Initial testing
The work was done in South Australia, the driest state of the driest
inhabited continent, and in contrast to Sarawak, it was difficult to find
a suitable waterway in which to test the turbine. There were no suitable
laboratory facilities in South Australia and funding was not available to
hire the large laboratory towing tank at the Australian Maritime College,
which would have been ideal. Several possibilities were assessed and
found to have either too low flow velocity or not enough flow area.
The final choice was a 2.1 m wide concrete channel at Bolivar waste water
treatment plant which carries secondary treated sewage effluent
(i.e. no solids, clear but nutrient-rich water with lots of long stringy
sticky algae). Flow depth and velocity varied slightly with time of day,
but average depth was about 1 m and average velocity was about
1 m/s. Although not ideal, this channel was available at no cost and is
fairly close to the university campus, making logistics relatively simple.
The 1 m/s flow velocity was considered representative of typical sites in
Sarawak, but the 1 m depth meant that the original design,which called
for a 1.6 m diameter turbine to deliver 200 Win a 1 m/s current, had to
be reduced to 0.8 m diameter. The expected power was now reduced to
about 50 W, calculated as below.
Initial testingThe work was done in South Australia, the driest state of the driestinhabited continent, and in contrast to Sarawak, it was difficult to finda suitable waterway in which to test the turbine. There were no suitablelaboratory facilities in South Australia and funding was not available tohire the large laboratory towing tank at the Australian Maritime College,which would have been ideal. Several possibilities were assessed andfound to have either too low flow velocity or not enough flow area.The final choice was a 2.1 m wide concrete channel at Bolivar waste watertreatment plant which carries secondary treated sewage effluent(i.e. no solids, clear but nutrient-rich water with lots of long stringysticky algae). Flow depth and velocity varied slightly with time of day,but average depth was about 1 m and average velocity was about1 m/s. Although not ideal, this channel was available at no cost and isfairly close to the university campus, making logistics relatively simple.The 1 m/s flow velocity was considered representative of typical sites inSarawak, but the 1 m depth meant that the original design,which calledfor a 1.6 m diameter turbine to deliver 200 Win a 1 m/s current, had tobe reduced to 0.8 m diameter. The expected power was now reduced toabout 50 W, calculated as below.
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