Developing an Innovative Propulsion System Operating in Shallow Water

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Project title

Code/計畫編號

MOST108-2622-E019-006-CC2

Translated Name/計畫中文名

新型態淺吃水推進系統開發

Project Coordinator/計畫主持人

Jui-Hsiang Kao

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=13238075

Year

2019

Start date/計畫起

01-11-2019

Expected Completion/計畫迄

31-10-2020

Bugetid/研究經費

1940千元

ResearchField/研究領域

機械工程

對於有淺吃水要求之船舶，一般皆採用噴水式推進系統或直徑偏小之螺槳。但噴水式推進系統造價昂貴，對低速行駛之快艇會有效率不佳、艉橫板附近因為噴射夾帶作用產生低壓區而增加生額外動壓阻力、下沉與俯仰變化，導致艉橫板沒水面積較大而增加靜壓阻力等問題，因此僅適用於高速快艇。直徑偏小之螺槳則效率低，斜軸角度容易過大造成推力減損、額外之振動與噪音，且安裝於淺吃水船殼外易和周圍環境碰觸而損壞。此新型態之推進系統將於船體底部挖艉隧道，於管隧內置一導罩，於導罩內設計一導流翼。此裝置不但不會有噴水式推進系統於低速時推進效率減低、阻力增高與高成本之問題，且更能降低斜軸太大的不良影響提高推進系統效率、有效控制空蝕現象、降低振動與噪音、回收螺槳旋轉動能，另一方面原來之軸架可以不須安裝，減少附屬物阻力。此一新型態推進系統將先以升力線理論與計算流體力學(CFD)技術進行設計與自推模擬，其中將設計兩只螺槳，一只螺槳搭配導流翼，另一只則無，兩組推進系統會於海洋大學空蝕水槽測試性能、觀測空泡、量測激振力，並比較有無導流翼之差別。此計畫完成後將建立完整設計方法，成功取代噴水式推進系統，提高國內造船廠國際競爭能力，亦協助國內推進系統製造商開拓更大之市場。 For the shallow-draft ships, waterjet propulsions or small-diameter propellers are generally used. However, some drawbacks appear in the application of the waterjet propulsion. The cost of the waterjet propulsion is high. At low ship speeds, the efficiency is brought down due to the head loss, and both the hydrodynamic and hydrostatic resistances are increased. The hydrodynamic resistance is caused by the jet entrainment which reduces the hydrodynamic pressure at the transom and the hydrostatic resistances is due to the increased transom submergence by sinkage and trim. If small-diameter propellers is used in shallow-draft ships, the efficiency is remarkably low and the inclined shaft angle will result in unexpected vertical force and thrust decrease.The aim of this project is to develop an innovative propulsion system to replace the waterjet propulsion. The stern space will be reformed by the tunnel. The propeller with nozzle will be mounted in the tunnel, and a stator will be installed in front of the propeller. The new propulsion system is of low coat and resistance, and can attain high efficiency at low ship speeds. Besides, it is believed that this new system also can control the cavitation well to prevent from the unexpected noise and vibration. The developed new system will simulated by CFD; then, be verified by experiments in NTOU cavitation tunnel. Meanwhile, two propellers are design. One propeller will be equipped with the stator, and the other one will be not. The system without the stator will also be tested in the cavitation tunnel to confirm the difference due to the stator.

Keyword(s)

淺吃水
噴水式推進系統
艉橫板
艉隧道
導罩
導流翼
空蝕水槽
shallow draft
waterjet propulsion
transom
tunnel
nozzle
stator
cavitation tunnel

DSpace CRIS

Developing an Innovative Propulsion System Operating in Shallow Water

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