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Overview of High Speed Close-Up Imaging in an Icing Environment
| 题名： | Overview of High Speed Close-Up Imaging in an Icing Environment |
| 作者： | Miller, Dean R.; Lynch, Christopher J.; Tate, Peter A. |
| 关键词： | environment；overview；imaging；clos；speed；particle；high；capabilities；quantitative；impact |
| 摘要： | The Icing Branch and Imaging Technology Center at NASA Glenn Research Center have recently been involved in several projects where high speed close-up imaging was used to investigate water droplet impact splash, and also ice particle impact bounce in an icing wind tunnel. The combination of close-up and high speed imaging capabilities were required because the particles being studied were relatively small (d less than 1 mm in diameter), and the impact process occurred in a very short time period (t(sub impact) less than less than 1 sec). High speed close-up imaging was utilized to study the dynamics of droplet impact and splash in simulated Supercooled Large Droplet (SLD) icing conditions. The objective of this test was to evaluate the capability of a ultra high speed camera system to acquire quantitative information about the impact process (e.g., droplet size, velocity). Imaging data were obtained in an icing wind tunnel for spray cloud MVD greater than 50 m. High speed close-up imaging was also utilized to characterize the impact of ice particles on an airfoil with a thermally protected leading edge. The objective of this investigation was to determine whether ice particles tend to 'stick' or 'bounce' after impact. Imaging data were obtained for cases where the airfoil surface was heated and unheated. Based on the results from this test, follow on tests were conducted to investigate ice particle impact on the sensing elements of water content measurement devices. This paper will describe the use of the imaging systems to support these experimental investigations, present some representative results, and summarize what was learned about the use of these systems in an icing environment. |
| 报告类型： | 科技报告 |
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