Investigation of the Energy Loss of Propellers in Ship Motions

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基本資料

Project title

Code/計畫編號

MOST105-2221-E019-016

Translated Name/計畫中文名

螺槳於船體運動時能量損失變化之探討

Project Coordinator/計畫主持人

Ching-Yeh Hsin

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

方銘川

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=11889817

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

01-07-2017

Bugetid/研究經費

728千元

ResearchField/研究領域

機械工程

"本計畫提出的主要目的是發展一評估螺槳在非定常流中，特別是船舶運動時能量損失的計算方法，以強化螺槳節能效益評估的能力，並更有效的進行螺槳節能的設計。所提計畫首先將發展非定常流中誘導速度計算的方法，建立與確認非定常流中能量損失係數的計算方法，並應用於螺槳於船艉跡流中能量損失計算，以探討跡流所造成能量損失的變化。接下來，將應用船舶運動程式計算船舶運動對於螺槳的影響，計算方法並將包含成大方銘川教授所發展的非線性時域三維朗肯小板法。由於計畫所應用的螺槳邊界元素法，亦是架構於朗肯方法上，因此我們亦將探討結合二程式，直接計算相互速度勢影響的可能性。在獲得船舶運動對於螺槳影響的資訊後，將計算螺槳於不同船舶運動時的能量損失係數，並探討波浪對於能量損失變化的影響。最後，計畫將應用以上非定常流的能量損失係數計算方法於具端板效應的非傳統螺槳，並與傳統螺槳進行比較。此次所提出的計畫，最重要的是針對於能量損失係數在非定常流中的計算，希望發展一穩定的計算方法評估不同的螺槳在非定常流中的性能表現，尤其是節能螺槳於非定常流中是否仍具有節能的特性，相信對於“能源效率設計指標”的評估計算，以及船舶節能減碳可帶來一定的績效。" "The objective of this proposal is to develop a computational method for the propeller energy loss in unsteady flows, especially in ship motions. It will enhance the ability to evaluate the propeller energy-saving performance and the effectiveness of energy-saving designs. In the proposed project, the computation method of propeller induced velocities in unsteady flow will first be developed, and the computation of energy loss coefficient in unsteady flow will be established and confirmed. This method will then be applied to the computations of propeller energy loss in ship wakes, to understand the characteristics of propeller energy loss in ship wakes. The ship motion effects to the propeller is then computed by different methods, and one of the method will be the nonlinear, time domain, three-dimensional Rankine Panel Method developed by Prof. Fang, Ming-Chung at NCKU. Since this method and the propeller boundary element method used in this project are both Rankine type methods, the influence to each other can possibly be compute by incorporating two codes. Once we can obtain the influence of the ship motions to propellers, the propeller energy loss can be evaluated for different types of ship motions. Finally, the energy loss coefficients of unconventional end-plate effect propellers will be computed, and results will be compared to the conventional propellers. The most important issue in the propose project is the computations of energy loss coefficients in unsteady flows, and to investigate the performances of energy-saving propellers in ship wakes and in ship motions. An accurate and stable computational method which can evaluate the causes and effectiveness of energy-saving propulsors in steady and unsteady flows will be established in this proposed project, and this method should be able to assist the design of energy-saving devices and evaluation of the Energy Efficiency Design Index (EEDI)."

Keyword(s)

節能螺槳
能量損失係數
船舶運動
邊界元素法
能源效率設計指標
energy-saving propeller
energy loss coefficient
ship motion
boundary element method
EEDI

DSpace CRIS

Investigation of the Energy Loss of Propellers in Ship Motions

基本資料

Description