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In small and micro hydropower schemes, common maintenance problems are the clogging of the intake by trash and the wearing out of the turbines by sediments. The Coanda effect screen is said to be self-cleaning (to operate without any external intervention to remove debris from the screen) and to have a desilting function (to exclude most of the particles whose diameter is above half of the aperture size of the screen). However it had never been extensively tested in a laboratory before. In consequence it was decided to carry out a series of tests of Coanda effect screens in order to evaluate the efficiency of the screens in excluding sediment and trash, and to test the capacity. Three screens have been tested with aperture sizes between the wires of 1mm, 0.5 mm and 0.2 mm. They have been tested at several discharges with clean water and with sand or grass mixed in the water.
Photo library of lab tests.
Summary report of lab tests.
Complete data report of lab tests.
Video presenting the tests: Coanda.wmv (1.9 MB)
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