Particle image velocimetry (PIV) was performed utilizing clean seed
particles generated by injecting liquid carbon dioxide (CO2)
directly into an open-circuit blowdown Mach 2.9 supersonic wind
tunnel. Rapid atomization and cooling of the liquid CO2 created a
preponderance of nearly uniform and well dispersed microscopic dry
ice particles which were illuminated using a frequency double Nd:
YAG laser. Ample light was scattered from the flow tracers, which
provided a strong signal to noise ratio. The particles completely
sublimed into an innocuous gas downstream of the test section
causing no side effects or problems with wind tunnel operation. A
variety of geometries were inspected using PIV. In addition to
empty test section characterization, flow aft of a cone and
transverse injection through a long shallow cavity was visualized
and adaptive cross-correlation vector maps were computed. These
vector maps revealed many relevant flow structures pertinent to
each test setup. Measured velocities followed the trends expected
for each test setup but the vector magnitudes were shifted 3-9%
below those predicted by theory. Procedures and information
pertinent to liquid CO2 injection are provided to help researchers
implement this process in similarly scaled supersonic wind tunnels.
General
Imprint: |
Biblioscholar
|
Country of origin: |
United States |
Release date: |
October 2012 |
First published: |
October 2012 |
Authors: |
Donald Wallace Peltier
|
Dimensions: |
246 x 189 x 12mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
234 |
ISBN-13: |
978-1-249-59587-8 |
Categories: |
Books >
Social sciences >
Education >
General
|
LSN: |
1-249-59587-8 |
Barcode: |
9781249595878 |
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