| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that an end wall contour causes problems on manufacturing and implementation similar in casting a recess or disadvantageously causes the need for a wavy under-platform friction damper for rotor blades. <P>SOLUTION: An airfoil 10 includes a positive pressure surface 12 and a negative pressure surface 11. The positive pressure and the negative pressure surfaces 12, 11 have radially corresponding surface characteristics at spanwise local portions of the airfoil 10 that cooperatively define one or more of a camber line C<SB>R</SB>and a thickness distribution plot T<SB>R</SB>of the airfoil 10 as having a radius of curvature with two or more sign inversion points. The number of the sign inversion points is decreased along a radial dimension of the airfoil 10 measured from the spanwise local portion. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
