PIV Instrumentation for Large-Scale Water Tunnel Testing
Abstract
Particle-imaging velocimetry (PIV) is a standard tool for nonintrusive planar velocity measurements within laboratory-scale flow fields. However, some unique implementation challenges are presented by PIV measurements in the world's largest water tunnel, the US Navy's Large Cavitation Channel (LCC). The LCC holds more than 5,000 cubic meters of water so seeding the entire water mass is impractical. Moreover, in-water optical path lengths are considerably longer than in smaller facilities so seed-induced reduction in water clarity must be avoided. This presentation covers the design an implementation of a PIV system for the LCC. The newly developed system includes a special seed injection system placed upstream of the flow straightner, two ND-YAG lasers (800 mJ per pulse at 532 nm), and two 1K by 1K cross-correlating digital cameras. Current empty-test-section PIV and hot-film-probe measurements for flow speeds between 1 to 18 m/s will be shown. On-going and future high-Reynolds number measurements using this PIV system will be described. [Sponsored by the Office of Naval Research, Code 333.]
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2000
- Bibcode:
- 2000APS..DFD.MG006B