Abstract
In this paper the computed error in pressure and local flow orientation at installed air data sensors of a modern fighter aircraft during aerial refueling is presented. The source of this error is the close proximity of the trajectory of the aerial refueling basket. This close proximity of the aerial refueling basket disturbs the local flow field and therefore causes errors in addition to those normally present (and catered for in system design) due to variation of flow conditions such as angle-of-attack (AOA) and sideslip angle (). These errors adversely affect critical aircraft systems like the fly-by-wire flight control system. It is, therefore, necessary to quantify these additional errors for subsequent correction. In the present study the errors are computationally evaluated near M=0.6 at AOA = 06 Deg, which is the aerial refueling flight condition of the under study aircraft. The results of this study indicate significant induced errors in terms of variation in static pressure and flow orientation at the location of the air data probes. This error reduces for the air data probe located farthest from the proposed aerial refueling basket trajectory. In this study the computed induced error has been characterized as function of location of basket relative to Air Data Sensors.
Published Version
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