001/* 002* NACA66Series -- An arbitrary NACA 66 series airfoil. 003* 004* Copyright (C) 2010-2012 by Joseph A. Huwaldt 005* All rights reserved. 006* 007* This library is free software; you can redistribute it and/or 008* modify it under the terms of the GNU Lesser General Public 009* License as published by the Free Software Foundation; either 010* version 2.1 of the License, or (at your option) any later version. 011* 012* This library is distributed in the hope that it will be useful, 013* but WITHOUT ANY WARRANTY; without even the implied warranty of 014* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015* Lesser General Public License for more details. 016* 017* You should have received a copy of the GNU Lesser General Public License 018* along with this program; if not, write to the Free Software 019* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 020* Or visit: http://www.gnu.org/licenses/lgpl.html 021**/ 022package jahuwaldt.aero.airfoils; 023 024import java.util.List; 025import java.awt.geom.Point2D; 026import java.text.DecimalFormat; 027import java.text.NumberFormat; 028 029 030/** 031* <p> This class represents an arbitrary NACA 66 series 032* airfoil section such as a NACA 66-020 airfoil. 033* </p> 034* 035* <p> Ported from FORTRAN "NACA6.FOR" to Java by: 036* Joseph A. Huwaldt, June 4, 2010 </p> 037* 038* <p> Original FORTRAN "NACA4" code had the following note: </p> 039* 040* <pre> 041* AUTHORS - Charles L.Ladson and Cuyler W. Brooks, NASA Langley 042* Liam Hardy, NASA Ames 043* Ralph Carmichael, Public Domain Aeronautical Software 044* Last FORTRAN version: 23Nov96 2.0 RLC 045* 046* NOTES - This program has also been known as LADSON and SIXSERIES and 047* as SIXSERIE on systems with a 8-letter name limit. 048* REFERENCES- NASA Technical Memorandum TM X-3069 (September, 1974), 049* by Charles L. Ladson and Cuyler W. Brooks, Jr., NASA Langley Research Center. 050* 051* "Theory of Wing Sections", by Ira Abbott and Albert Von Doenhoff. 052* </pre> 053* 054* <p> Modified by: Joseph A. Huwaldt </p> 055* 056* @author Joseph A. Huwaldt Date: June 5, 2010 057* @version September 15, 2012 058**/ 059public class NACA66Series extends NACA6Series { 060 061 //----------------------------------------------------------------------------------- 062 063 /** 064 * Create a NACA 66 series airfoil with the specified parameters. 065 * 066 * @param CLi Design lift coefficient (e.g.: 66-206 has CLi = 0.2). 067 * @param thickness The thickness to chord ratio (e.g.: 0.20 ==> 20% t/c). 068 * @param length The chord length. 069 **/ 070 public NACA66Series(double CLi, double thickness, double length) { 071 super(CLi, thickness, length); 072 } 073 074 /** 075 * Returns a String that represents the profile type of this airfoil. 076 **/ 077 @Override 078 public String getProfile() { 079 return "66"; 080 } 081 082 // Phi & eps vectors for 66 series airfoil. 083 private static final double[] philde = { 084 0.,.0157,.03139, 085 .04709,.06279,.07849,.0942,.10991, 086 .12563,.14135,.15708,.17277, 087 .18847,.20417,.21987,.23559,.2513, 088 .26701,.28273,.29844,.31416, 089 .32987,.34558,.36129,.37699,.3927, 090 .40841,.42411,.43982,.45553, 091 .47124,.48694,.50265,.51836,.53406, 092 .54977,.56548,.58119,.5969, 093 .61261,.62832,.64403,.65974,.67545, 094 .69116,.70686,.72257,.73828, 095 .75399,.76969,.7854,.80111,.81682, 096 .83253,.84824,.86394,.87965, 097 .89536,.91107,.92677,.94248,.95819, 098 .9739,.98961,1.00532,1.02103, 099 1.03673,1.05244,1.06815,1.08385, 100 1.09956,1.11527,1.13098,1.14669, 101 1.1624,1.17811,1.19381,1.20952, 102 1.22523,1.24093,1.25664,1.27235, 103 1.28806,1.30377,1.31948,1.33519, 104 1.3509,1.3666,1.38231,1.39802,1.41372, 105 1.42943,1.44514,1.46085,1.47656, 106 1.49227,1.50798,1.52368,1.53939, 107 1.5551,1.5708,1.58651,1.60223,1.61794, 108 1.63365,1.64936,1.66507,1.68077, 109 1.69648,1.71218,1.72788,1.74359, 110 1.75931,1.77501,1.79072,1.80643, 111 1.82214,1.83784,1.85355,1.86925, 112 1.88496,1.90066,1.91636,1.93206, 113 1.94776,1.96347,1.97918,1.99489, 114 2.0106,2.02632,2.04204,2.05773, 115 2.07343,2.08913,2.10484,2.12054, 116 2.13625,2.15196,2.16768,2.18339, 117 2.19911,2.21482,2.23052,2.24623, 118 2.26194,2.27765,2.29336,2.30906, 119 2.32477,2.34048,2.35619,2.37191, 120 2.38762,2.40333,2.41905,2.43476, 121 2.45046,2.46617,2.48187,2.49757, 122 2.51327,2.529,2.54473,2.56045,2.57616, 123 2.59188,2.60758,2.62328,2.63898, 124 2.65467,2.67035,2.68609,2.70183, 125 2.71756,2.73328,2.74899,2.76469, 126 2.78039,2.79608,2.81176,2.82743, 127 2.84317,2.85891,2.87463,2.89035, 128 2.90606,2.92176,2.93746,2.95315, 129 2.96883,2.98451,3.00023,3.01595, 130 3.03167,3.04738,3.06309,3.07879, 131 3.09449,3.11019,3.12589,3.14159 }; 132 133 private static final double[] epslde = { 134 0.,.00145,.0029, 135 .00433,.00574,.00712,.00847,.00978, 136 .01105,.01225,.0134,.01447, 137 .01547,.01638,.01719,.01789,.01847, 138 .01893,.01924,.0194,.0194, 139 .01924,.01893,.0185,.01799,.01741, 140 .01679,.01616,.01556,.01499, 141 .0145,.0141,.01379,.01356,.0134, 142 .01331,.01327,.01328,.01333, 143 .0134,.0135,.01361,.01373,.01387, 144 .01402,.01419,.01438,.01458, 145 .0148,.01504,.0153,.01558,.01588, 146 .0162,.01654,.01689,.01726, 147 .01765,.01805,.01847,.0189,.01934, 148 .0198,.02026,.02074,.02124, 149 .02174,.02226,.02279,.02334,.0239, 150 .02447,.02506,.02566,.02627, 151 .0269,.02754,.02819,.02885,.02952, 152 .0302,.03089,.0316,.03231, 153 .03304,.03378,.03453,.0353,.03608, 154 .03688,.0377,.03853,.03938, 155 .04025,.04113,.04202,.04293,.04386, 156 .04479,.04574,.0467,.04767, 157 .04866,.04966,.05067,.05171,.05277, 158 .05386,.05498,.05612,.0573, 159 .05851,.05976,.06103,.06231,.06362, 160 .06493,.06625,.06758,.06889, 161 .0702,.07149,.07277,.07402,.07524, 162 .07644,.0776,.07872,.07979, 163 .08082,.0818,.08272,.08359,.0844, 164 .08515,.08585,.08649,.08708, 165 .08761,.08808,.0885,.08886,.08916, 166 .08941,.08959,.08972,.08978, 167 .08978,.08972,.08959,.0894,.08914, 168 .08882,.08843,.08797,.08745, 169 .08687,.08622,.08551,.08474,.0839, 170 .083,.08203,.08101,.07991, 171 .07875,.07752,.07622,.07485,.07341, 172 .0719,.07031,.06864,.06691, 173 .0651,.06323,.06129,.05928,.05722, 174 .05509,.0529,.05064,.04833, 175 .04596,.04354,.04108,.03856,.03601, 176 .03341,.03077,.0281,.02539, 177 .02264,.01987,.01707,.01426,.01143, 178 .00858,.00573,.00287,0. }; 179 180 /** 181 * Fill in phi, eps vectors for 66 series airfoil. 182 * 183 * @param phi An existing array with 201 elements to be filled in 184 * by this method. 185 * @param eps An existing array with 201 elements to be filled in 186 * by this method. 187 **/ 188 @Override 189 protected final void phep(double[] phi, double[] eps) { 190 System.arraycopy(philde, 0, phi, 0, 201); 191 System.arraycopy(epslde, 0, eps, 0, 201); 192 } 193 194 195 // Phi & eps vectors for 66 series airfoil. 196 private static final double[] philds = { 197 0.,.01573,.03145, 198 .04718,.0629,.07862,.09433,.11003, 199 .12572,.14141,.15708,.1728, 200 .18851,.20422,.21992,.23562,.25131, 201 .26701,.28272,.29844,.31416, 202 .32984,.34552,.36122,.37693,.39264, 203 .40835,.42407,.4398,.45552, 204 .47124,.48696,.50267,.51838,.53409, 205 .54979,.5655,.58121,.59691, 206 .61262,.62832,.64403,.65973,.67544, 207 .69115,.70686,.72257,.73827, 208 .75398,.76969,.7854,.80111,.81682, 209 .83252,.84823,.86394,.87965, 210 .89536,.91106,.92677,.94248,.95819, 211 .9739,.9896,1.00531,1.02102, 212 1.03673,1.05244,1.06814,1.08385, 213 1.09956,1.11527,1.13098,1.14668, 214 1.16239,1.1781,1.19381,1.20952, 215 1.22522,1.24093,1.25664,1.27235, 216 1.28806,1.30376,1.31947,1.33518, 217 1.35089,1.3666,1.3823,1.39801,1.41372, 218 1.42943,1.44514,1.46085,1.47655, 219 1.49226,1.50797,1.52368,1.53939, 220 1.55509,1.5708,1.58651,1.60222, 221 1.61793,1.63364,1.64934,1.66505, 222 1.68076,1.69647,1.71217,1.72788, 223 1.7436,1.75932,1.77504,1.79075, 224 1.80647,1.82217,1.83788,1.85358, 225 1.86927,1.88496,1.9007,1.91642, 226 1.93214,1.94786,1.96357,1.97927, 227 1.99497,2.01067,2.02636,2.04204, 228 2.05777,2.07349,2.0892,2.10492, 229 2.12062,2.13633,2.15203,2.16773, 230 2.18342,2.19911,2.21483,2.23055, 231 2.24626,2.26197,2.27768,2.29338, 232 2.30909,2.32479,2.34049,2.35619, 233 2.3719,2.38761,2.40331,2.41902, 234 2.43473,2.45043,2.46614,2.48185, 235 2.49756,2.51327,2.52897,2.54467, 236 2.56037,2.57607,2.59178,2.60749, 237 2.6232,2.63891,2.65463,2.67035, 238 2.68604,2.70173,2.71742,2.73312, 239 2.74882,2.76453,2.78025,2.79597, 240 2.8117,2.82743,2.84311,2.8588,2.87449, 241 2.89019,2.9059,2.92161,2.93733, 242 2.95305,2.96878,2.98451,3.0002,3.0159, 243 3.0316,3.04731,3.06302,3.07873, 244 3.09444,3.11016,3.12587,3.14159 }; 245 246 private static final double[] psilds = { 247 .16457,.16455,.16449, 248 .16437,.16416,.16386,.16345, 249 .16292,.16223,.16139,.16037,.15916, 250 .15779,.15631,.15475,.15316, 251 .15157,.15002,.14856,.14722,.14604, 252 .14506,.14427,.14364,.14316, 253 .14281,.14257,.14242,.14235,.14233, 254 .14236,.14241,.14248,.14257, 255 .14267,.1428,.14294,.1431,.14327, 256 .14346,.14366,.14387,.1441, 257 .14433,.14457,.14481,.14506,.1453, 258 .14554,.14578,.14601,.14623, 259 .14645,.14665,.14685,.14704,.14722, 260 .1474,.14757,.14774,.1479, 261 .14806,.14821,.14835,.14849,.14862, 262 .14875,.14886,.14897,.14908, 263 .14917,.14925,.14933,.1494,.14945, 264 .1495,.14954,.14957,.14959, 265 .14961,.14961,.1496,.14959,.14956, 266 .14953,.14948,.14943,.14936, 267 .14928,.14918,.14908,.14896,.14883, 268 .14869,.14853,.14835,.14816, 269 .14796,.14774,.1475,.14725,.14698, 270 .14669,.14638,.14606,.14571, 271 .14533,.14494,.14452,.14407,.1436, 272 .1431,.14256,.14198,.14135, 273 .14067,.13992,.1391,.1382,.13722, 274 .13615,.13498,.13371,.13236, 275 .13093,.12942,.12786,.12623,.12456, 276 .12284,.12108,.11929,.11746, 277 .11561,.11373,.11182,.10987,.1079, 278 .1059,.10386,.1018,.0997,.09758, 279 .09542,.09325,.09106,.08885, 280 .08662,.08439,.08214,.07989,.07763, 281 .07537,.07311,.07085,.06859, 282 .06633,.06407,.06182,.05957,.05733, 283 .0551,.05287,.05066,.04846, 284 .04627,.04411,.04196,.03983,.03773, 285 .03566,.03362,.03161,.02964, 286 .0277,.0258,.02395,.02215,.02039, 287 .01869,.01705,.01547,.01396, 288 .0125,.01112,.00981,.00857,.0074, 289 .00631,.00531,.00439,.00356, 290 .00281,.00216,.00159,.0011,7.1e-4, 291 4e-4,1.8e-4,4e-5,0. }; 292 293 /** 294 * Fill in the psi vector for a 66 series airfoil. 295 * 296 * @param phi An array filled in by phep(). 297 * @param psi An existing array with 201 elements to be filled in 298 * by this method. 299 **/ 300 @Override 301 protected final void phps(double[] phi, double[] psi) { 302 double[] bb = new double[201]; 303 double[] cc = new double[201]; 304 double[] dd = new double[201]; 305 spline(201, philds, psilds, bb, cc, dd); 306 for (int i=0; i < 201; ++i) { 307 psi[i] = seval(201, phi[i], philds, psilds, bb, cc, dd); 308 } 309 } 310 311 /** 312 * Simple method to test this class. 313 **/ 314 public static void main(String[] args) { 315 316 DecimalFormat nf = (DecimalFormat)NumberFormat.getInstance(); 317 nf.setMaximumFractionDigits(5); 318 nf.setMinimumFractionDigits(5); 319 320 System.out.println("Start NACA66Series..."); 321 322 System.out.println("Creating a NACA 66-212 airfoil..."); 323 Airfoil af = new NACA66Series(0.2, 0.12, 1); 324 325 System.out.println("Airfoil = " + af.toString()); 326 327 // Output the upper surface of the airfoil. 328 List<Point2D> upper = af.getUpper(); 329 List<Double> ypArr = af.getUpperYp(); 330 System.out.println("upper.size() = " + upper.size() + ", ypArr.size() = " + ypArr.size()); 331 332 System.out.println(" X \t Y \t dy/dx"); 333 int length = upper.size(); 334 for (int i=0; i < length; ++i) { 335 Point2D o = upper.get(i); 336 System.out.println(" " + nf.format(o.getX()) + "\t" + nf.format(o.getY()) + 337 "\t" + nf.format(ypArr.get(i))); 338 } 339 340 System.out.println("# ordinates = " + length); 341 System.out.println("Done!"); 342 } 343} 344 345