Analisis Numerik Pengaruh Desain Kanal Inlet terhadap Performansi Aliran Vortex pada Gravitational Water Vortex Power Plant (GWVPP)

Swastika, Ni Putu Widya Laksmi (2023) Analisis Numerik Pengaruh Desain Kanal Inlet terhadap Performansi Aliran Vortex pada Gravitational Water Vortex Power Plant (GWVPP). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit Listrik Tenaga Mikrohidro (PLTMh) berpotensi untuk dikembangkan di Indonesia, salah satunya Gravitational Water Vortex Power Plant. Kualitas aliran vortex dipengaruhi beberapa parameter, antara lain kecepatan tangensial, vortex height, dan vortex strength. Pada penelitian ini, dirancang 2 tipe kanal, yaitu tipe kanal tangensial (variasi sudut 152°, 157°, 163°, 168°, 174°, 180°) dan tipe kanal wrap around (variasi sudut 90°, 112°, 135°, 158°, dan 180°). Studi numerik menggunakan Computational Fluid Dynamics (CFD) dilakukan untuk menganalisis parameter terkait. Terdapat 4 variasi flow rate yang digunakan yaitu 0.002, 0.004, 0.006, dan 0.008 m3/s. Terdapat beberapa parameter yang ditinjau, yaitu vortex height, air core, kecepatan, dan vortex strength. Pada kanal tipe tangensial dengan flow rate 0.008 m3/s, didapatkan peningkatan vortex height pada tipe E (174o) dengan tipe F (tanpa deflektor, 180o) yaitu 1.15%. Sedangkan antara tipe A (152o) dengan tipe E, peningkatan vortex height sebesar 8.02%. Pada kanal wrap around, peningkatan vortex height pada tipe G (90o) dengan tipe K (180o) yaitu 11.49%. Kecepatan tangensial memengaruhi bagaimana kekuatan sirkulasi atau vortex strength dari suatu aliran. Semakin mendekati pusat aliran, maka nilainya semakin tinggi. Berdasarkan simulasi yang telah dilakukan, didapatkan bahwa pada sudut masukan yang kecil menghasilkan kualitas aliran vortex yang lebih baik, karena terdapat peningkatan level ketinggian air. Sedangkan untuk perbandingan antar tipe kanal, didapatkan hasil bahwa kanal tipe wrap around menghasilkan kualitas aliran vortex karena aliran air memasuki basin secara melingkar, yang menciptakan pola aliran spiral dan mempermudah pembentukan vortex.

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Microhydro Power Plant (PLTMh) has the potential to be developed in Indonesia, one of which is the Gravitational Water Vortex Power Plant. The quality of vortex flow is influenced by several parameters, including tangential speed, vortex height, and vortex strength. In this study, 2 types of canals were designed, namely tangential canal type (angle variation of 152°, 157°, 163°, 168°, 174°, 180°) and wrap around channel type (angle variation of 90°, 112°, 135°, 158°, and 180°). Numerical studies using Computational Fluid Dynamics (CFD) are conducted to analyze related parameters. There are 4 variations of flow rate used, namely 0.002, 0.004, 0.006, and 0.008 m3/s. In the tangential type channel with a flow rate of 0.008 m3/ s, an increase in vortex height was obtained in type E (174) with type F (without deflector, 180) which was 1.15%. While between type A (152) and type E, the increase in vortex height was 8.02%. In the wrap around channel, the increase in vortex height in type G (90) with type K (180) is 11.49%. Tangential velocity affects how the vortex strength of a flow. The closer the flow center, the higher the value. But when it is at the center of the basin (r = 0), the value of the tangential velocity will be close to 0. Based on the simulations that have been carried out, it was found that at a small input angle it produces better vortex flow quality, because there is an increase in the water level level. As for the comparison between channel types, it was found that wrap around type channels produce vortex flow quality because the flow of water enters the basin circularly, which creates a spiral flow pattern and facilitates vortex formation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Basin Konikal, Kanal Wrap Around, Kecepatan Tangensial, Sudut Kanal Masukan, Vortex Height
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics 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:	Ni Putu Widya Laksmi Swastika
Date Deposited:	29 Jul 2023 08:24
Last Modified:	29 Jul 2023 08:24
URI:	http://repository.its.ac.id/id/eprint/99582

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