| 摘要 |
#CMT# #/CMT# The device has a row of rectilinear filaments (1) fixed on a trailing edge (4) of a solid body e.g. blade (2), by using an elastic body, and perpendicular to the trailing edge. The filaments are made of Kevlar (RTM: aramid synthetic fiber), and have a length higher than 20 percentages of width of the solid body. The filaments are arranged in elongation of the trailing edge and directed towards rear part of the body with respect to flow direction of air (5). #CMT#USE : #/CMT# Device for reducing aero/hydro-dynamic noise from a solid body such as blade of an aircraft propeller, helicopter or windmill, in relative movement in a fluid i.e. air. Can also be used for a blade of a fan, pump, mast subjected to wind, propeller of a boat in liquid, aircraft wing, helicopter rotor, car or train, and for a terrestrial, aeronautical or submarine transport unit in military field. #CMT#ADVANTAGE : #/CMT# The device effectively reduces the aero/hydro-dynamic noise from the solid body rotating in the air, in a range higher than 5 or 12 decibels. The filaments are made of synthetic fiber in order to ensure better resistance against erosion. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic representation of an aero/hydro-dynamic noise reducing device. 1 : Rectilinear filaments 2 : Blade 3 : Separation surface 4 : Trailing edge 5 : Air. |
