Experimental data
The data shown in this page are measured on the 2.16% NASA-CRM model using JAXA wind tunnel test.
Reference Area, S = 0.179014 m2
Reference Chord, c = 0.15131 m( = MAC)
Reference Span, b = 1.26927 m( = span)
Moment Reference (X,Y,Z) = (0.72741, 0.0, 0.097627) m
For more details on the data, see the following reference (available from the NASA Common Research Model website here):
Shunsuke Koike, Makoto Ueno, Kazuyuki Nakakita and Atsushi Hashimoto, "Unsteady Pressure Measurement of Transonic Buffet on NASA Common Research Model", AIAA 2016-4044, June 2016.
Information on trip dots
Trip | Aeronautical trip dot (CAD Cut) |
Diameter [mm] | 1.27 |
Distance (between dot centers) [mm] | 2.54 |
Height (main wing) [mm] | 0.11430 (inner-wing) 0.09906 (mid-wing) 0.08890 (outer-wing) |
Location (main wing) | 10% chord (upper and lower sides) |
Height (horizontal stabilizers) [mm] | 0.09906 |
Location (horizontal stabilizers) | 10% chord (upper and lower sides) |
Height (body) [mm] | 0.08890 |
Location (body) | 1.5% body length (azimuthally around the nose) |
RunNo. | CaseNo. | Re | P0 | T0 | M | α | CD | CL | CmS | CSV file |
4912 | 20 | 1.52 | 80.0 | 323 | 0.849 | 1.22 | 0.0209 | 0.2718 | 6.503e-2 |
buffet_cdclcm_dpw8.csv
(Data from CaseNo.16 to 45) |
4912 | 21 | 1.52 | 80.0 | 323 | 0.849 | 2.29 | 0.0249 | 0.4237 | 2.508e-2 | |
4912 | 31 | 1.52 | 80.0 | 323 | 0.849 | 4.84 | 0.0588 | 0.6872 | -0.193e-2 | |
4912 | 41 | 1.52 | 80.0 | 323 | 0.848 | 5.89 | 0.0780 | 0.7598 | 0.984e-2 |
Re | : Reynolds number [million] based on MAC |
P0 | : Total pressure [kPa] |
T0 | : Total temperature [K] |
M | : Corrected Mach number [-] |
α | : Corrected angle of attack [deg] |
CD | : Corrected drag coefficient [-] |
CL | : Corrected lift coefficient [-] |
CmS | : Corrected pitching moment coefficient [-] |
Cp distributions (Average,RMS)
Cp data was measured by:
- Cp by steady pressure sensor (ESP)
- Cp of average and RMS by unsteady pressure sensor (Kulite)
NOTE: The full-span model has a right "steady" wing and a left "unsteady" wing. Due to different equipment, right and left wings are structurally different, and therefore do not deform in the same way. Deformation measurements and CAD refer to the left "unsteady" wing, for which Kulite data are provided. Steady pressure sensor measurements from the right "steady" wing are also provided for reference. Differences in deformations result in slight differences between the steady (ESP) and time-averaged unsteady (Kulite) pressure measurements.
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Span location | y[mm] | η | Cp data (CSV format) |
Section E | 317.318 | 0.500 | buffet_wingcp_dpw8.csv |
Section F | 380.781 | 0.600 |
Unsteady pressure data (Time history,PSD)
Cp data by unsteady pressure sensor (Kulite)
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Port No. |
x/c (Upper surface) |
Span location | Cp data (CSV format) |
CH1 | 0.2819 | Section E η = 0.500 |
Time history(α=1.22deg): Time history(α=2.29deg): Time history(α=4.84deg): Time history(α=5.89deg): PSD [1/Hz](α=1.22deg): PSD [1/Hz](α=2.29deg): PSD [1/Hz](α=4.84deg): PSD [1/Hz](α=5.89deg): |
CH2 | 0.3040 | ||
CH3 | 0.3260 | ||
CH4 | 0.3480 | ||
CH5 | 0.3700 | ||
CH6 | 0.3920 | ||
CH7 | 0.4140 | ||
CH8 | 0.4360 | ||
CH9 | 0.4581 | ||
CH10 | 0.5700 | ||
CH11 | 0.6800 | ||
CH12 | 0.7903 | ||
CH13 | 0.1605 | Section F η = 0.600 |
|
CH14 | 0.1854 | ||
CH15 | 0.2102 | ||
CH16 | 0.2351 | ||
CH17 | 0.2600 | ||
CH18 | 0.2848 | ||
CH19 | 0.3097 | ||
CH20 | 0.3346 | ||
CH21 | 0.3595 | ||
CH22 | 0.4950 | ||
CH23 | 0.6310 | ||
CH24 | 0.7677 |
*PSD of Cp are calculated from time history data under the following conditions
Δt [s] | : 0.00002 |
Number of samples | : 499,712 |
Number of samples per block | : 8,192 |
Number of averages | : 121 |
Overlap | : 0.5 (50%) |
Window function | : Not used |
Output values | : One-sided power spectral density |
Unit | : 1/Hz | Normalization | : The integral value of PSD corresponds to the RMS in the time direction. |
Deformation informations
Position before deformation | AoA = 1.22deg | AoA = 2.29deg | AoA = 4.84deg | AoA = 5.89deg | |||||||
Marker ID | x[mm] | y[mm] | z[mm] | Δz[mm] | Δα[deg] | Δz[mm] | Δα[deg] | Δz[mm] | Δα[deg] | Δz[mm] | Δα[deg] |
201 | 558.610 | 105.191 | -15.721 | 0.357 | 0.389 | 0.295 | 0.287 | ||||
202 | 651.608 | 105.191 | -22.207 | 0.439 | -0.023 | 0.463 | -0.022 | 0.382 | -0.021 | 0.393 | -0.028 |
203 | 744.183 | 105.191 | -35.747 | 0.425 | 0.457 | 0.360 | 0.374 | ||||
204 | 632.574 | 215.746 | -16.204 | 0.525 | 0.594 | 0.447 | 0.450 | ||||
205 | 699.777 | 215.746 | -16.136 | 0.635 | -0.097 | 0.746 | -0.123 | 0.600 | -0.127 | 0.600 | -0.132 |
206 | 766.844 | 215.746 | -23.570 | 0.754 | 0.882 | 0.746 | 0.759 | ||||
207 | 729.204 | 350.702 | -9.925 | 1.071 | 1.414 | 1.373 | 1.414 | ||||
208 | 780.545 | 350.702 | -7.286 | 1.302 | -0.263 | 1.707 | -0.333 | 1.718 | -0.418 | 1.779 | -0.423 |
209 | 832.002 | 350.702 | -11.605 | 1.543 | 2.011 | 2.122 | 2.173 | ||||
210 | 836.606 | 498.954 | 5.173 | 2.612 | 3.662 | 4.345 | 4.438 | ||||
211 | 873.418 | 498.954 | 7.676 | 2.907 | -0.456 | 4.020 | -0.560 | 4.819 | -0.722 | 4.913 | -0.721 |
212 | 910.394 | 498.954 | 5.397 | 3.199 | 4.381 | 5.273 | 5.365 | ||||
213 | 880.023 | 558.864 | 13.814 | 3.440 | 4.853 | 5.977 | 6.094 | ||||
214 | 910.963 | 558.864 | 16.284 | 3.678 | -0.507 | 5.182 | -0.627 | 6.364 | -0.773 | 6.456 | -0.784 |
215 | 942.081 | 558.864 | 14.538 | 3.987 | 5.530 | 6.812 | 6.940 | ||||
216 | 923.446 | 618.774 | 23.298 | 4.336 | 6.146 | 7.689 | 7.799 | ||||
217 | 948.521 | 618.774 | 25.615 | 4.487 | -0.447 | 6.356 | -0.573 | 7.984 | -0.774 | 8.111 | -0.769 |
218 | 973.781 | 618.774 | 24.835 | 4.725 | 6.646 | 8.364 | 8.470 |
Δz | : Amount of deflection |
Δα | : Amount of torsion |