Transonic Pressure, Force, and Flow-Visualization Measurements on a Pitching Straked Delta Wing at High Alpha

摘要

A force and pressure test was conducted in May 1992 (at the National Aerospace Laboratory NLR, The Netherlands) on a simple straked wing with the objective to extend the understanding of flow fields at low speed and high incidence obtained in earlier tests, up to transonic speeds also at high incidences. A flow visualization test was then conducted with the same simple straked wing modes in August 1996 for the purpose of obtaining flow- visualization data to complement the pressure and force database generated in the earlier tests. These tests were conducted in order to examine the flow-field characteristics at high-alpha conditions that involve vortices, shocks, and separated flows. Laser light sheet/water vapor techniques were used to illuminate the flows, and video recording was used to obtain the data. Both low- and high-speed video cameras were used to examine spanwise and streamwise laser sheet positions. In addition, under NLR funding, some preliminary particle image velocimetry (PIV) data were obtained at M - 0.225 and 0.6, as well as some pulsed laser-flow visualization (9 nano-sec pulse) at M - 0.9. Correlation was performed between the flow visualization data from this test and the pressure/ force data obtained in 1992 on the same configuration. The database described in this paper has been included in the RTO database for verification and validation data for computational unsteady aerodynamics.