FLUID MECHANICS
F1-10 Accessory
F1-32 Demonstration Francis turbine - Issue 1
This demonstration turbine provides a simple low cost introduction to the Francis inward flow reaction turbine showing its construction, operation and performance.
Ordering Specification
• Francis runner surrounded by 6 guide vanes inside PVC volute with clear acrylic front panel for visualisation
• Guide vanes adjustable when turbine is running with scale to indicate degree of opening and clamp to prevent movement
• Francis runner 60 mm diameter with 12 blades
• Brake force determined using Prony type brake dynamometer
• Inlet pressure gauge with range 0 to 2 bar
• Educational software as an option
MEASUREMENT CAPABILITIES
>Determining the operating characteristics, i.e. power, efficiency and torque, of a Francis Turbine at various speeds and guide vane openings
TOPDescription
A tapering, spiral shaped volute conveys water to the runner via a ring of guide vanes that are adjustable in angle to vary the flow through the turbine. Water enters the runner tangentially at the periphery, flows radially inwards through the blades towards the hub then exits axially via a draft tube.
Power generated by the turbine is absorbed by a Prony friction brake consisting of a pair of spring balances attached to a brake belt that is wrapped around a pulley wheel driven by the runner. The load on the turbine is varied by tensioning both spring balances which increases the friction on the pulley wheel. Brake force is determined from the difference in the readings on the two spring balances and the torque calculated from the product of this force and the pulley radius.
The head of water entering the turbine is indicated on a Bourdon gauge and the speed of rotation is measured using a non-contacting tachometer (not supplied).
The volute of the Francis turbine incorporates a transparent front cover for clear visualisation of the runner and guide vanes and is designed to complement the F1-25 Pelton turbine.
TOPTechnical Details
| item | value |
|---|---|
| Speed range: | 0 to 1000 RPM |
| Diameter of Francis runner: | 60 mm |
| Number of blades on runner: | 12 |
| Number of guide vanes: | 6, adjustable from fully open to fully closed |
| Range of spring balances: | 0 to 10 N x 0.1 N |
| Range of Bourdon gauge: | 0 to 2 bar |
Requires Hydraulics Bench Service unit F1-10
Requirements
F1-10 Hydraulics Bench
TOPShipping Specification
Individual accessories on request
TOPOverall dimensions
Height: 0.75m
Width: 0.34m excluding connections
Depth: 0.34m
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DATA SHEET
PRODUCT CATEGORY:
Engineering Education
F1-10 datasheetF1-10 Accessory Range:
For use in combination with the
F1-10 Hydraulics Bench
Computer aided
learning software: F1-301
Fluid Statics:
Fluid statics & manometry apparatus: F1-29
Fluid properties apparatus: F1-30
Fluid Dynamics:
Bernoulli's Theorem
demonstration: F1-15
Orifice & free jet flow: F1-17
Osborne Reynolds'
demonstration: F1-20
Flow meter demonstration: F1-21
Cavitation Demonstration: F1-28
Fluid friction apparatus: C6MkII-10
Pipe surge and water hammer apparatus: C7MkII
Pipe networks accessory: C11MkII
Hydraulic Flow Demonstrator: S16
Open Channel Flow:
Multi-purpose
teaching flume: C4MkII
Hydraulic Flow Demonstrator: S16
Rotodynamic Machines:
Demonstration Pelton turbine:F1-25
Centrifugal pump
characteristics: F1-27
Demonstration Francis turbine: F1-32
Complementary Equipment
Precision Pressure Gauge Calibrator: F4
Osborne Reynolds' Demonstration: F5
Cavitation Demonstration: F1-28
Particle Drag Coefficients: F12
Hydrogen Bubble Flow Visualisation System: F14MkII