RANCANG BANGUN DAN STUDI EKSPERIMENTAL PENGARUH PERBEDAAN JARAK PITCH DAN KEMIRINGAN POROS TERHADAP KINERJA MEKANIK MODEL TURBIN ULIR 2 BLADE PADA ALIRAN HEAD RENDAH

• Main Authors: , YUL HIZHAR, ST, , Dr. Ir. Bambang Yulistianto
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2012
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/97812/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54527
• Institution: Universitas Gadjah Mada

Screw turbine uses low head and high flow rate of water to generate rotation speed. Screw turbine has many advantages such as simple in construction and installation, low cost in operating and maintenance, and fish-friendly. The influencing parameters to mechanics performance of screw turbine are pitch distance and the shaft slope. The purposes of this research are to design 2-blades screw turbine model and to test the influence of pitch distance variation and shaft slope to mechanics performance in laboratory. This research used experimental method which each of screw turbine model with pitch of 2Ro, 1.6Ro, and 1.2Ro were tested in variation of shaft slope of 25*, 30*, 35*, 40*, and 45*. The water flow rate was 0.00728 m 3 /s. The data was acquisitioned at Hydraulics Laboratory Civil Diploma Universitas Gadjah Mada. The result of testing without load showed that screw turbine model pitch of 2Ro had the higher rotation speed than pitch of 1.6Ro and 1.2Ro which the highest rotation speed was 255 rpm at shaft slope of 35*. The result of testing with load showed that each turbine produced the highest rotation speed and output power at the shaft slope of 35º, meanwhile the highest efficiency was produced at the shaft slope of 25º. The result of research showed that generally screw turbine model pitch of 2Ro produced the higher mechanics performance (output power dan efficiency) than pitch of 1.6Ro and 1.2Ro. At the shaft slope of 25º, pitch 2Ro produced power 15.89 W and efficiency 73.08% (the highest), meanwhile at the shaft slope of 35º, pitch 2Ro produced power 18.51 W (the highest) and efficiency 66.16%. These efficiencies result difference were caused by the influence of the difference of hydropower (input power) at the variations of the shaft slopes.