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題名 | Effects of Net Drag on Angle of Attack and Horizontal Spread in the Saucer-Shaped Otter Board=網具抗力對於圓型網板之攻角及水平展開的影響 |
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作者 | 林俊辰; |
期刊 | 臺灣水產學會刊 |
出版日期 | 19920900 |
卷期 | 19:3 1992.09[民81.09] |
頁次 | 頁223-230 |
分類號 | 439.3 |
語文 | eng |
關鍵詞 | 水平展開; 攻角; 圓型; 網板; 網具抗力; Otter board; Angle of attack; Horizontal spread; Net drag; |
中文摘要 | 利用荷重變化網具之抗力,以瞭解彎曲度15%之圓型網板的攻角及水平展開是否受其影響,所用網板之直徑為27.1cm,縮小比例為四分之一。試驗係於流速0.40m/sec及水溫11-12.8°C之條件下進行,所使用之荷重為0.93-6.5kgw,利用三分力計、張力計測定網板、網具之抗力及展開力,網板之攻角及水平展開係利用相機於網板上方拍攝之相片加以量測而得。 測得之實際攻角幾乎與設計攻角相同,經變方分析結果,得知實際攻角與設計攻角之差異亦不顯著。曳綱在弧鐵(Bracket)及手綱在諾曼(Normans)上之位置固定不變時,網板之水平展開係隨著網具抗力之增加而減少,在網具抗力與網板展開力之比大於135以上時,網板之水平展開則接近於零。 |
英文摘要 | A saucer-shaped otter board with a camber of 15% was used to test whether the angle of attack and horizontal spread of the board was altered as net drag changes with load. The board was made on a scale of 1/4 with a diameter of 27.1cm. The experiment was conducted at towing speed of 0.40m/sec and water temperature 11-12.8°C. The load used was between 0.93-6.5kgw. The drag, spreading force of the board and the net were measured with a three-component load cell and two gauges. The angle of attack and horizontal spread of the otter board were analyzed from the photographs taken above the otter board. The observed attack angles of the board measured by photographs were almost the same as the theoretical angles calculated from the positions of bracket and Normans on the board when the drag of net was varied. From ANOVA, it is clear that the observed attack angles are not significantly different from the theoretical angles of the board. The horizontal spread of the otter board decreased with the increase of the drag of net when the linking positions of a warp on the bracket and hand ropes on the Normans were the same. The horizontal spread of the board will be close to zero when the ration of the drag of net to the spreading force of the board is greater than 135. |
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