|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||60/226R ; 60/269 ; 415/119 ; 415/145|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 23 인용 특허 : 0|
This invention is an improved turbofan engine having a variable geometry fan duct which reduces stator source noise emitted from the engine. Attached to the inner wall of the fan casing near the fan stators is a pneumatically actuated annular membrane having two operating positions. In the cruise position, the membrane is forced radially inward to press against the radially outermost tips of the fan stators. In the second position, used during approach and takeoff, the membrane is drawn against a recessed portion in the fan casing, thereby creating an an...
A gas turbine engine of the type commonly known as a turbofan comprising: a core engine; a centerbody enclosing said core engine and having an outer wall; a fan rotor located near the forward end of said core engine; a fan casing having an inner wall enclosing said rotor and forming an annular duct between said inner wall thereof and the outer wall of said centerbody for the passage of air through the engine; a row of fan stators located downstream of said rotor, attached to said centerbody, and extending radially outward therefrom, each of said stators ...