This study has been employed experimentally towards Savonius water turbine by using Myring equation for n=1. This work will be varied to overlap ratio of 0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3. The overlap ratio of 0 can be called as the conventional turbine using half circle. The experiment is tested in flume tank by 1.1 m of wide and 0.8 m of height and the water velocity 0.22 m/s. The turbine have 0.4 m of height and 0.4 of diameter. This work will be calculated the torque coefficient and the power coefficient. The power coefficient is called the performance coefficient. The results indicated that the best performance coefficient has improved in about 62.83 % at overlap ratio of 0.2.
The flow visualization of vertical axis Savonius current turbine has been investigated numerically by using Myring formula n of 1. Computational Fluid Dynamics or CFD approach has been carried out by using Gambit for geometry and ANSYS 17.0 running to solve the incompressible U-RANS. This work has been done by comparing the performance between Myring and conventional Savonius. The y+ in the first layer of blade surface has been made between 30 and 100 with y+ in about 52. The turbulence model will be chosen the Realizable k-epsilon (RKE) for this turbine case. The numerical obtain the torque and power coefficient and the power coefficient called the turbine performance. The numerical simulation has been validated by experimental results towards torque coefficient. The results have indicated that the Myring formula n = 1 have the best performance compared this one by decreasing the pressure in attached flow area.
This work has been done experimentally to the Savonius water current turbine by means of Myring equation for n =1. The myring for n=2 is called the conventional turbine with half circle or bucket. Experiment is tested in flume tank by 1.1 m of wide and 0.8 m of height. The free stream velocity is 0.22 m/s measured at 1.5 m from nozzle. The model is the Myring equation with n=1 by 0.4 m of height and 0.4 m of turbine diameter. The experimental study has investigated the torque coefficient and the power coefficient. The power coefficient has been called the performance coefficient. The experimental results shows that the Myring formula n = 1 have the performance coefficient higher than the conventional blade. The myring blade for n = 1 increases in about 42.88 % compared to the conventional blade.
Angin merupakan salah satu sumber renewable terbaik dengan ketersediaan yang sangat melimpah. Penelitian ini menambahkan obstacle segitiga sama sisi diletakkan di depan sisi returning blade pada turbin Darrieus. Obstacle segitiga di depan returning blade diduga akan menurunkan drag sisi sudu returning blade dengan konsekuensi akan menurunkan torsi negatif dan akibatnya akan meningkatkan torsi total dan daya turbin Darrieus. Penelitian ini menggunakan metode numerik dengan menggunakan foil NACA 0015, panjang chord 20 cm, diameter Darrieus berukuran 800 cm, kecepatan angin 3 m/s. Penelitian dilakukan dengan memvariasikan jarak obstacle y = 20 cm, 40 cm dan 60 cm. Simulasi numerik menggunakan moving mesh dengan jenis turbulence model Reliazible k-epsilon (RKE). Simulasi numerik melakukan ploting terhadap koefisien torsi (Cm) dan koefisien daya (Cp) Hasil dari penelitian ini menunjukkan bahwa kinerja terbaik pada y = 60 cm dengan maksimum koefisien daya sebesar 0,377 pada TSR 1,535 atu meningkat sekitar 7,08%.
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