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研究生:陳建志
研究生(外文):CHEN.CHEN-CHIH
論文名稱:碼頭岸壁前螺槳引致流場與底床淘刷試驗研究
論文名稱(外文):Experimental Studies On Propeller Induced Flow Fields and Bed Scouring In Front of Quay Walls
指導教授:臧效義臧效義引用關係
指導教授(外文):TZANG SHIAW-YIH
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:99
中文關鍵詞:螺槳淘刷速度
外文關鍵詞:PropellerScourVelocity
相關次數:
  • 被引用被引用:3
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本次試驗主要是利用平面水槽來模擬貨櫃船於港內時,螺槳運轉導致底床淘刷的試驗。試驗模型為六葉之2200TEU貨櫃船螺槳,比尺為1/30 ,試驗主要分為兩部分:流場量測與淘刷深度量測,流場部份主要是量測螺槳在不同轉速時,距離螺槳面不同間距之垂直軸向速度剖面分佈,並將試驗值與理論值相比較;而淘刷部分則是將各轉速及作用時間之淘刷深度值紀錄下來,探討其淘刷深度分佈現象。
在初始射流速度(Efflux Velocity Vo)方面,試驗值與EAU(1996)以及Fuehrer and Romisch (1977)所推算之Vo公式符合性相當高,而與Hashmi (1993)有些微差距。垂直軸向速度分布方面,Hamill (1987)的最大速度值及Hamill(1996)之理論曲線與吾人之試驗曲線相比較,可看出不同轉速時,在X=3Dp附近均有不錯之符合性,但在低轉速(如200RPM)時,軸心(Z=0)至最大值之間的範圍則與理論線有較大的差異。在最大速度的遞減現象中,發現到試驗值都有較理論值高的現象,且斜率大於理論值,唯有300RPM的試驗值較接近理論線。最大淘刷深度在不同轉速與時間作用之下皆落在2~3Dp之間,即螺槳水流的發展區末端與發展完成區之交界處。淘刷坑的斜率會隨著時間及轉速的增加而變陡,而且最大淘刷深度上游段坡度較陡,下游段較緩,淘刷的範圍隨轉速作用時間增加而逐漸向下游延伸。最後在最大淘刷深度隨時間變化的最適線中,可清楚得知變化呈指數型式,且大約在2小時後趨於一穩定狀態。
For this experimental study a plane basin was utilized to simulate the propeller-induced bed scouring due to a container ship with a model propeller of six blades. The experiments comprises of two key factors: the axial velocity and the scour for four rotational speeds of 200, 250, 300 and 350RPM, respectively. The measurements of the vertical distributions of axial velocity and profiles of scour depths at different motive time were compared with the theoretical values.
As a result, the measured efflux velocities Vo highly matches those calculated by Fuehrer and Romisch (1977) and by EAU (1996) but slightly differed with those by Hashmi (1993). The measurements of vertical distributions of axial velocity are found to well agree with Hamill (1987) on maximum velocities and with Hamill (1996) on vertical distribution profiles particularly near axial distance X of 3 times of the propeller diameter Dp. Greater differences in axial velocities are found at between the axis (Z=0) and location of maximum velocity in lower rotation speed, e.g. 200RPM. For decreasing trends of the maximum axial velocities along axial direction (X), the measured values are always higher than the theoretical values except for the case of 300 RPM.
The maximum scour depths usually occurred at distances of about between X= 2 to 3Dp for different rotation speeds and motive time near the zone boundary of flow establishment and established flow. The slopes of the scour holes became steeper with increasing motive time and greater rotational speeds while the scour ranges extended downstream. Furthermore, the fitting curves of the development of maximum scour depth with time are found to be exponential type approximating a steady limit as the motive time exceeding about 2 hours.
謝誌 I
摘要 II
ABSTRACT III
目錄 IV
圖目錄 VII
表目錄 XI
符號說明 XII
第一章 緒論 1
1.1研究動機 1
1.2研究目的 1
1.3研究方法 2
第二章 前人研究 3
2.1螺槳水流速度理論介紹 3
2.1.1螺槳水流初始射流速度(Efflux Velocity )方程式 3
2.1.2螺槳水流發展擴散型式 4
2.1.3螺槳水流模式﹝EAU,1996﹞ 7
2.2淘刷深度理論介紹 9
第三章 試驗設備與方法 11
3.1試驗設備 11
(一) 平面水槽 11
(二) 鋪砂設備 11
(三) 流速量測系統 11
(四) 淘刷深度量測系統 12
(五) 模型螺槳與驅動系統 12
(六) 試驗條件 13
3.2試驗砂與土槽 13
(一) 試驗砂 13
(二) 試驗土槽 14
3.3試驗配置 14
3.4試驗步驟 15
第四章 試驗結果分析與討論 16
4.1 速度場量測結果 16
4.2 淘刷試驗 19
4.2.1淘刷坑剖面 19
第五章 結論與建議 25
5.1結論 25
5.2建議 26
參考文獻 27
附表 30
附圖 39
個人簡歷表 99
1.Chattarjee. S. S., Ghosh. S. N. (1980). “Submerged horizontal jet over erodible bed. ” J. Hydr. Div, November. pp.1765-1781
2.Chin. O. C., Chiew. Y. M., Lim. S. Y., and Lim. F. H. (1996). “Jet scour around vertical pile.” J. Wtrwy., Port, Coast, and Oc Engrg., ASCE,122(2),pp.59-67
3.D. Ryan., Hamill. G. A., and Hughes. D. A. B. (2000). “A method for predicting velocities within the scour hole produced by a ship’s propeller in a harbour” Hydrodynamics IV, pp.629-634
4.Hamill. G. A., Johnston. H. T., and Stewart. D P. J. (1996). “Estimating the velocities in a ship’s propeller wash” P.I.A.N.C., Bulletin No.89 pp.46-54
5.Hamill. G. A., Qurrain. R. M. M., and Johnston. H. T. (1996). “The influence of a revetment on diffusion of a propeller wash” P.I.A.N.C., Bulletin No.91 pp.39-43
6.Hamill. G. A., Johnston. H. T., and Stewart, P. D. (1999). “Propeller wash scour near quay walls” J. Wtrwy., Port, Coast, and Oc Engrg., ASCE, pp.170-175
7.Hamill. G. A., D. Ryan., and Hughes. D. A. B. (2000). “Designing for Protection against Propeller-induced Erosion in Harbours” Hydrodynamics IV, pp.623-628.
8.Hamill. G. A., and Johnston. H. T. (1993). “The decay of maximum velocity within the initial stages of a propeller wash.” J. Hydr. Res., Delft, The Netherlands, 31(5),pp.605-613
9.Hamill. G. A., McGarvey. J. A., and Hughes. D. A. B. (2001). “The effect of rudder angle on the scouring action produced by the propeller wash of a manoeuvring ship” P.I.A.N.C., Bulletin No.106 pp.49-62
10.Hassan. N. M., Narayanan, R., (1985). “Local scour downstream of an apron.” J. Hydr. Engrg. Vol. Ⅲ,No.11., ASCE, pp.1371-1385
11.McGarvey. J. A. (1996) “The influence of the rudder on the hydrodynamics, and the resulting bed scour, of a ship’s screw wash” A Thesis submitted to The Queen’s University of Belfast for the Degree of Doctor of Philosophy.
12.Qurrain. R. M M. (1994)“Influence of the sea and bed geometry on the hydrodynamics of the wash from a ship’s propeller” A Thesis submitted to The Queen’s University of Belfast for the Degree of Doctor of Philosophy.
13.Rajaratnam. N. (1981). “Erosion by plain turbulent jets.” J. Hydr. Res., Delft, The Netherlands, 19(4) pp.339-358
14.Recommendations of the Committee for Waterfront Structures Harbours and Waterways EAU (1996) pp.236-243
15.Stewart. D. P. J., Hamill. G. A., and Johnston. H. T. (1991). “Velocities in a ship’s propeller wash” International symposium on environmental hydraulics,Hong Kong, pp.651-656
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