Design of a Francis Model Test Rig at Kathmandu University
Due to the growing energy demand in Nepal and its neighbouring countries, the focus
on hydropower development in Nepal has increased. As a consequence, the Turbine
Testing Laboratory (TTL) at Kathmandu University (KU) has been developed to handle
performance testing of model turbines. However, the laboratory is not yet equipped with
a test rig which can handle model tests according to the specications of the international standard for model tests of hydraulic turbines, IEC 60193. This master's thesis is one of the first stages towards the aim of developing turbine model test rigs in compliance with IEC 60193 at TTL.
The objective of this project is to design a Francis model test rig for TTL, using the
Francis test rig at the Waterpower Laboratory at NTNU as the initial design. The rig
must full the accuracy requirements of IEC 60193 and it should be capable of a
complete performance test for dierent sized turbines.
The pressure tank and the draft tube tank are designed to have the same shape as the
tanks at the Waterpower Laboratory, but with some difference in volume. The main
shaft and bearing block will include systems to measure the speed of rotation, axial
thrust, generator torque, and friction torque without the need of a hydraulic system.
The guide vane angles are manually controlled and measured by a rotary encoder.
The pressure dierence between inlet and outlet is measured by dierential pressure
transducers, calibrated by a deadweight manometer. The flow rate is measured by an electromagnetic flowmeter which is calibrated using the volumetric method. At the
outlet to the pumps, the temperature, oxygen level and pressure of the water is measured.
3D CAD drawings of the nal design are presented in this thesis. The most practical
and space efficient placement of the test rig in the laboratory has been chosen based
on discussions with the sta at NTNU and KU. The rig has been integrated in the
main pipe system, and designed for both open and closed loop modes. Procedures for
eciency measurements have also been developed.
The work done in this thesis is an input to the EnergizeNepal project on developing a
Francis model test rig at TTL.
Place, publisher, year, edition, pages
Institutt for energi- og prosessteknikk , 2014. , 115 p.
IdentifiersURN: urn:nbn:no:ntnu:diva-25543Local ID: ntnudaim:11600OAI: oai:DiVA.org:ntnu-25543DiVA: diva2:736505
Dahlhaug, Ole Gunnar, Professor