M335468 八、新型說明： 【新型所屬之技術領域】 • 本創作係有關一種擁有可抑制空化現象產生之前緣扭曲的船用舵，其 可抑制舵板表面空化現象之發生，因而降低空化現象對舵板的侵蝕，避免 維護費用的增加。 【先前技術】 以往一般舵的空化現象（cavitation)並不特別受到重視，直到近年 • 來大型貨櫃輪出現，以裝載量8000TEU等級的貨櫃輪為例，其船長可超過 330米，馬力可達9萬匹馬力以上，螺槳負荷較以往增加許多，螺紫後方水 流速度加快，使㈣空化現象特別嚴重，目前—般船廠對應空化現象的作 法並非抑制空化現㈣纽，而是在料產生空化驗置加裝不銹鋼板保 護’足個方式沒有改善空鋪現象，只能延長需要維修保養的週期，而且 會增加額外的重量。 【新型内容】 • 本齡之構想纟妓㈣舰純錢經職加速後，水流進入般的 攻賴化量’將㈣前緣扭曲，使_實際遭遇人流攻錄—她更小。 根據舱的^化實驗及數值計算結果，在顧後林同_高位置，舱的入 流攻角約有0度到7度的入流攻角變化，因此在〇度蛇角的情況，航實際 遭遇的入流攻角約為0度到7度之間，攻角越大容易產生局部低壓區造 成空化現象。本細刪斷面之麵預先轉攻肖，私部份斷面扭轉 之比例依舰碰方人流攻舰化情況的計算結果決定，絲前緣由於各 斷面預先扭轉的攻角不-致’而成-扭曲的平滑的轉。前緣扭她實際 5 M335468 逡遇的入流攻角是入流攻角減去預先扭轉攻角，因此舵的實際遭遇的攻角 較一般舵小，不易產生局部低壓區，有效抑制空化現象發生。 根據本創作之構想，前緣扭曲舱的製造方式與一般肋同，航的重量 不會增加，且實際抑制了空化效應的發生。 【實施方式】 餘配合圖式將本創作較佳之實施例說明如下。 蒼閱第圖’本創作圖。其中包含：_個般本體10在在不同的航斷面 位置具有不同肖度之預先扭轉攻肖’餘的前賴呈平滑細的線如正視 圖，於斷面A-A，該斷面翼形預先扭轉攻角㊀度，遭遇入流速度队流攻角 為度，該處實際遭遇之入流攻角為（㊀-α )度。 參閱第二圖，為現有之-般舱，在不同的般斷面位置航的攻角一致， 艇的前緣呈-絲，於斷面Β_Β，該斷面無預先扭轉攻角，遭遇入流速剡 入流攻角為α度，該處實際遭遇之入流攻角為^度。 參閱第三圖，本·前緣扭她與—_似_靖面細_崎面的壓力 分佈圖’前緣扭曲織-般舱_面積相同，在相同的絲位置，前緣扭 曲舱最強的低舰較-她低，本創作確實可以降低局部的低壓，進一步 抑制空化現象之產生。 穎 實 圍 綜上所述，當知本案所創作之「前緣扭曲蛇」已具有產業利用性、新 性及進步性，符合新料機件。_上所述者，僅為本創作之—較佳 施例而已，並非用來蚊本創作實施之範圍。即凡依本創作中請專利範 所做的均等變化與料，㈣本創作翻細所涵蓋。 6 M335468 【圖式簡單說明】 第一圖為前緣扭曲舵的三視圖。 第二圖為一般舵的三視圖。 第三圖為前緣扭曲舵與一般舵在A-A斷面與B-B斷面的壓力分佈圖。 【主要元件符號說明】 10舵 11舵的前緣 B 12舵的後緣 U入流速度 α入流攻角 0預先扭轉攻角 ΑΑ前緣扭曲舵的斷面 ΒΒ —般舵的斷面M335468 VIII. New description: [New technical field] • This creation is related to a marine rudder with a front edge distortion that can suppress cavitation, which can suppress the occurrence of cavitation on the rudder surface and thus reduce cavitation. Erosion of the rudder board to avoid an increase in maintenance costs. [Prior Art] In the past, the cavitation of the general rudder was not particularly taken seriously. Until recently, large container wheels appeared. For example, the container wheel with a load of 8000 TEU can be more than 330 meters long and the horsepower can reach More than 90,000 horsepower, the propeller load is much higher than before, and the water flow speed is increased after the spiral purple, which makes the (4) cavitation phenomenon particularly serious. At present, the shipyard's corresponding cavitation phenomenon does not inhibit the cavitation (4), but The material is produced with a cavitation inspection and is equipped with stainless steel plate protection. The footing method does not improve the emptying phenomenon, and only extends the period of maintenance and maintenance, and adds extra weight. [New content] • The concept of the age 纟妓 (4) After the ship's pure money has been accelerated, the water flow enters the likes of the attack. The (4) front edge is distorted, making the actual encounter with the stream - she is smaller. According to the cabin experiment and numerical calculation results, in the Gu Houlin with the _ high position, the inflow angle of attack of the cabin has an inflow angle change of 0 degrees to 7 degrees. Therefore, in the case of the twist angle, the actual encounter The inflow angle of attack is between 0 and 7 degrees. The larger the angle of attack, the more likely it is to cause localized low pressure areas to cause cavitation. The face of this detailed section is pre-transferred to Xiao, and the proportion of the torsion of the private part is determined by the calculation result of the ship's collision with the ship. The front edge of the wire is not caused by the pre-twisted angle of attack of each section. Made-twisted smooth turn. The leading edge twists her actual 5 M335468. The inflow angle of attack is the inflow angle of attack minus the pre-rotation angle of attack. Therefore, the actual angle of attack of the rudder is smaller than that of the general rudder, and it is not easy to generate a local low-pressure zone, effectively suppressing the occurrence of cavitation. According to the concept of this creation, the leading edge twist chamber is manufactured in the same way as the general rib, the weight of the air does not increase, and the cavitation effect is actually suppressed. [Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings. Cang read the picture 'this creation picture. The method includes: _ a body 10 having a different degree of shortness at different cross-section positions, and a smooth line such as a front view, in section AA, the section wing-shaped advance When the angle of attack is reversed, the angle of attack of the inflow velocity is encountered, and the angle of attack actually encountered at this point is (one-α) degree. Referring to the second figure, for the existing general cabin, the angle of attack is consistent at different general cross-section positions, the leading edge of the boat is - silk, and the section is Β _ Β, the section has no pre-rotation angle of attack, encountering the flow rate The intrusion angle of attack is α degree, and the inflow angle of attack actually encountered at this point is ^ degree. Referring to the third figure, the front edge twists her and the __like_jing face fine _ the surface pressure map of the 'shoulder edge twisted woven-like cabin _ area is the same, in the same wire position, the leading edge twist chamber is the strongest The low ship is lower than her, and this creation can indeed reduce the local low pressure and further suppress the occurrence of cavitation. Ying Shiwei In summary, when we learned that the “leading twisted snake” created in this case has industrial utilization, newness and progress, it is in line with the new material parts. The above is only the preferred embodiment of the present invention and is not intended to be used in the practice of mosquito creation. That is to say, according to the equal changes and materials made by the patent model in this creation, (4) the cover of this creation is covered. 6 M335468 [Simple description of the diagram] The first picture shows three views of the leading edge twisted rudder. The second picture shows the three views of the general rudder. The third picture shows the pressure distribution of the leading edge twisted rudder and the general rudder in the A-A section and the B-B section. [Main component symbol description] 10 rudder 11 rudder leading edge B 12 rudder trailing edge U inflow velocity α inflow angle of attack 0 pre-rotation angle of attack ΑΑ leading edge twisted rudder section ΒΒ - general rudder section