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

浒苔附着力及其对海洋浮力面空化、动态响应和性能特征的影响的研究

• 批准号: 9713110
• 负责人: Sathya Gangadharan
• 金额: $ 30.45万
• 依托单位: Embry-Riddle Aeronautical University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713110&HistoricalAwards=false
• 关键词: Investigation; Adhesion; Enteromorpha; clathrata; Consequent

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. ***

9713110 Gangadharan国家科学基金会授予的前两项研究赠款导致：（i）了解Enteropmorpha clathrata的粘附特性及其对平板流体动力阻力的影响;（ii）在海港海洋研究所分支设计、建造和运营一条具有成本效益的水洞，和（iii）对有和无结垢的翼型上的流动特性（升力、阻力和俯仰力矩）的实验和理论研究。 本研究是上述工作的延伸，其目的是：首先，继续研究浒苔在水翼上的附着，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，建立了网格Enteromprpha clathrata在水翼表面的污垢的详细理论模型，使用激光多普勒测速仪（LDV）系统在水洞中对水翼进行广泛的实验测试，使用响应面方法从实验结果开发模型，并将从理论和实验获得的结果相关联，第三，从理论上研究船体结垢对螺旋桨振动和噪音。 这项为期3年的研究项目将分为三个阶段：第一阶段（第一年）：涉及使用激光多普勒测速仪（LDV）在海港分支海洋研究所的水洞设施周围的流动特性的研究。 第二阶段（第二年）：涉及污垢对空化的影响的调查。 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系统将用于描述海港海洋研究所分支的流型。 第三阶段（第三年）：努力将主要集中在通过诱导生物生长或通过诱导空化去除/最小化海洋表面上的生物生长来达到生物材料特性与空化之间的关系。 ***