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SUMMARY:Particle-Based Measurements and Fluid Machinery Flows
DTSTART:20140326T140000
DTEND:20140326T150000
DTSTAMP:20260611T124212Z
UID:8ad099f727fa5b95ee7697f61e14dcb30899881ae5d1c66d7b36c1e2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Huixuan Wu\, Max Planck Institute for Dynamics and Self-Org
 anization\, Göttingen\, Germany\nBio: Dr. Huixuan Wu studied at Johns Hop
 kins University\, Baltimore\, USA\, from 2005 to 2011. He received his PhD
  from the Mechanical Engineering Department for his experimental studies o
 f the complex vortical flow in the rotor tip region of a turbomachinery. S
 ince November 2011\, he has been a postdoctoral fellow at Max Planck Insti
 tute for Dynamics and Self-Organization\, Göttingen\, Germany. He receive
 d an Alexander von Humboldt Scholarship in February 2013. His current proj
 ect is simultaneous measurements of velocity and vorticity in complex flow
 s. Dr. Wu is also interested in particle dynamics\, thermodynamics\, heat 
 transfer\, and applied optics.\nAbstract : Particle-based flow diagnostic 
 technologies are essential in obtaining quantitative measurements of three
 -dimensional flow fields\, which provide insights into many complex flow p
 roblems. As an example\, I will present our particle image velocimetry (PI
 V) study of the rotor tip flow in a turbomachine. Turbomachinery tip flow 
 is tightly linked to efficiency loss\, structure vibration\, and even fail
 ure of the machine\, but this flow is notoriously complex because it is in
 herently a multi-scale problem with moving boundaries. In our experiments\
 , we obtained the fully resolved tip flow fields\, which clarified the dyn
 amics of the tip leakage\, the interactions among flow structures\, and th
 e production of turbulence. These results also shed light on the mechanism
  of stall inception. Besides applications of PIV\, I will introduce an inn
 ovative experimental technique: Direct Vorticity Probing\, which measures 
 vorticity by detecting the spin of micro-sized\, mirror-encapsulated parti
 cles. The high spatial resolution of this approach makes it superb in vort
 icity measurement compared to conventional indirect methods. I will also d
 iscuss the potential applications of this innovative technology in turboma
 chinery flows\, as well as in other vortical flows.
LOCATION:ME B1 10 http://plan.epfl.ch/?room=MEB110
STATUS:CONFIRMED
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