In poly aerofoil body of revolution and poly aerofoil body of revolution

摘要

PPROBLEM TO BE SOLVED: To provide a multi-wing rotor capable of suppressing generation of low frequency sound "not less than" of frequency sound of "revolution numbernumber of wing". PSOLUTION: In the multi-wing rotor 1 having a large number of wings 1a, total sheet number of the wing 1a is n sheets, an arrangement pattern of a wing pitch angle, i.e., an angle clamping the wing 1a forms false random series making the n sheets as one cycle. When an angle clamping the wing 1a is given to angles of two kinds of SB1/SB, SB2/SB, an inter-wing angle between the wings is made to SB2/SBwhen the angles clamping the wing 1a are aligned in the order of "SB1/SB, SB2/SB", and the inter-wing angle between the wings is made to SB1/SBwhen the angles clamping the wing 1a are aligned in the order of "SB2/SB, SB1/SB". Based on the conversion rule making the inter-wing angle between the wings to (SB1/SB/2+SB2/SB/2) when the angles clamping the wing 1a are aligned in the order of "SB1/SB, SB1/SB" or "SB2/SB, SB2/SB", it has a wing arrangement comprising the inter-wing angle of three kinds ofSB1/SB, SB2/SBand (SB1/SB/2+SB2/SB/2). PCOPYRIGHT: (C)2009,JPO&INPIT