Fluid Flow Study in Various Shapes and Sizes of Horizontal Axis Sea Current Turbine

Abstract

The ducted tidal turbine models have been developed to utilize the conversion of the kinetic energy on ocean currents. The research in refining the turbine characteristics has been carried out by modifying the turbine’s shape and size. This study investigated flow characteristics in the meridional section of five ducted turbines models for seawater flow with velocity U0 = 1.5 m/s. The ducted turbine design and construction have five different impeller house diameters and fixed inlet and outlet diameters. The potential energy flow theory and experimental data are used to analyze the flow characteristics of the model. The results show that flow velocity in the x-direction at the inlet and outlet cross-section is getting smaller, reducing the impeller house cross section. Each impeller house size reduction increases the flow speed in the impeller house cross-section and also pressure on all other cross-sections tested. In the inlet area, the increased pressure indicates a decrease in speed flow and discharge coefficient value. The discharge coefficient value decreases from CQ = 0.9 at the diameter ratio of dr = 1 to CQ = 0.56 at the diameter ratio of dr = 0.375. The maximum value of power coefficient was determined at dr = 0,61÷0.73 or dr = 0.69 which is equivalent to average internal flow velocity Vr =2.0÷2.6 m/s and the static pressure ps = 97.1÷ 94.4 kPa. At the ratio value of D0/D2 = 0.83, the optimal diameter ratio dropt=0,61÷0.73 is in line with the duct model of case 3 and case 4, but it may be determined solely as for case 4.

Analisis Kinerja Termal Penukar Kalor Tube Bank Bare in-Line Aliran Silang Sebagai Pemulihan Limbah Panas Pengering Konvektif Rumput Laut

“…Meskipun demikian, pendekatan pertama untuk mengatasi masalah lingkungan dengan melakukan konservasi energi dan pengurangan emisi lebih lanjut sangatlah penting [13]- [20]. Pendekatan kedua dengan meningkatkan energi terbarukan, seperti energi matahari [21]- [24], energi biomassa [25]- [29], energi angin [30], energi geothermal [31]- [33], energi arus laut [34] dan energi hidrokarbon [35]- [37].…”

Kajian Perbandingan Performance Energi Turbin Angin Model Ducted Dengan Un-Ducted

“…Ada dua tipe turbin yakni Turbin Angin Sumbu Horizontal (TASH) [9][10] [11] [12] dengan Turbin Sumbu Vertical (TASV) [13][14][15] [16].…”

“…serta generator dan sistem control [10]. Turbin aksial horizontal saat ini telah berkembang menjadi turbin aksial horizontal tanpa selubung [9][10] [11][12] atau bare turbine [17] dan turbin horizontal dengan selubung [18][19] [20] yang memiliki prinsip kerja yang sama dengan ducted tidal turbine [11][17] [21][22] [23] [24].…”

“…Analisa dengan teori actuator disk diperluas untuk kasus yang lebih umum dari turbin angin dengan selubung, melalui pengenalan faktor induksi aksial baru a0 yang menjelaskan geometri dari diffuser yang diberikan. Aliran pada ducted wind turbin analogi dengan analisa ducted tidal turbine yang telah dilakukan dalam penelitian yang dilakukan oleh Lawn, 2013 [18], Belloni, 2013 [17], W. M Rumaherang, 2020 [26], W. M. Rumaherang et al, 2021 [11], Balasem et al, 2019 [27] Dari gambar 2 terlihat bahwa luas penampang disk pada sisi hulu (inlet) lebih besar dari luas penampang turbin, sehingga laju aliran dalam turbin akan semakin besar.…”

Experimental study of small hydro turbine propeller performance with a variety of blade angles of attack

“…However, the utilization of water turbines in Indonesia is still very low, around 10% [9]. Several studies on hydro turbines have been carried out to increase the power of the electricity, including modifying the shape and size of the turbine [10], combining the turbine model [11], and designing the electrical power storage system [12].…”