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NREL's S831 Airfoil (s831-nr)

NREL's S831 Airfoil - NREL HAWT airfoil S831 tip 18.0% Dia=40 to 50 m Re=3.5E+6 Clmax(S)=1.50 Clmax(R)=1.48 High max lift coef


Airfoil s831-nr
Details Dat file Parser  
(s831-nr) NREL's S831 Airfoil
NREL HAWT airfoil S831 tip 18.0% Dia=40 to 50 m Re=3.5E+6 Clmax(S)=1.50 Clmax(R)=1.48 High max lift coef
Max thickness 18% at 44.2% chord.
Max camber 5% at 53.1% chord
Source NWTC National WInd Technology Center
Source dat file
The dat file is in Selig format
NREL's S831 Airfoil
   x/c        y/c
1.000000   0.000000
0.996135   0.001055
0.985140   0.004813
0.968342   0.011573
0.946987   0.020825
0.921802   0.031665
0.892944   0.043266
0.860354   0.055441
0.824598   0.068183
0.786318   0.081159
0.746095   0.093944
0.704447   0.106077
0.661848   0.117074
0.618711   0.126403
0.575223   0.133491
0.531374   0.137989
0.487067   0.139780
0.442228   0.139168
0.397275   0.136586
0.352693   0.132262
0.308992   0.126384
0.266627   0.119119
0.226079   0.110644
0.187765   0.101132
0.152120   0.090773
0.119511   0.079753
0.090311   0.068282
0.064830   0.056552
0.043333   0.044786
0.026064   0.033188
0.013075   0.022006
0.004490   0.011683
0.000358   0.002767
0.000044   0.000883
0.000042  -0.000801
0.000170  -0.001549
0.000408  -0.002208
0.000798  -0.002808
0.001343  -0.003400
0.002797  -0.004575
0.009658  -0.007951
0.024215  -0.011696
0.045249  -0.014798
0.072290  -0.017961
0.104406  -0.021314
0.141046  -0.024794
0.181460  -0.028309
0.225087  -0.031714
0.271224  -0.034849
0.319288  -0.037521
0.368594  -0.039511
0.418547  -0.040536
0.468500  -0.040128
0.518467  -0.037670
0.568613  -0.033262
0.618885  -0.027181
0.669241  -0.019934
0.719339  -0.012257
0.768650  -0.004920
0.816389   0.001180
0.861302   0.005304
0.901930   0.007074
0.936659   0.006680
0.964289   0.004890
0.984164   0.002634
0.996059   0.000768
1.000000   0.000000
Dat file parser warnings
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Polars for NREL's S831 Airfoil (s831-nr)

PlotAirfoilReynolds #NcritMax Cl/CdDescriptionSource 
   s831-nr50,000917.2 at α=13.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s831-nr50,000514.2 at α=13.75°Mach=0 Ncrit=5Xfoil predictionDetails
   s831-nr100,000921.8 at α=13°Mach=0 Ncrit=9Xfoil predictionDetails
   s831-nr100,000521.2 at α=12.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s831-nr200,000936.7 at α=11.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s831-nr200,000547 at α=3.5°Mach=0 Ncrit=5Xfoil predictionDetails
   s831-nr500,0009113.9 at α=7.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s831-nr500,0005112.6 at α=6.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s831-nr1,000,0009152.7 at α=6.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s831-nr1,000,0005147.5 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
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