The Evaluation and Preliminary Design of Adapting Pump Jet on Fishing Boats

• Main Authors: Mao-Bin Yeh, 葉茂彬
• Other Authors: Jeng-Horng Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/31706000541967873541

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 96 === Boats, especially fishing boats, sailing in shallow water usually encounter tangling problem. Current Taiwanese fishing rafts/boats and many ring net fishing vessels all face this problem. The present objective is to evaluate the possibility of installing pump jet on fishing vessels, including simulation of flow field near the pump jet, comparison with traditional propeller on issues of tangling, and life-cycle cost for typical Taiwanese fishing methods. This study found that pump jet’s inflow velocity affect all flow field when in shallow water; pump-jet almost avoids tangling problem；rim-driven propellers can easily clean tangled material by reversing operation or different speed, and can still operate even when ropelike material stuck with the blades. Both are better than traditional propellers. Without the consideration of indirect benefit of less tangling situations, the installation of pump jet on American style purse seine ships as subsidiary propulsion, small boat power, or maneuvering device (replacing rudder), will all delay the balance of cost and benefit for only a slight level. The effect is smaller to the change of fuel price. The preliminary design of the small boat makes its stability decline, while American style purse seine has no significant change.