Demonstration of a Technique for the Measurement of Surface Pressures on Spinning Wind Tunnel Models via Telemetry.
Abstract
The measurement of surface pressures on rotating bodies such as wind tunnel models or spin-stabilized projectiles is possible through the use of a telemetry link. Via telemetry, the rotating and/or translating frame can be coupled to the laboratory or stationary frame, but great care must be exercised to properly account for differences in phase within the various data channels. A novel and unique pressure measurement was accomplished by Mark for a spinning wind tunnel model, but the circumferential pressure distributions contained an anomalous phase error. This error has been identified and corrected. A phase delay was produced by a low pass filter used in the discrimination of the output of the telemetry receiver. Since the receiver output had been recorded in an analog form, some of the original data were re-reduced with corrections for a constant phase delay. With the phase anomaly explained, the original technique of Mark presents a very attractive scheme for the acquisition of surface pressure data from spinning models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1980
- Accession Number
- ADA086119
Entities
People
- William P. D'amico Jr.
Organizations
- Ballistic Research Laboratory