Development of a Francis Turbine Test Rig at Kathmandu University
MetadataVis full innførsel
The focus on hydropower development in Nepal has increased as consequence of the growing energy demand in the region. To render possible locally executed performance tests on model turbines, the Turbine Testing Laboratory (TTL) at Kathmandu University (KU) is under development. The main objective of this master s thesis is to design a complete system for the efficiency measurement of Francis turbines at TTL. The test rig is to perform tests in accordance with IEC60193 (1), the International Standard for model testing of hydraulic turbines. The basis for the design of the Francis turbine test rig at TTL is the corresponding installation at the Waterpower Laboratory, NTNU. The rig is in comply with IEC60193 (1) and has provided good experiences. Piping and instrumentation diagrams for the Francis rig at TTL have been developed. Open and closed loop configurations are exemplified. Calibration of the instruments is limited to principal methods in compliance with IEC60193 (1). Differential pressure transducers that are calibrated by a deadweight manometer measure the differential pressure between the turbine inlet and outlet. An electromagnetic flowmeter calibrated by the weighing method measures the volume flow rate. In conjunction with the main shaft is an arrangement for measuring the generator torque and the rotational speed. Strain gauges mounted in T-rosette on a customised stub shaft measure the forces acting in both axial directions. A calibration procedure that involves a jig utilising the lever principle is proposed for the axial force measurements. The mechanical torque applied to the shaft by the runner is measured by strain gauges mounted on the stub shaft at a 45º angle to the shaft centerline. Calibrated masses attached to a lever arm via a pulley applies the torque in the appurtenant calibration procedure. 3D-drawings of TTL have been made, with components for the Francis test rig integrated into the existing piping arrangement. A bearing-shaft-housing system comprising double-row roller bearings and a back-to-back arrangement of angular contact ball bearings has been designed. The master thesis is done in relation to the NORAD-funded research program named Energize Nepal, aiming to facilitate Nepal in utilising their enormous hydropower resources.