Abstract
A small-scale test rig is developed to study the flow phenomena during off-design operations of a Francis turbine. The test rig can be operated in open and closed loops for a maximum head and discharge of 8 meters and 0.055 m3/s. The runner outlet diameter is 200 mm and rotates at 500 rpm. However, the test rig is not a model turbine test rig as per IEC 600193. Therefore, the repeatability of parameters is the key to establishing reliability in measurement and performance estimation. This paper presents the repeatability results of the turbine unit performed at a constant head. A control system is developed in the LABVIEW program with PID (Proportional, Integral, and Derivative) to run the turbine at the constant head with variable discharge and constant discharge at the variable head.
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