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題名 | Characteristics of Pressure Centre of Saucer-Shaped Otter Boards=圓型網板之壓力中心特性 |
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作者 | 林俊辰; |
期刊 | 臺灣水產學會刊 |
出版日期 | 19910600 |
卷期 | 18:2 1991.06[民80.06] |
頁次 | 頁133-143 |
分類號 | 439.3 |
語文 | eng |
關鍵詞 | 圓型; 網板; |
中文摘要 | 為瞭解彎曲度(camber)為0及10%之圓型網板在水中之壓力中心特性,利用縮小四分之一及直徑為27.1cm之模型,於雷諾數的8.5×104,水溫4~5.5℃之條件下,進行本實驗。於攻角0~30°之範圍內,每隔5°作網板攻角之變化,以三分力計測定各攻角時,網板受水流作用之抗力(D)、展開力(L)及力矩(MZ),求出抗力係數(CD)、展開力係數(CL)及力矩係數(CM)與攻角之關係,並求出力臂(h),而由垂直於力臂之合力(F)與網板交叉之壓力中心點,求出網板之壓力中心係數。 彎曲度10%之網板的展開力係數及抗力係數均分別大於彎曲度0%之網板。彎曲度10%之模型的力矩係數隨攻角之增加而逐漸增大,而彎曲度0%則變化較小。彎曲度0%網板之壓力中心係數隨攻角之增加而逐漸增大,而彎曲度10%之網板則有減小之現象。由圓型網板壓力中心之變異係數,可推知網板在攻角小於15°時之穩定性較攻角於20~30°時為低劣。 |
英文摘要 | The experiment was done with two kinds of saucer-shaped otter boards which are with cambers of 0 and 10% in order to understand the characteristics of the pressure center of the otter boards. The diameter of the models used is 27.1 cm and both are made on a scale of 1/4. The experiment was conducted in the condition of Reynolds' number 8.5×104 and of water temperature 4-.5℃, The attack angle used was between 0 and 30°. The drag, spreading force (horizontal lifet) and moment of the models that were acted by flow were measured with a three-component load cell. The relationship between the drag coefficient, horizontal lift coefficient, moment coefficient and attack angle were analyzed. The coefficient of pressure center was calculated from the intersectional position of the models and the resultant farce (F). The lift and drag coeeficients of the model with a camber of 10% are larger than those of the model with a camber of 0%. The moment coefficient of the model with a camber of 10% increases gradually with the increase of attack angle, but that of the model with a camber of 0% is almost the same. The coefficient of the pressure center of the model with a camber of 0% increases gradually with the increasing attack angle, but that of the model with a camber of 10% decreases. Form the coefficient of variation of pressure center, it seems that the stability of the otter board at an attack angel of between 20 and 30°is better than that with an attack angle of less than 15°. |
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