Sirojuddin, L.K. Wardhana, O. Rizky, R. Ibnawati, Junior R. Syahri
Banki turbine is a cross flow type water turbine, the construction is simple and suitable for micro hydro power plants. Increasing power efficiency is a very important point. One of the method to increase power is by controlling the water inflow to the runner. This research aimed to investigate variations of the nozzle arch against the water inflow of the banki turbine’s runner in order to obtain good flow trajectory of water from the first to the second stage of runner blades without striking the shaft. The design of bottom runner case was round and the top was rectangular. The nozzle arch 2D geometry were formed in AutoCAD software, while the 3D geometry using Solidworks. Flow analysis and simulation using CFD software. The nozzle arch were made into five variants, N-1 variant radius was 200 mm, N-2 = 225 mm, N-3 = 250 mm, N-4 = 275 mm, and N-5 = 300 mm. The water discharge was 2 m3/min with head 5.5 m, the angle of water inlet was 16° from vertical direction. It was found that the best variant were N-3, where the flow trajectory and the velocity from the first stage to the second stage of the blade did not strike the shaft. © 2020, Springer Nature Singapore Pte Ltd.
Universitas Negeri Jakarta, Jakarta, Indonesia
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