Tracking characteristics of tracer particles for PIV measurements in supersonic flows |
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| Authors: | Chen Fang Liu Hong Yang Zifeng Hu Hui |
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| Institution: | 1. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USA;3. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA |
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| Abstract: | The tracking characteristics of tracer particles for particle image velocimetry (PIV) mea-surements in supersonic flows were investigated. The experimental tests were conducted at Mach number 4 in Multi-Mach Wind Tunnel (MMWT) of Shanghai Jiao Tong University. The motion of tracer particles carried by the supersonic flow across shockwaves was theoretically modelled, and then their aerodynamic characteristics with compressibility and rarefaction effects were evalu-ated. According to the proposed selection criterion of tracer particles, the PIV measured results clearly identified that the shockwave amplitude is in good agreement with theory and Schlieren visu-alizations. For the tracer particles in nanoscales, their effective aerodynamic sizes in the diagnostic zone can be faithfully estimated to characterize the tracking capability and dispersity performance based on their relaxation motion across oblique shockwaves. On the other hand, the seeding system enabled the tracer particles well-controlled and repeatable dispersity against the storage and humidity. |
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| Keywords: | Particle Image Velocimetry (PIV) Seeding Supersonic flow Tracers Tracking characteristics |
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