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Francis Turbine Test Rig to be installed in TTL
The Francis turbine test rig consists of a diffuser, rig pipes, a valve, turbine supports, rig support columns, generator support and a draft tube support. This test rig is still under construction and will soon be completed. The test rig shall be used for the testing of the optimized design of Francis runner.
Cross-Sectional View of the Francis Runner
The Cross Flow turbine test rig is used to test the efficiency of cross flow turbines by varying head and discharge in the lab.
The Rapid Prototyping Machine (3D Printer) at TTL can print any sort of 3D model, stacking up layer by layer of ABS material. It can print the models within in the size range of 250 mm x 290mm x 320mm with an accuracy of 0.02mm. The machine is especially used for producing complicated models such as Francis runner blades, Pelton buckets, gears which are merely impossible to create in other manual machines with such accuracy. It can also be used for developing plastic models of different industrial products new to the existence for mass production.
Identification of material and its properties plays an important role in selection of suitable turbine material for manufacturing and maintenance. So, Turbine Testing Lab is also involved in conducting laboratory investigation of metallurgy of metals.
Flow visualization probably always played an important role in the study of fluid motion. Advancement of measurement in multiple velocity component through a non-intrusive method developed a laser probe during 1960s which limits in point wise velocity measurement. Nevertheless introduction to Particle Image Velocimetry (PIV) facilitates in global velocity measurement using whole field technique which is why it is considered as remarkable in optical fluid flow system.
The principle behind a PIV system is simple: The flow is illuminated by a strong light source, and the particle positions are recorded by imaging the light scattered from tracer particles onto a recording medium such as a photographic film or a matrix detector. Then, in order to handle the great amount of data PIV uses sophisticated post-processing components of PIV
The main components are:
A borescope is an optical device consisting of a rigid or flexible tube with an eyepiece on one end, an objective lens on the other linked together by a relay optical system in between. The optical system is usually surrounded by optical fibers used for illumination of the remote object. The borescopes at TTL is used in non destructive testing techniques for recognizing defects or imperfections in turbine blades due to sand erosions or other problems.
Sediment erosion in hydraulic turbines has been a major challenge in development of hydropower projects in Nepal. A new test setup has been designed in order to carry out tests of sediment erosion in Francis runner blades.. The test rig has been developed and installed at Turbine Testing Laboratory(TTL). The test carried out in this setup has shown that the Francis turbines designed with traditional design methodology is highly prone to loss of material due to sediment erosion.
The Shenitech STUF-200H Handheld Ultrasonic Flowmeter available at TTL is a battery powered flowmeter with a capability of full size flowmeter. Based on clamp-on transit time flow measurement principle, the device measures flow rate of liquid in a pipe from outside of the pipe by using a pair of ultrasonic transducers. It has also a built-in data logger, which allows storage of 2000 lines of data. It can measure flow in virtually all type of pipes ranging from 20 mm to 6000 mm diameter with liquids such as portable water, oil, chemicals, raw sewage, sea water, ultra pure liquids, etc.