Pneumatic and structural feature considered three-dimensional geometric structure of fan blade of aircraft engine
A technology with structural features and three-dimensional geometry, which is applied in the direction of engine components, machines/engines, blade support elements, etc., can solve the problems of large flow separation loss, excessive stress at the root extension section, and difficulty in blade installation, so as to improve the import conditions , improve efficiency and reduce the effect of Mach number
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[0020] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
[0021] A three-dimensional geometric structure of the connotation blade of a large fan of a civil aviation engine that takes into account both aerodynamic and structural characteristics, wherein the connotation blade refers to the 0-20% blade height part of the large fan blade, which is characterized by:
[0022] 1. The exit metal angle β of the 2 elementary leaf shape of the inner blade 2k (Such as figure 2 As shown, the tangent and axial direction of the middle arc at the trailing edge point The included angle, clockwise is positive) The distribution along the spread height can be described by a cubic polynomial
[0023] y=79.804x 3 +70.411x 2 +33.222x-8.62
[0024] Among them, x is the percentage of the relative extension, y is the exit metal angle of the corresponding leaf height element blade profile, in degrees (°), and the tolerance range o...
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