Unsteadiness control of laminar junction flows on pressure fluctuations
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Smoke-wire flow visualization is conducted carefully in a laminar junction to explore the physical behavior of laminar junction flows. The two-dimensional (2D) velocity fields in the 30◦ plane of a laminar junction flow are acquired by a time-resolved particle image velocimetry (PIV) system at a frame rate of 1 kHz, based on which the unsteady fluctuating pressure fields can be calculated by the multi-path integration method proposed in the literature (GAND, F., DECK, S., BRUNET,V., and SAGAUT, P. Flow dynamics past a simplified wing body junction. Physics of Fluids, 22(11), 115111 (2010)). A novel control strategy is utilized to attenuate the unsteadiness of the horseshoe vortices of the laminar junction flow, and the consequent effect on pressure fields is analyzed.
Key wordsjunction flow horseshoe vortex pressure fluctuation flow visualization
Chinese Library ClassificationO357.4
2010 Mathematics Subject Classification76D17 76E09
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The authors would like to express her sincerely gratitude to the financial support of China Scholarship Council to conduct the research in Professor K. S. CHOI’s group of University of Nottingham (U.K.) and the National Key Laboratory of Science and Technology on Hydrodynamics.
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