Performance Evaluation of Tracer Particles for Particle Image Velocimetry Using a Scaled Rolling Road-Tire Setup in a Wind Tunnel
1 online resource (60 pages) : PDF
University of North Carolina at Charlotte
The ultimate goal of the present work is to evaluate the ability to produce highlyresolved particle image velocimetry (PIV) flow images of tracer particles dispersedin a wind tunnel with a scaled rolling road-tire setup. The particle type, size, anddensity impact the instantaneous velocity profile measurement uncertainty. Threetypes of tracer particles including smoke, olive oil, and helium filled soap bubbles(HFSB) were used in this study. The experimental setup consist of a 1/10th scaledslick tire on a rolling road in a 0.3 m3 test section of an open-return eiffel wind tunnelwith a free stream velocity of 11 m/s. For PIV analyses in the present work, a dualpower Nd:YAG laser in conjunction with a sCMOS camera was used to provide a laserlight sheet to illuminate particles and obtain time resolved images of the flow field inthe test section. A commercial PIV software was used to analyze images and detectvortex formation. The experiments were conducted initially without a prototype inthe wind tunnel; i.e. empty tunnel testing and then with the tire inserted into the testsection. It was found that the HFSB seeding was not providing a consistent densitythroughout the test section. Comparing the olive oil and smoke for scaled tire testing,it was found that the olive oil yielded higher resolution images as compared to thesmoke tracer particles. Hence, the tests on the case study were conducted using oliveoil and smoke. An analogous behavior obtained from the empty channel testing fortwo seeding particles was observed in conducted tests on the case study.
PARTICLE IMAGE VELOCIMETRYSEEDINGTIRE AERODYNAMICSTRACER PARTICLE
Applied Energy & Electromechanical System
Hewlin Jr., RodwardTkacik, Peter
Thesis (M.S.)--University of North Carolina at Charlotte, 2018.
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