The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Volume 65, No. 2, January 2020, Pages 170-177

Dewi Puspita Sari1, Helmizar2, Imam Syofii1, Darlius1, Dendy Adanta3,*
1 Department of Mechanical Engineering Education, Faculty of Teacher Training and Education, Universitas Sriwijaya, South Sumatera, Indonesia
2 Department of Mechanical Engineering, Faculty of Engineering, Universitas Bengkulu, Bengkulu, Indonesia
3 Department of Mechanical Engineering, Faculty of Engineering, Universitas Sriwijaya, South Sumatera, Indonesia
*Corresponding author: dendyadanta@ymail.com

KEYWORDS

Pico hydro; undershot; waterwheel; remote area

ABSTRACT

Pico hydro type undershot waterwheels are one of solutions to overcome energy crises in remote areas. The geometry of the wheels is based on the Betz limit concept: a wheel tangential velocity of one-third of the upstream water velocity. Although this concept has long been proposed, it has never been empirically demonstrated. The aim of this study was to identify the optimal ratio between the wheel tangential velocity (U) of undershot water wheels and the average upstream water velocity (V). The experimental work was done in a run of river conditions (irrigation) in remote areas with a discharge of 0.105 m3/s. Two instruments measured power output: a tachometer (used to measure wheel rotational speed) and a force meter (used to measure torque) with accuracies of 0.05% and 0.1 kg, respectively. Testing variation was done 29 times by loading masses ranging from 0–56 kg. A peak efficiency of 24.31% was achieved with a mechanical power of 10.55 W, a wheel rotation of 2.26 rpm and a torque of 29.01 N·m. This peak efficiency occurred at a U/V ratio of 0.39 if using the Gaussian fit approach of 0.41. Thus, the recommended U value for designing the undershot waterwheel is 0.4V. Furthermore, in the application of undershot waterwheels in independent power plants with a run of river conditions in remote areas, the installation of filter bars prior to the wheels is needed.

CITE THIS ARTICLE

MLA
Dewi, Puspita Sari, et al. “The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels.” Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 65.2 (2020): 170-177.

APA
Dewi, P. S., Helmizar, Imam Syofii, Darlius, & Dendy, A.(2020). The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 65(2), 170-177.

Chicago
Dewi Puspita Sari, Helmizar, Imam Syofii, Darlius and Dendy Adanta. “The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels.” Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 65, no. 2 (2020): 170-177.

Harvard
Dewi, P.S., Helmizar, Imam Syofii, Darlius, and Dendy, A., 2020. The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 65(2), pp. 170-177.

Vancouver
Dewi PS, Helmizar, Imam Syofii, Darlius, Dendy A. The Effect of the Ratio of Wheel Tangential Velocity and Upstream Water Velocity on the Performance of Undershot Waterwheels. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 2020;65(2): 170-177.

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