Computer Assisted Velocity and Turbulence Measurements in a Plane Free Jet at High Subsonic Velocities.
Abstract
Methods and results of an experimental study of turbulence parameters for a plane free jet at high subsonic velocities, using hot wire anemometer signals outputing directly to an on-line computer controlled data acquisition system are reported. The apparatus studied had a nozzle exit, 1 x 10 cm, designed for two-dimensional flow. Two measurement planes at 25 and 50 jet widths downstream were chosen to provide measurements to compare with existing data for the facility. Nozzle velocities of M=0.4 and M=0.6 were chosen for the same reason. The techniques for employing hot-wire anemometry coupled with computer controlled data acquisition are described. A comparison of data obtained with the computer is made to data previously obtained by more traditional methods. A comparison of linearized and non-linearized anemometer output is made. A new calibration technique, also utilizing the data acquisition system to greatly decrease the sensor calibration time, was also developed. The turbulence parameters compared are mean velocity, turbulence intensities, micro-scale, and integral scale of turbulence. The computer determined parameters compared favorably in all cases with the already available data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA111169
Entities
People
- Michael J. Kirchner
Organizations
- Air Force Institute of Technology