A High Sensitivity, Large Bandwidth Constant Voltage Anemometer for Speed Transition
A High Sensitivity, Large Bandwidth Constant
Voltage Anemometer for Speed Transition
Analytical Services & Materials, Inc.
107 Research Drive
Hampton, VA 23666
Siva M. Mangalam (804-865-7093)
A new approach will be developed to measure low-amplitude,
high-frequency flow fluctuations which lead to high-speed
boundary-layer transition in low-disturbance (quiet) wind tunnels.
The constant voltage anemometer (CVA) concept provides large
bandwidths with high sensitivity. Preliminary studies at low
speeds have shown that the CVA holds significant promise for high-
speed applications. During Phase I, a prototype device will be
built and tested in high-speed wind tunnels, and the results will
be compared with data obtained under identical test conditions
using conventional instrumentation. Because conventional anemome-
ters have limited bandwidth and low signal-to-noise ratio at high
frequencies, independent tests will be conducted to establish the
bandwidth of the CVA. Concurrently, theoretical analysis will be
carried out to establish the relationship between the output
signals of the CVA and the physical flow parameters. During Phase
II, the CVA will be used to study attachment-line instability and
transition on a swept-wing model. These studies will be used to
establish the design parameters and operational characteristics of
the CVA for research and commercial applications.
Potential Commercial Application:
Potential Commercial Applications: The development of this device
will meet the demand for high-sensitivity, large-bandwidth thermal
anemometers needed for high-speed dynamic flow measurements. The
CVA will find commercial applications in all national and
international organizations involved in flow measurements.