ISST ITS 2018_Performance study of installed an I-65o type cylinder.pptx

2018 ISST International Conference Presentation
This presentation discusses efforts to improve the aerodynamic performance of Savonius wind turbines by placing an I-65-type disruptor cylinder in front of the return blade. The result is a 25.66 percent increase in the power coefficient compared to the undisturbed turbine.

1. Performance study of installed an I-65 o type cylinder at the upstream of returning blade of Savonius wind turbine, comparison with conventional Savonius wind turbine Gunawan Sakti GRADUATE STUDENT DEPARTMENT OF MECHANICAL ENGINEERING ITS 2018

2. SAVONIUS wind turbine Simple and cheaper in construction Independent of wind direction Good starting torque at lower wind speed Lowest performance It have various study to improve performance I S S T

3. Increase the performance of Savonius wind turbine experimentally by installing an I-65 o type bluff body at the upstream of returning blade of the turbine. I S S T

4. I S S T Earlier Study as Refference Material No. AUTHOR TOPICS METHODS Result 1 Triyogi et al (2009) bluffbody experiment drag coefficient (C D ) decrease up to 52% , Re= 5.3 x 10 4 , S/D=1.375, cutting angle = 65 ⁰ 2 Aiba & W atanabe (1997) bluffbody experiment drag coefficient (C D ) reach smaller value for cutting angle θ s = 53 o and Re > 2.5 x 10 4 3 Tsutsui & Igarashi (2002) bluffbody experiment The optimum conditions of the drag reduction are d/D = 0,25, L/D = 1,75 - 2,0. the drag rod reduction is 63% 4 Lee et al (2004) bluffbody experiment the maximum drag reduction 25% is observed at a pitch ratio of L=D =1:833 with a control rod diameter of d=D =0:233. 5 Altan and Altigan (2008) Savonius experiment & 2D numeric The Power Coefficient ( C p ) increase up to 38.5 % within curtain dimension ℓ 1 = 45 cm dan ℓ 2 = 52 cm and α = 45 o dan β = 15 o . 6 Tamotsu Igarashi (1981) Bluffbody experiment Quasy-staionaire vortices phenomenon, change of the flfow structure around the cylinders takes place at a specific spacing and in a specific reynolds ranges. 7 Mohammed et al (2010 ) Savonius experiment & 2D numeric the power output coefficient increase almost 40% is finally obtained at λ = 0.7 8 Mahmoud et al (2012) Savonius experiment Better performance for Turbine Savonius with endplate, two blades, No overlap etc. 9 Triyogi et al (2018) Savonius experiment & 2D numeric The installation of the curtain in fron of the blade for specified S/D and Reynolds number fall down the performance up to 60 %

5. I S S T Blade Diameter ( D ) : 152.4 mm Diameter of turbine Savonius ( Ds ) : 284.8 mm Diameter of endplates ( De ) : 320 mm Overlap Diameter ( b ) : 19 mm Bluffbody Diameter ( d ) : 76.2 mm Height of turbin Savonius ( Hs ) : 300 mm Height of bluffbody ( h ) : 500 mm Endplate thickness ( te ) : 1 mm Bluffbody

6. I S S T Bluffbody Schematic diagram of experimental set-up (dimensions: mm ) Due to time consuming consideration All the measurement devices detail , please refer to the script.

7. I S S T Compared to conventional Savonius wind turbines the placement of a I-65 o type cylinder effective for improving turbine performance. Evolution Cp of turbine as function of ( λ ) , S/D = 1.4 & Re = 127.000 demonstrated in figure CP with I-65 o cylinder type increase to 25.66 %, ( λ ) = 0.76.

8. I S S T This figure demonstrates that the improvement torque coefficient is observed throughout for all values of tip speed ratio compared to the conventional Savonius turbine. This figure shows that torque coefficient ( C m ) is even higher for lower tips-speed ratio ( λ ) values and significant increase for placement I-65⁰ type cylinder bluffbody S/D = 1.4.

9. I S S T This figure shows Ts as function of the angle ( θ ), Re = 127.000, and in comparison between Ts conventional turbine and with I-65⁰ type cylinder for distance S/D = 1.4. The Result has positive effect increase starting capability. negative torque region disappeared by I-65⁰ type S/D = 1.4, with minimum value of Ts higher than 0.2.

10. No. DESCRIPTION AUTHOR COMMENTS 1 Triyogi et al (2009) Eksperimental Bluffbodi tipe I-65 ⁰ reduce Cd ↓ Endplate increase performance rope brake dynamometer wind tunnel subsonic blockage effect phenomenon. I S S T Earlier Study as Refference Material

11. I S S T No. DESCRIPTION AUTHOR COMMENTS 2. Aiba and Watanabe (1997) Experiment Bluff body D and I type Varying the Cylinders Dia. 20 mm & 30 mm Varying cutting angle θs = ⁰ , 36.9 ⁰ , 45.6 ⁰ , 49.5 ⁰ , 53 ⁰ , 56.6 ⁰ , 60 ⁰ , 66.4 ⁰ dan 72.5 ⁰ Cutting angle 53 ⁰ Optimal shape to decrease Cd dan Cp Earlier Study as Refference Material

12. Earlier Study as Refference Material No. Topik Peneliti Komentar 3. Mohamed et al (2010) Simulasi CFD Plat datar pengganggu aliran upstream CoP meningkat Turbin tanpa end plates Menggunakan simulasi CFD 2-D Variasi blade fullness Reynolds number tetap 2. Gunawan S. (2018) Eksperimental End Plates Rope Brake Dynamometer Simulasi numerik 3D Realizable k-Ꜫ Turbulence Model Enhanced wall treatment