('tɜːrbaɪn or 'tɜːrbɪn) (from the Greek τύρβη, tyrbē, or Latin turbo, meaning vortex) is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced can be used for generating electrical power when combined with a generator. A turbine is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor.

Economic efficiency

In microeconomics, economic efficiency, depending on the context, is usually one of the following two related concepts: Allocative or Pareto efficiency: any changes made to assist one person would harm another. Productive efficiency: no additional output of one good can be obtained without decreasing the output of another good, and production proceeds at the lowest possible average total cost. These definitions are not equivalent: a market or other economic system may be allocatively but not productively efficient, or productively but not allocatively efficient.

Water turbine

A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Water turbines were developed in the 19th century and were widely used for industrial power prior to electrical grids. Now, they are mostly used for electric power generation. Water turbines are mostly found in dams to generate electric power from water potential energy. Water wheels have been used for hundreds of years for industrial power. Their main shortcoming is size, which limits the flow rate and head that can be harnessed.

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STABILITY OF TURBINE DRAFT TUBE VORTEX

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