The
primary test facility in the FPCL is a low turbulence intensity (<
0.1%), quiet, open-return wind tunnel that was designed and constructed
by Prof. Lueptow and his students at Northwestern University in Evanston, IL. The
tunnel, which was moved to MSU in the spring of 1999, has a test section
that is approximately 14" by 14" in cross section by 10
ft long and can operate at speeds up to 40 ft/s. A second flow facility
is currently under construction. The facility is also an open-return
wind tunnel that has a 2' x 2' 6 ft.-long test-section. Flow through
the facility is driven by an adjustable-pitch axial fan drive in a
suction mode. Another flow facility that is also currently under construction
is a tabletop unsteady Couette flow facility for static and dynamic
calibration of wall shear sensors up to a frequency of approximately
3 kHz.
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Data acquisition in the lab is accomplished using either a general-purpose
12-bit 16-channel 200 kHz data acquisition board from National Instruments
or a specialized 12-bit two-channel 50 MHz digitizer with 1 MByte
on-board RAM from Gage. Both boards are controlled using LabView
from National Instruments. Another 4-channel simultaneous sampling
board is also available. A total of six PC systems are used for
data acquisition and post processing.
Instrumentation
in the laboratory include:
1.
Four TSI hot-wire channels.
2. Three pressure transducers
for use in static pressure measurements.
3.
48-port ScaniValve pressure scanner.
4.
Smoke-wire visualization system with fiberoptic stroboscope
illumination system.
5.
Two CCD cameras and a conventional camera.
6.
Two ¼" Larson Davis microphone system with hand held
calibrator.
7.
Actively controlled Melles Griot floating optical table and conventional optical
breadboard.
8. A full Doppler system and
associated optical accessories.
9.
Equipment for driving audio and piezo-electric elements.
10.
Function generators, oscilloscopes, digital multimeters, etc.
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Figure
1 shows an oblique view of the test section of the 14" by 14" wind tunnel. A test model is mounted inside the test section |
Finally, a hot-wire fabrication station is also available for construction
and repair of hot wires. Additionally, an electronics workbench, components
and tools are available for constructing general purpose electronic
circuits for signal conditioning, synchronization, etc.
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