Investigation of Self-Propulsion Simulation for Submarine in Different Sailing Conditions-2

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Project title

Code/計畫編號

MOST104-2745-E019-001

Translated Name/計畫中文名

探討不同航行狀況下水下載具自推時的流力特性-2

Project Coordinator/計畫主持人

Yi-Chih Chow

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

辛敬業
王偉仲
黃維信
鍾孟軒

Department/Unit

Department of Systems Engineering and Naval Architecture

Year

2015

Start date/計畫起

01-05-2015

Expected Completion/計畫迄

01-03-2016

Co-Investigator(s)

Ching-Yeh Hsin

Bugetid/研究經費

2200千元

ResearchField/研究領域

機械工程

本計畫將應用計算方法探討水下載具在不同航行狀況下達到自推時的相關流體力學問題，探討的相關流力問題包含受力與流場細節。計畫將分為三個子題進行，一是水下載具自推模擬：探討如何應用計算方法模擬模型與實尺寸水下載具的自推點，將應用體積力方法進行載具與螺槳的交互作用模擬，而由於計算量相當大，並將對於計算進行平行化的研究。子題二是細節流場影響探討：將進行水下載具細節流場，尤其是不同渦系形成與發展的模擬與探討。第一年主要探討帆罩與接合面之馬蹄渦與其尾端之尖渦的形成與發展；而其後對控制翼所形成之渦系在自由液面影響下的渦系發展進行研究。此項子題並將探討渦系影響螺槳入流所造成流體誘導噪音的問題。我們將對於計算結果進行數值與資料的驗證。子題三是載具局部關鍵實驗：將發展技術量測關鍵的載具局部流場，以期與計算結果進行驗證與修正。第一年將發展以TR-PIV 為基礎，並以質點追蹤測速法增加空間解析度之技術，以期待發展出一套可精密地測量瞬時流場與壓力場之方法與系統。其後將配合立體式拍攝測量代表控制面與帆罩的翼型與首型模型流場。相信透過計算與實驗，就水下載具最基本卻複雜的自推進行研究，將可更深入了解水下載具的水動力特性。" "The objective of this proposal is to investigate the flow characteristics of underwater vehicle at self-propulsion point in different inflow conditions. This research includes the predictions of both forces and detailed flows. Three subjects are included in this project. The first one is to simulate the self-propulsion of an underwater vehicle, and both the model scale and full scale vehicles will be investigated. The body force method is used to compute the interactions between the hull and the propeller. Development of novel parallel algorithms in computations will be carried out to efficiently compute the unsteady flow problems. Subject 2 is to compute the detailed flow around the underwater vehicle, especially to study the formation and development of different vortex systems. The juncture vortex at the junction of sail and hull, along with the tip vortex of the sail will be investigated in the first-year project. The vortex systems of control surfaces and the influences of the free surface to vortex systems will then be studied in the following years. The flow induced noise due to propeller inflow affected by these vortex systems will also be evaluated under this subject. Notice that both verifications and validations will be made for all computational results. The subject 3 is to develop technique to measure the local flow field of underwater vehicles, and the experimental data will be used to validate the computational results. The Time-Resolved Particle Image Velocimetry (TR-PIV) will be developed, and then advance it with the Particle Tracking Velocimetry (PTV) to effectively increase the spatial resolution of the measurement. We expect to accomplish a measurement methodology and system that is capable of obtaining accurate and detailed data of instantaneous flow and pressure fields. The measurement methodology incorporated with the stereoscopic imaging to perform model experiments of foil section and head form, representing the sail and control surface and the bow of an underwater vehicle, respectively will be carried out in the following years. It is believed that we can understand more hydrodynamics of underwater vehicles by using both computational methods and experiments to investigate this fundamental and complicated self-propulsion problem.

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Investigation of Self-Propulsion Simulation for Submarine in Different Sailing Conditions-2

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