Accession Number:

ADA252878

Title:

Static and Dynamic Flow Visualization Studies of Two Double-Delta Wing Models at High Angles of Attack

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-03-01

Pagination or Media Count:

107.0

Abstract:

A water tunnel flow visualization was performed to study the vortex development and bursting phenomena on a baseline double delta wing model and a modified double delta wing model. The primary focus of this study was two-fold First, to study the static and dynamic effects or pitch and pitch rate on the vortical flowfield of the individual models. Second, to compare the vortex breakdown characteristics of these two models under static and dynamic conditions. Results indicate that the vortex burst location moves forward with increasing AOA for both the models relative to the static case, the bursting is delayed during pitch-up motion with the vortex burst lag increasing with the pitch rate. Compared with the baseline model, the small geometry modification at the strakewing junction of the modified model changes the local flowfield by developing the wing vortex earlier and promoting earlier coiling-up of strake and wing vortices.

Subject Categories:

  • Aircraft
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE