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The Influence of Geometry Parameters Upon Lag Error in Airborne Pressure Measuring Systems
WRIGHT AIR DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
The general nature of the lag problem in airborne pressure measuring systems is discussed. It is concluded that variations in system geometry offer the most promise in improving response. The remainder of the report is given to a theoretical examination of various geometry parameters and to an evaluation utilizing both theoretical and experimental methods of their effect upon lag error. Techniques for computing lag error in any system are presented. Theory and experiment are shown to be in agreement for the case of laminar flow. Evidence of transitional flow is also presented. Based upon the results of the study, specific dimensions for tubing lines and pitot-static tube chambers are recommended for use in the static pressure systems of high performance aircraft.
APPROVED FOR PUBLIC RELEASE