NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 01.04-1456

PROJECT TITLE : Seven-Sensor Probes for Dusty and/or Compressible Flows

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

Five-hole or seven-hole probes are impact probes which have been employed in the past to measure flow velocity and direction in aerodynamic applications. These probes are inexpensive, reliable, easy to use and return three components of the velocity as well as static and dynamic pressure. A variety of tip shapes has been employed, like conical or spherical but so far, no serious effort has been made to carry out a comprehensive comparison of their performance. Moreover, very little is known about the Reynolds-number and Mach-number effects on the calibration of these probes. Some modifications of the design are also needed, namely incorporating temperature sensors at the tip to allow simultaneous temperature measurements and also mounting miniature pressure transducers at the tip to increase the frequency response. An artificial neural network developed with NASA LaRC support will be modified and a subsonic/supersonic continuous flow tunnel will be equipped with calibration hardware to extend the calibration range to high Reynolds numbers and Mach numbers.
POTENTIAL COMMERCIAL APPLICATIONS
Aeroprobe Corporation manufactures a variety of probe sizes and configurations and markets such multi-hole probes as well as the peripherals necessary for stand-alone systems. The peripherals include, but are not limited to, traversing scales, automatic calibration units, data acquisition boards and software. Such systems have been employed in wind tunnel testing, mostly related to problems in aeronautics. The proposed work will document carefully the performance of different designs. It will also help in the design and calibration of probes that could be used in a variety of applications, thus expanding the markets of the company.
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Matthew D. Zeiger,
Aeroprobe Corp.,
3138 Indian Meadow Dr.,
Blacksburg, VA 24060
NAME AND ADDRESS OF OFFEROR