고도 변화에 따른 5공 프로브 보정오차의 특성에 관한 전산해석

Abstract

In this study, calibration error characteristics of a five-hole probe according to altitude change were analyzed by computational analysis. Since the information on atmospheric and flight conditions is critical in the safe operation of an aircraft, accurate measurement through the air data system remains an important technological issue. To fully utilize the values from the five-hole multi-function probe, a calibration technique is needed to establish the relationship between the measured pressure value difference and the flow condition. Using a CFD code, computational calculations were performed at sea-level, 6km, and 12km altitude for various angles of attack and sideslip. The pressure coefficient was then calculated from the computed results, and a calibration method was applied. The results showed that the calibration error increases with increasing altitude, which is related directly to the change in the Reynolds number.