WIND TUNNEL DATA
AIAA CFD High Lift Prediction Workshop
Wind tunnel data (from the QinetiQ Five-Meter Pressurized Low-Speed Wind Tunnel in Farnborough, UK)
are provided here (all for the nominal 40/37 configuration):
- Forces and Moments: Exp_Forces_Moments.tar.gz
- The wind tunnel polar data was obtained using a pitch-pause approach, increasing AoA from one angle to the
next with rotation speed of roughly 0.2 deg/sec. When pausing at each AoA, a human-in-the-loop waited for
the tunnel to attain the correct Q and Mach number and for the balance to stabilize. Then, the data
were taken and averaged over a 5 second window. On average, this whole period was roughly 30 seconds
for each AoA (move, stabilize, acquire).
- To correct the wind tunnel data to free-air conditions, the QinetiQ tunnel used "Ashill's Wall Pressure
Method" for flow angularity.
- Hysteresis was not explored/documented in the QinetiQ test.
- Surface Mini-Tuft Photos: Mini_Tuft.tar.gz
- Surface Oil Flow Photos: Oil_Flow.tar.gz
- Surface Pressures:
- Floor Rake Data:
- R266RakeData_v2.xlsx <- new as of 03/17/2021
- ΔCpt = (Pt,probe - Pt,ref) / Qref provided as a function of height in the QinetiQ tunnel
- Height given both in mm (for actual tunnel) and in inches (for "scaled up" version of tunnel that is
10x the actual size)
- BL Rake is on the floor of the tunnel upstream of the model; see details on
Geometry Files page
Note: there is no information on the particular camera positions used for taking the various oil flow and mini-tuft photos.
Please check periodically for updates, and/or get on the email distribution list by request to
to be notified directly of any updates/changes.
Note 1: related AIAA papers on the HLPW-4 CRM-HL testing and configuration are: AIAA-2020-2770 and AIAA-2020-2771 (also
mentioned on the Geometries page).
Note 2: the same wind tunnel test article, with slightly different configuration settings, was tested earlier in
the NASA Langley 14x22 wind tunnel (which also involved separate flow control investigations).
This 14x22 test was at a lower Reynolds number (3.27 x 106 per mean
aerodynamic chord) than the QinetiQ case being used for HLPW4 (5.49 x 106).
Because the reference case in the 14x22 test involved a different REMAC and
slightly different configuration settings, it is not
appropriate to make direct comparisons to the 14x22 data using the current HLPW-4 provided geometry.
Nevertheless, participants may be interested to see documentation of the earlier wind tunnel results:
AIAA-2019-3723, AIAA-2019-3727, AIAA-2020-0786.
Return to: High Lift Prediction Workshop Home Page
Recent Significant Site Updates
04/01/2021 - Added information regarding how the tunnel polar was attained
03/17/2021 - Replaced R266RakeData.xlsx with R266RakeData_v2.xlsx, and provided formula
03/04/2021 - Added some related AIAA paper references
02/12/2021 - Floor rake data posted
01/13/2021 - Model surface pressures posted
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Last Updated: 04/08/2021