WIND TURBINE BLADE PLANFORMS WITH TWISTED AND TAPERED TIPS

摘要

A blade for a wind turbine includes a total backward twist of between approximately 6 degrees and approximately 15 degrees between an outer approximately 1 percent to 10 percent of a rotor radius of the blade; and an approximate planform distribution within the following ranges r/R c/R(LE) c/R(TE) .96 0.60 to 0.65% -1.42 to -1.34% .968 0.54 to 0.59% -1.31 to -1.34% .974 0.39 to 0.58% -1.36 to -1.22% .9806 0.13 to 0.57% -1.45 to -1.06% .9856 -0.23 to 0.56% -1.56 to -0.74% .9906 -0.76 to 0.55% -1.74 to -0.24% .9956 -1.44 to 0.54% -1.99 to 0.23% 1.00 -2.17 to 0.54% -2.27 to 0.44% where "r/R" is an approximate normalized distance outward from a center of rotation of the blade along a span of the blade; and "c/R(LE)" and "c/R(TE)" are approximate relative positions of a leading (LE) and trailing edge (TE) of a chord "c" expressed as a percentage of a distance outward from the center of rotation at each r/R.