Publication

Flow survey and blade pressure measurements in a Francis turbine model

François Avellan, Mohamed Farhat, Philippe Dupont, Etienne Parkinson
1990
Conference Papers

Abstract

Experimental flow analysis of hydraulic machines is of prime importance for improving the design of such a unit. Moreover, computational fluid dynamics codes need an experimental data reference in order to check their ability to simulate the main flow features. To obtain such an experimental data base a Francis turbine model and an associated instrumentation is specially developed. Measurements of both global and local quantities are performed for five different operating points of the turbine. A five-hole probe mounted on a remote displacement system provides static pressure and velocity components along three stations in the machine. An original rotating instrumentation is implemented in order to obtain the pressure distribution over the blades of the runner at 28 points ( 17 on the suction side and 11 on the pressure side) arranged along three streamlines.

Official source

https://infoscience.epfl.ch/entities/publication/57ec65ea-07ce-4ea4-8645-3a4b2b54a922

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François Avellan, Mohamed Farhat, Philippe Dupont, Etienne Parkinson
1990
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/57ec65ea-07ce-4ea4-8645-3a4b2b54a922

About this result

Related concepts (32)

Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure. Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre (N/m2); similarly, the pound-force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in the imperial and US customary systems.

Static pressure

In fluid mechanics the term static pressure has several uses: In the design and operation of aircraft, static pressure is the air pressure in the aircraft's static pressure system. In fluid dynamics, many authors use the term static pressure in preference to just pressure to avoid ambiguity. Often however, the word ‘static’ may be dropped and in that usage pressure is the same as static pressure at a nominated point in a fluid. The term static pressure is also used by some authors in fluid statics.

Pressure measurement

Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure mechanically are called pressure gauges, vacuum gauges or compound gauges (vacuum & pressure). The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge.

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Flow survey and blade pressure measurements in a Francis turbine model

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