ROTOR BLADE FOR ROTARY WING AIRCRAFT HAVING DEFORMABLE PROTRUSIONS TO REDUCE BVI NOISE(BLADE VORTEX INTERACTION NOISE)

摘要

PURPOSE: A rotor blade for a rotorcraft having variable protrusions for reducing blade vortex interaction noise is provided to enable BVI noise to be selectively reduced only if the reduction of the BVI noise is required, since a plurality of variable protrusions are formed on a leading edge. CONSTITUTION: A rotor blade(100) for a rotorcraft having variable protrusions for reducing blade vortex interaction noise comprises a body(10) and a variable protrusion(20). The body is connected to a shaft. The body comprises a leading edge(11), which is the front end on a rotating direction(A). The variable protrusion is arranged in plural on the leading edge of the body in a rotary radial direction(B). In order that the BVI noise, which occurs by colliding with the vortex occurring on the blade tip can be reduced only if selectively required, the variable protrusion is able to be deformed between a first shape, which is protruded forward on the rotating direction, and a second shape, which is not protruded forward on the rotating direction.