Piv Measurements and Cavitation Imaging for the Flow on the Blade Surface of a Rotating Propeller

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基本資料

Project title

Code/計畫編號

MOST105-2221-E019-035

Translated Name/計畫中文名

旋轉螺槳葉片表面流場PIV量測與空化影像拍攝

Project Coordinator/計畫主持人

Yaw-Huei Lee

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=11877515

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

01-07-2017

Bugetid/研究經費

522千元

ResearchField/研究領域

機械工程

螺槳的表現深受其產生的空化現象以及周圍的紊流場之影響，而空化與紊流場之間又密切相關，故有必要進行螺槳空化現象與流場的測量。我們之前所進行的二維跨速度域螺槳翼型(Trans-Velocity Propeller Foil，TVPF)之質點影像測速法(Particle Image Velocimetry, PIV)測量，因受限於幾何維度(2D 模型）、流場型態(非預旋或誘發旋流)與低雷諾數，其數據對於TVP螺槳的表現僅能在趨勢上給予解釋，無法釐清螺槳幾何-旋轉流-紊流-空化之間的關係。因此本計晝欲建立一套可精確控制的相位鎖定 PIV (phase-locked PIV)，在螺槳旋轉到合適的角度時，將雷射光頁打入葉片表面附近的區域並同步拍攝質點影像以測量該區域之紊流場。完成PIV測量後，降低水槽壓力以引發葉片上產生空化，並利用同一套相位鎖定技術配合閃頻儀來進行空化影像拍攝。這兩種數據的獲得將可幫助我們釐清上述影響螺槳表現的各因子之間的關係，進而找出改善螺槳設計或空化數值模式之對策。 Due to the fact that the performance of a propeller depends considerably on the cavitation and the surrounding turbulent flow it generates, and that cavitation and turbulence have a close relationship, it is necessary to measure the cavitation and the flow field around a propeller. We have constructed a Particle Image Velocimetry (PIV) system, and used it to measure the flow structures and turbulence upon the Trans-Velocity Propeller Foil (TVPF). However, this experiment was limited in terms of dimensionality (2D model), flow type (not a pre-swirled flow or an induced swirl flow), and low Reynolds number, resulting in that its data can only explain the performance trend of the TVP without clarifying the relationships among the propeller geometry, the resulting swirl flow, turbulence and cavitation. Therefore, this project proposes to build a precisely-controlled, phase-locked PIV system to measure the turbulent flow field on the blade surface with synchronized laser-sheet lighting and particle imaging while the propeller is rotating to an appropriate angle. After finishing PIV measurements, we will reduce the pressure of the cavitation tunnel until cavitation occurs on the blade and use the same phase-locking technique with a stroboscope for imaging cavitation. Both data obtained will help us clarify the relationships among the aforementioned factors that influence the propeller’s performance, and improve the propeller design or the numerical models of cavitation.

Keyword(s)

相位鎖定
質點影像測速法
空化影像拍攝
旋轉螺槳
紊流場
phase-locked
Particle Image Velocimetry
cavitation imaging
rotating propeller
turbulent flow

DSpace CRIS

Piv Measurements and Cavitation Imaging for the Flow on the Blade Surface of a Rotating Propeller

基本資料

Description