Analisis Parameter Yang Memengaruhi Aliran Vortex Pada Gravitational Water Vortex Power Plant (GWVPP)

Carolina, Ester (2021) Analisis Parameter Yang Memengaruhi Aliran Vortex Pada Gravitational Water Vortex Power Plant (GWVPP). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

GWVPP dapat digunakan dalam aliran sungai dengan head yang rendah yaitu dari 0.8 meter
sampai 2 meter. Aliran vortex merupakan pola aliran di mana arusnya berupa lingkaran-
lingkaran konsentris dan partikel-partikel fluida tidak berotasi pada sumbunya sendiri
(irrotational flow). Performansi aliran vortex berupa vortex height, tangential velocity, dan
vortex strength memiliki pengaruh besar terhadap efisiensi turbin. Kekuatan free vortex yang
bersifat lemah menghasilkan profil vortex yang buruk, oleh karena itu dibutuhkan kekuatan
aliran vortex yang maksimal untuk pembangkit listrik GWVPP. Penelitian ini menggunakan
pendekatan Computational Fluid Dynamics untuk menganalisa pengaruh perbedaan basin
silinder dan conical, rasio diameter outlet terhadap diameter basin, perbesaran
ukuran basin, dan variasi nilai flowrate inlet terhadap performansi aliran vortex berupa
vortex height, tangential velocity, dan vortex strength. Pada penelitian ini didapatkan bahwa
performansi aliran vortex terbaik terjadi pada basin conical rasio 0.3 perbesaran 1.2
kali meskipun memiliki performansi vortex height yang rendah. Nilai flow rate inlet yang
baik di penelitian ini juga cukup kecil yaitu 2.65 kg/s.
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GWVPP can be used in streams with a low head from 0.8 meters to 2 meters. Vortex flow is
a flow pattern in which the flow is in the form of concentric circles and the fluid particles do
not rotate on their axes (irrotational flow). The performance of vortex flow in the form of
vortex height, tangential velocity, and vortex strength has a influence on turbine efficiency.
The weak free vortex strength results in a poor vortex profile, therefore maximum vortex
flow strength is required for GWVPP power plants. This study uses a Computational Fluid
Dynamics approach to analyze the effect of different cylindrical and conical basins, the ratio
of outlet diameter to basin diameter, basin size enlargement, and variations in inlet
flowrate values on vortex flow performance in the form of vortex height, tangential velocity,
and vortex. strength. In this study, it was found that the best vortex flow performance
occurred in the basin conical ratio 0.3 with 1.2X enlargement even though it had a
low vortex height performance. The value of a good inlet flow rate in this study is also quite
small that is 2.65 kg/s.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	vortex, vortex height, tangential velocity, and vortex strength, basin, conical, silinder
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ870 Hydraulic turbines.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Ester Carolina
Date Deposited:	30 Aug 2021 08:13
Last Modified:	30 Aug 2021 08:13
URI:	http://repository.its.ac.id/id/eprint/90724

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