Unsteady Low-Speed Windtunnel Test of a Straked Delta Wing, Oscillating in Pitch. Part 1. General Description and Discussion of Results

Abstract : Results of a wind tunnel test of an oscillating straked wing indicate unsteady airloads and pressure distributions for a range of incidences (-8 to 50 deg.) and amplitudes (1 to 16 deg.). The wind speed was 80 meters/second, which provided reduced frequencies up to 0.50 based on root chord. The zeroth and first harmonic as well as the continuous time history of the pressure and overall loads were measured. Flow visualization was performed for flow of 30 meters/second using a pulsating laser light sheet. This part presents the description of this wind tunnel test and preliminary discussions of results obtained from the test. Details are provided on the model, instrumentation and support system as well as test program condition/run member cross-reference tables for use with the data base presented in parts II through VI of this report. Model geometry and force data processing procedures are presented in the appendices. Also presented in the appendices are updated values of force data obtained from the steady tests of the model suspended by a wire balance.