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

由美国国家科学基金会（National Science Foundation）资助的两项研究成果：(i)了解了笼形Enteropmorpha clathrata的粘附特性及其对平板水动力阻力的影响；（ii）在港科海洋研究所设计、建造和操作一条经济有效的水洞，以及（iii）对受污染和未受污染的水翼的流动特性（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延伸，目的是首先，继续研究笼形Enteropmorpha clathrata在水翼上的粘附，随后对流场空化的影响，以及水翼和船用螺旋桨的水动力响应特性；其次，建立了水翼船水翼表面结垢的详细理论模型，利用激光多普勒测速仪（LDV）系统对水翼船进行了广泛的实验测试，并利用响应面方法从实验结果中建立了模型，并将理论和实验结果相关联。第三，从理论上研究了船体结垢对螺旋桨振动和噪声的影响。这个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的激光多普勒测速仪（LDV）研究受污染的水翼表面周围的流动特性。第二阶段（第二年）：研究污垢对空化的影响。水翼模型将被视为螺旋桨的单个叶片，并允许空化与污垢。LDV系统将用于表征海港分部海洋研究所的流型。第三阶段（第3年）：主要致力于通过诱导生物生长，找出生物材料特性与空化之间的关系，或通过诱导空化，消除/减少海洋表面的生物生长。＊＊＊

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. ***