SIMULASI NUMERIK PENGARUH VARIASI RASIO PANJANG SUDU PENGGANGGU DENGAN SUDU UTAMA SETENGAH LINGKARAN TERHADAP KINERJA TURBIN CROSSFLOW POROS HORIZONTAL

Abstract

Energy is the biggest factor driving the progress of a country. As a result, humans are increasingly developing alternative and renewable energy sources that are environmentally friendly. Micro Hydro Power Plants (PLTMH) are small-scale power plants that utilize the potential energy of water. The crossflow water turbine is one of the components of PLTMH that functions to convert the potential energy of water into kinetic energy, thereby generating electricity. The objective of this research is to determine the effect of varying the ratio of the blade length to the half-circle main blade on the performance of the horizontal axis crossflow turbine. The study used numerical simulation methods to determine the power and efficiency of the turbine by varying the blade length ratio of 1.4:4, 1.6:4, 1.8:4, and 2:4 with a semicircular main blade. Variation of water capacity of 9.572 L/s, 11.024 L/s, 14.322 L/s, 16.152 L/s, and 18.113 L/s and variation of Reynold's number. In this research, the turbine with a ratio of 2: 4 capacity of 18.113 L / s has the highest power of 3.97 Watt. The most optimum efficiency in the ratio variation of 1.8:4 with a capacity of 9.572 L/s produces an efficiency of 87.42%. This simulation also shows the results of turbine performance through velocity contour, and velocity streamline. From the simulation results, it can be seen that varying the ratio of blade length to the disruptor blade can affect the performance of the crossflow turbine. The greater the pressure on the blade, the greater the power generated and the resulting effect on the efficient value given to the turbine performance.

Keywords: Crossflow, Power, Efficiency, Disruptive blade ratio, Simulation, Turbine.