Abstract

Cross flow turbine is considered the most appropriate turbine in micro hydro range of small hydro plants. In this range, variation in flow in small streams is very high and cross flow turbines are inherently suitable for such sites. Further cross flow turbines are easy in fabrication and can be fabricated locally. However, the efficiency of cross flow turbine in comparison of other conventional turbines is inferior. It is therefore there is scope to improve its efficiency. Under the present study, theoretical investigation has been performed to improve the performance of cross flow turbine by providing an interior guide tube (having different shapes and different locations) and draft tube in cross flow turbine. The combined effect of interior guide tube and draft tube has been studied. A substantial improvement in efficiency about 3.35% has been totaled.

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