Accession Number : ADA004803

Title :   Reynolds Number Effects on the Boattail Characteristics of a Simulated Nacelle at a Mach Numer of 0.8.

Descriptive Note : Final rept. 1 Dec 73-8 Aug 74,


Personal Author(s) : Dansby,Ted

Report Date : OCT 1974

Pagination or Media Count : 78

Abstract : The effect of Reynolds number on the boattail drag of three simulated afterbody configurations is presented for zero angle of attack for a Mach number of 0.8. The boattail pressure drag for one of the configurations is shown to first decrease, then significantly increase, as the Reynolds number increases. The behavior is explained by the regular variation of pressures in regions of the boattail. The mechanism governing this behavior is discussed and is partially predicted from state-of-the-art theoretical techniques. The influence of model installations and test techniques is shown to have a marked effect on the level of the drag.

Descriptors :   *Nacelles, *Afterbodies, *Aerodynamic characteristics, Drag, Reynolds number, Subsonic characteristics, Wind tunnel models

Subject Categories : Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE