Investigation of the Adhesion of Enteromorpha clathrata and the Consequent Impact on Cavitation, Dynamic Response, and Performance Characteristics of Lifting Surfaces of Marine ...

9713110 Gangadharan国家科学基金会之前授予的两项研究资助导致：(I)了解枝形肠藻的附着特性及其对平板水动力阻力的影响；(Ii)在港湾海洋研究所设计、建造和运营具有成本效益的水洞；以及(Iii)对有污垢和未受污染的附水翼的流动特性(升力、阻力和俯仰力矩)进行实验和理论研究。目前的研究是对部分工作的扩展，目的是：一、继续研究枝叶蜈蚣在水翼上的附着、对流场空化的影响以及对水翼和船用螺旋桨的水动力响应特性；二、建立详细的理论模型；二、利用激光多普勒测速仪(LDV)对水翼在水洞中进行广泛的实验测试，利用响应面法根据实验结果建立模型，并将理论和实验结果进行关联；三、从理论上研究船体污垢对螺旋桨振动和噪声的影响。这项为期三年的研究项目将分为三个阶段：第一阶段(第一年)：使用海港分部海洋研究所水洞设施提供的激光多普勒测速仪研究受污染的水翼表面的流动特性。第二阶段(第2年)：调查污垢对汽蚀的影响。水翼模型将被视为螺旋桨的单个叶片，并允许带有污垢的空化。LDV系统将用于表征港湾分院海洋研究所的流型。第三阶段(第3年)：将主要集中努力通过诱导生物生长来确定生物材料特性与空化之间的关系，或通过诱导空化来消除/减少海洋表面上的生物增长。***

9713110 Gangadharan The two previous research grants awarded by the National Science Foundation led to: (i) understanding of the adhesion characteristics of Enteropmorpha clathrata and their consequent effects on the hydrodynamic drag of flat plates; (ii) the design, construction and operation of a cost- effective water tunnel at Harbor Branch Oceanographic Institution, and (iii) experimental and theoretical investigation of the flow characteristics (lift, drag and pitching moment) over fouled and unfouled bydrofoils. The current research is an extension of some of this work with the intention of first, continuing the investigation of the adhesion of Enteropmorpha clathrata on hydrofoils, subsequent impact on flow field cavitation, and hydrodynamic response characteristics on hydrofoils and marine propellers; secondly to develop a detailed theoretical model of Enteromprpha clathrata fouling on hydrofoil surfaces, perform extensive experimental testing on hydrofoils in the water tunnel using the Laser Doppler Velocimeter (LDV) system, develop a model from experimental results using response surface methodology and correlate the results obtained from theory and experiments and thirdly to theoretically investigate the impact of fouling of the hull on propeller vibrations and noise. This 3-year research project will be separated into three phases: Phase I (Year 1): Involves the study of the flow characteristics around the fouled hydrofoil surface using the Laser Doppler Velocimeter (LDV) available at the water tunnel facility at Harbor Branch Oceanographic Institution. Phase II (Year 2): Involves the investigation of the impact of fouling on cavitation. The hydrofoil model will be treated as a single blade of a propeller and allowed to cavitate with fouling. The LDV system will be used to characterize the flow patters at Harbor Branch Oceanographic Institution. Phase III (Year 3): Efforts will be primarily concentrated in arriving at a relationship between the biological material properties and cavitation by inducing biological growth or to remove/minimize the biological growth on marine surfaces by inducing cavitation. ***