Entwicklung eines Echtzeit 3-D PIV Systems zur Analyse instationärer aerodynamischer Phänomene im Insektenflug

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Many unsteady, three-dimensional (3-D) aerodynamic mechanisms used by insects to generate lift and thrust evade comprehensive understanding due to limitations in techniques available to investigate the flow field of air around the insect. Dynamic scaled robotic models have been developed to circumvent the problems of investigating aerodynamic phenomena of these small animals, which have high wing beat frequencies and complex wing beat kinematics. These robotic models include the development of a dynamically scaled hawkmoth 'flapper'1, with a smoke release mechanism from the wing's leading edge, and a dynamically scaled 'robofly' model of Drosophila, which was immersed in mineral oil, utilised air bubble seeding to enable two-dimensional (2-D) PIV and had a 2 axis force sensor to correlate fluid dynamics with force production2,3. However, as yet there are no methods available to map the flow field around either a free flying insect or a dynamically scaled model, in near real time 3-D. Here we propose a project to develop a real time 3-D PIV system, which makes use of chromatic filters to continuouusly illiminate the entire flow field. The project will be to develop a system based on 2 color viedo camers that can capture the entire flow field in one image, with individual light sheets identified by the use color to enable more rapid image capture through the flow field than is currently available. This system, in conjunction with models, methods and a sensor system already developed, will enable full inestigation into the highly 3-D flow characteristics of unsteady aerodynamic mechanisms such as 'delayed stall'1-5, 'wake capture'2-3 and aerodynamic effects of fore and hind wing interaction of free flying insects and in robotic wings6.