Design and Numerical Study of Hydrokinetic Turbines at Bakaru Hydropower Tail Race for the Application of Combined-Cycle Hydropower Systems
Keywords:
Combined-cycle hydropower systems, hydrokinetics turbine, tailrace, hydropower plantAbstract
The Net Zero Emission (NZE) target for 2060 has driven countries to increase the number of renewable energy power plants. In addition to building new renewable power plants, there is also an effort to enhance the capacity or optimize existing renewable power plants. One such optimization is the utilization of kinetic energy in the tail race of HEPP, which can be harnessed to generate electricity by installing a hydrokinetic turbine. The electricity generated from the tail race can be fed into the grid for network consumption or used to power auxiliary equipment at the hydroelectric plant. This reduces the selfconsumption (PS) of the plant, a concept known as Combined-Cycle Hydropower Systems. Bakaru Hydro Electric Power Plant (HEPP) is a run-ofriver hydroelectric power plant equipped with Francis vertical turbines, located in Bakaru Village, Lembang District, South Sulawesi. flow speed measurements of the tail race at Bakaru HEPP, using an Acoustic Doppler Current Profiler (ADCP), showed flow speeds ranging from 1.6 m/s to 2.4 m/s during maximum load conditions of 126 MW. Therefore, the theoretical power that can be generated by the hydrokinetic turbine is approximately 48 kW. It is important to determine the optimal placement of the turbine to maximize the utilization of water flow in the tail race and minimize the impact caused by the turbine installation. Therefore, this study designs three turbines with different blade
lengths based on solidity (0.1, 0.2, and 0.3). The chord variation is 100 mm, 209 mm, and 314 mm, and simulates their placement in two different positions in the tailrace to analyze the effect on the performance of the hydrokinetic turbine.
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