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題名 | Hydrodynamics Characteristics of Slotted Saucer-Shaped Otter Boards=槽洞圓型網板之力學特性 |
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作者 | 林俊辰; 蘇偉成; 周耀烋; |
期刊 | 臺灣水產學會刊 |
出版日期 | 19940300 |
卷期 | 21:1 1994.03[民83.03] |
頁次 | 頁1-10 |
分類號 | 439.3 |
語文 | eng |
關鍵詞 | 槽洞網板; 展抗比; 壓力中心係數; 攻角; Slotted otter board; Sheer-drag ratio; Coefficient of peressure centre; Angle of attack; |
中文摘要 | 為改進圓型網板之力學特性,本研究利用直徑30.7cm與彎曲度10%之單槽洞、 雙槽洞及無槽洞的圓型網板,於雷諾數0.95X105∼3.6x105,及水溫21.2∼22.7°C之條件 下,進行水槽試驗,攻角之變化範圍為0∼40℃。單槽洞及雙槽洞圓型網板於攻角25∼32° 時,其抗力係數均較無槽洞網板為小,單槽洞及雙槽洞網板在最大展開力係數時,其攻角分 別較無槽洞網板增加4°及6°,而攻角在20∼35°時,單槽洞及雙槽洞網板之展抗比亦均 較無槽洞網板為大。另就最大展抗比及最大展抗比時之攻角前後各5度範圍內的平均展抗比 作為網板效能之判斷,及以最大展抗比之75%的攻角範圍大小及壓力中心係數於最大展抗比 時之攻角前後各5度的變異係數作為網板穩定性之判斷時得知,雙槽洞網板之力學特性較單 槽洞網板為佳,而單槽洞網板則優於無槽洞網板。 |
英文摘要 | To improve the hydrodynameic characteristics of the saucer-shaped otter boards, the experiments were done with the one-slotted, two-slotted and unslotted otter boards measuring 30.7 cm in diameter with a camber of 10% in the conditions of Reynolds' number 0.95 x 105-3.6 x 105 and water temperature 21.2-22.7℃. The attack angle used was between 0 and 40°. The drag coefficients of one-slotted and two-slotted boards were less than that of unslotted board at the attack angles of 25-32 degress. The angles of attack at the maximum sheer coefficient of one-slotted and two-slotted boards increased 4 and 6 degrees more than that of unslotted board respectively. The two-slotted saucer shaped otter board is better than one-slotted board, and the one-slotted board superior to the unslotted board in hydrodynamic characteristics when judging from the efficiency and stability of otter board. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。