公开(公告)号：US3589379A

公开(公告)日：1971-06-29

申请号：US3589379D

申请日：1969-02-17

Applicant: MC DONNELL DOUGLAS CORP

Inventor： DAUES JAMES J ,  HARGRAVES DAVID P

IPC: F02C7/042 ,  F02B27/02

CPC classification number: F02C7/042 ,  Y10T137/0536

Abstract: A jet engine inlet duct resembling a duct of the internal compression variety, but having a vent opening in one of its sidewalls for allowing spillage of a sufficient amount of air to permit the establishment of a shock wave system in the duct as the aircraft accelerates to supersonic speeds. The shock wave system includes a normal shock wave which passes downstream in the duct to a throat area therein, and the vent further extends across the region of the normal shock to afford spillage of a limited amount of air from the subsonic region behind the normal shock wave. The duct also includes a rocking ramp pivoted intermediate its ends about an axis transverse to the channel through the duct. The leading edge of the ramp is located forwardly of the channel while its trailing end is in the channel, and accordingly the capture area and throat area of the duct are changed as the inclination of the ramp changes. A sideplate extends downwardly from the ramp so that the inlet functions similar to an internal compression inlet.