국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	QUALITATIVE EVALUATION OF A FLUSH AIR DATA SYSTEM AT TRANSONIC SPEEDS AND HIGH ANGLES OF ATTACK
저자	Terry J.Larson, Stephen A. Whitmore, L. J.Ehernberger, J. Blair Johnson and Paul M. Siemers, III
Keyword	Air data systems; Angle of attack; Flow distribution; Orifice flow; Pitot tubes; Stagnation pressure; Transonic speed
URL	http://www.dfrc.nasa.gov/DTRS/1987/PDF/H-1277.pdf
보고서번호	NASA-TP-2716
발행년도	1987
출처	NASA Dryden Flight Research Center
ABSTRACT	Flight tests were performed on an F-14 aircraft to evaluate the use of flush pressure orifices on the nose section for obtaining air data at transonic speeds over a large range of flow angles. This program was part of a flight test and wind tunnel program to assess the accuracies of such systems for general use on aircraft. It also provided data to validate algorithms developed for the shuttle entry air data system designed at NASA Langley. Data were obtained for Mach numbers between 0.60 and 1.60, for angles of attack up to 26.0 deg, and for sideslip angles up to 11.0 deg. With careful calibration, a flush air data system with all flush orifices can provide accurate air data information over a large range of flow angles. Several orificies on the nose cap were found to be suitable for determination of stagnation pressure. Other orifices on the nose section aft of the nose cap were shown to be suitable for determination of static pressure. Pairs of orifices on the nose cap provided the most sensitive measurements for determining angles of attack and sideslip, although orifices located farther aft on the nose section could also be used.