Feasibility Study of Small-Diameter Pico-Hydro Breastshot Waterwheel by Computational Method
DOI:
https://doi.org/10.37934/cfdl.15.11.169180Keywords:
Pico-hydro, Waterwheel, Breastshot, Computational MethodAbstract
Breastshot water wheels have very good simplicity, efficiency, and low head working range which is suitable for use in tropical rainforest villages in Indonesia. One of the weaknesses of the breastshot water wheel is that it has a very slow rotational speed which makes it need a high transmission ratio to be coupled with the generator. This study investigates the performance of a breastshot water wheel at smaller diameters and modifying the bucket inlet angle (36°, 49°, 71°, and 90°) by the computational fluid dynamics (CFD) method. In this case, the breastshot waterwheel's diameter ratio is equal to the head. Based on CFD results, the new configuration (this study) allowed us to increase the rotational speed to 30 to 35 rpm, higher than typical rotational speeds of breastshot water wheels of less than 10 rpm. Then, the bucket inlet angle and wheel rotation affect the performance of the breastshot waterwheel and are expressed using empirical law. Based on the empirical law approach, the 49° bucket is recommended because it has a stable efficiency above 60% and a wide operating range; the large discharge fluctuations do not change the turbine performance significantly.
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References
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