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The Effect of Air Humidity on Shock Wave Induced incipient separation

Journal of Thermal Science 2000年第1期9卷 45-50页

作者： Piotr DOERFFER Andrzej SZUMOWSKI Shen YU Institute of Fluid Flow Machinery Polish Academy of SciencesPoland Warsaw University of Technology Poland Institute of Engineering Thermophysics Chinese Academy of Sciences China

During earlier research on shock wave/boundary layer interaction control, the effect of air humidity flow separation has been observed. This has inspired a more detailed study on the effect of air humidity on shock induced incipient separation and on the involved involved processes. The phenomenon has a twofold nature. In supersonic flow, the condensation of humidity causes flow retardation due to heat addition. The consequent weakening of the shock wave reduces the tendency towards separation. On the other hand, the incipient separation is postponed at the same Mach numbers of interaction.

关键词： shock wave/boundary layer niteraction incipient separation humidity effect.

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Feather Vibration as a Stimulus for Sensing incipient separation in Falcon Diving Flight

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Natural Resources 2016年第7期7卷 411-422页

作者： Christoph Brücker Daniel Schlegel Michael Triep Department Mechanical Engineering and Aeronautics City University London London UK Institute of Mechanics and Fluid Dynamics University of Freiberg Freiberg Germany

Based on our preceding studies on the aerodynamics of a falcoperegrinus in diving flight along a vertical dam it is known that even when the body shape of the bird is rather streamlined in V-shape some feathers tips may elevate in certain regions of the body. These regions were identified in wind tunnel tests for typical diving flight conditions as regions of locally separated flow. A life-size model in V-shape of a falcoperegrinus with artificial feathers fixed along the body was studied in a wind tunnel to focus on the fluid-structure interaction of feathers located in this sector. The distal ends of the feathers show flow-induced vibrations at typical flight conditions which grow linear in amplitude with increasing angle of incidence until incipient separation. In light of the proven existence of vibration-sensitive mechanoreceptors in the follicles of secondary feathers in birds it is hypothesized that this linear amplitude response offers the bird to sense the angle of incidence during the diving flight using the vibration magnitude as sensory stimulus. Thus the bird in streamlined shape has still a good measure to control its attitude to be in the narrow window of safe angle of incidence. This might have implications also for other birds or technical applications of airfoil sensors regarding incipient separation detection.

关键词： Falcon Dive Feather Vibration Sensory Stimulus incipient separation

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