Romzi, Muhammad Hani (2025) Analisis Performa Perubahan Bentuk Casing dan Variasi Jumlah Bilah Turbin Air Crossflow Menggunakan Computational Fluid Dynamics (CFD). (Studi Kasus Pltmh Ranu Klidungan Grati Pasuruan). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Turbin Air Tipe Crossflow dinilai cocok untuk digunakan pada perairan Indonesia yang memiliki head rendah, yang kemudian digunakan untuk memutar generator dan menghasilkan listrik. Menentukan konfigurasi turbin air yang optimal, dan meningkatkan kinerja turbin, yang diharapkan berupa data kualitatif dan kuantitatif dari hasil validasi data eksisting dan modifikasi casing pada jumlah bilah 8 serta variasi jumlah bilah 6, 10, dan 12 dengan analisa secara numerik agar mendapatkan performa terbaik. Data kuantitatif meliputi daya turbin, daya air, torsi, efisiensi, Coefficient of Power, dan Tip Speed Ratio beserta grafiknya. Selain itu, ditampilkan juga visualisasi data kualitatif berupa kontur tekanan, kontur dan vektor kecepatan sepanjang aliran yang dilalui fluida. Salah satunya menggunakan CFD dengan software yang tersedia yaitu Ansys Workbench. CFD dapat membantu menyelesaikan banyaknya parameter bebas yang terlibat serta mengurangi besarnya biaya dan waktu yang dibutuhkan selama melakukan proses trial and error. Hasil analisis menunjukkan bahwa penambahan plat pada casing turbin crossflow memberikan dampak positif terhadap efisiensi sistem. Plat ini berfungsi mengurangi turbulensi dan separasi aliran, serta meningkatkan kestabilan putaran turbin. Selain itu, analisis variasi jumlah bilah menunjukkan bahwa peningkatan jumlah bilah dapat meningkatkan efisiensi turbin hingga titik tertentu. Namun, terdapat batas optimum terhadap jumlah bilah, karena penambahan yang berlebihan dapat menimbulkan gangguan aliran dan meningkatkan hambatan fluida. Hasil perbandingan antara jumlah bilah 6, 8, 10, dan 12 menghasilkan bahwa jumlah bilah 12 memiliki performa lebih tinggi, pada putaran 90 rpm dengan torsi 84,8 Nm, daya turbin 798,82 Watt dengan efisiensi 32,09 %.
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The Crossflow Type Water Turbine is considered suitable for use in Indonesian waters which have low head, which is then used to rotate the generator and produce electricity. Determining the optimal water turbine configuration, and improving turbine performance, which is expected in the form of qualitative and quantitative data from the results of validating existing data and casing modifications at the number of blades 8 and variations in the number of blades 6, 10, and 12 by numerical analysis in order to get the best performance. Quantitative data includes turbine power, water power, torque, efficiency, Coefficient of Power, and Tip Speed Ratio along with graphs. In addition, qualitative data visualization is also shown in the form of pressure contours, contours and velocity vectors along the flow through the fluid. One of them uses CFD with the available software, Ansys Workbench. CFD can help resolve the many free parameters involved and reduce the amount of cost and time required during the trial and error process. The analysis shows that the addition of a plate to the crossflow turbine casing has a positive impact on system efficiency. The plate reduces turbulence and flow separation, and increases the stability of the turbine rotation. In addition, the analysis of the variation in the number of blades shows that increasing the number of blades can increase the efficiency of the turbine up to a certain point. However, there is an optimum limit to the number of blades, as excessive addition can cause flow disturbance and increase fluid resistance. The results of the comparison between the number of blades 6, 8, 10, and 12 resulted in that the number of blades 12 had a higher performance, at 90 rpm with a torque of 84,8 Nm, the turbine power was 798,82 Watts with an efficiency of 32,09%.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Turbin Air, Turbin Crossflow, Performa, CFD. Water Turbine, Crossflow Turbine, Performance, CFD. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | Muhammad Hani Romzi |
| Date Deposited: | 04 Aug 2025 04:36 |
| Last Modified: | 04 Aug 2025 04:36 |
| URI: | http://repository.its.ac.id/id/eprint/126430 |
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