Tenaga angin merupakan salah satu sumber tenaga boleh diperbaharui yang sering digunakan di dunia kerana ia menyediakan sumber yang paling murah dan paling lestari. Di Malaysia, tenaga angin tidak banyak digunakan disebabkan oleh kelajuan angin yang sangat rendah dengan purata bulanan di sekitar 1.8 m/s hingga 3 m/s. Terdapat inisiatif yang sangat terhad untuk melaksanakan aplikasi turbin angin melalui pendidikan STEM (Sains, Teknologi, Kejuruteraan, dan Matematik) yang melibatkan pelajar dalam menguasai pengetahuan melibatkan tenaga angin dan kelestarian. Dalam projek ini, dua model turbin Savonius 2-bilah dan 3-bilah direka dan dibina untuk menjana elektrik. Rumah model dibangunkan dan digunakan sebagai sebahagian daripada kit turbin STEM untuk memberikan paparan visual cahaya LED, mekanisme pintu pagar, dan mekanisme muzik. Kajian eksperimental yang dijalankan dalam projek ini bertujuan untuk menyiasat dan menganalisis pengaruh bilangan bilah terhadap prestasi kuasa turbin. Prestasi dianalisis dari segi pekali kuasa πΆπ dan pekali daya kilas (πΆπ‘) berkenaan dengan nisbah kelajuan hujung (Ξ»). Turbin Savonius 3-bilah telah menunjukkan peningkatan nilai pekali daya daripada 2-bilah iaitu πΆππππ₯= 0.0035 pada Ξ» = 0.109. Pekali daya kilas, πΆπ‘ telah menurun ketika nisbah kelajuan hujung meningkat kerana peningkatan bilangan bilah menurunkan permukaan seret terhadap udara angin dan menyebabkan daya kilas terbalik menurun. Juga diperhatikan bahawa turbin 3-bilah menghasilkan kuasa pengeluaran tertinggi 1.28W pada kelajuan 38.8 m/s.
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Wind energy is one of the most common resources of renewable energy in the world that provides the lowest cost and very sustainable. In Malaysia, the wind energy is not widely implemented due to a very low wind speed with monthly average at around 1.8 m/s to 3 m/s. There is very limited initiative to implement the wind turbine applications through STEM (Science, Technology, Engineering, and Mathematics) education that can engage students in learning about the wind energy and sustainability. In this project, two models of a 2-bladed and 3-bladed Savonius turbines were designed and developed to generate electricity. This is a drag-driven vertical axis wind turbine with a model house as part of the STEM turbine kit was also fabricated and has the capability to display power by visual representation of LED light, sliding gate mechanism, and musical mechanism. The experimental study conducted in this project aims to investigate and analyze the effect of number of blades on turbine power performance. The performance was analysed in terms of coefficient of power (πΆπ) and coefficient of torque (πΆπ‘) with respect to the tip speed ratio (Ξ»). The 3-bladed Savonius turbine has demonstrated an increasing values coefficient of power in comparison to the 2-bladed where 3-bladed πΆππππ₯ is 0.0035 at Ξ» =0.109. The coefficient of torque, πΆπ‘ has declined as the tip speed ratio increased due to the increment number of blades that eventually decrease the drag surface against the wind air that causes the reverse torque to decrease. It is also observed that the 3-bladed turbine generated the highest power output of 1.28W at speed of 38.8 m/s.
The design and development of savonius turbine for science, technology, engineering & mathematics (stem) education / Nujjiya Abdul Muβin