THE MODIFIED TRIPLES ALGORITHM FOR FLUSH AIR DATA SENSING SYSTEM APPLIED TO THE VEHICLE WITH BLUNT FORE-BODIES¹⁾

In view of the restrictive requirement of the pressure port configuration for the flush air data sensing (FADS) system based on the classical triple algorithm, a modified triple algorithm is developed and verified. Firstly, the classical triple algorithm and the modified triple algorithm are described. Secondly, the feasibility of the FADS system based on the modified triple algorithm including the pressure port configuration and the solving accuracy is evaluated. Finally, the advantages and the disadvantages of these two different methods are compared. The following results are obtained: (1)The solving accuracy becomes much less sensitive to the pressure port configuration for the FADS system based on the modified classical triple algorithm than that based on the classical triple algorithm. Therefore, much more pressure configurations can be used to predict the flight parameters and the restrictive requirement of the pressure port configuration is not necessary. (2)The solving accuracy differences between these two different methods is small, and the pressure port configuration still need to be verified.