Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1981-09-29
1984-08-07
Cohan, Alan
Fluid handling
Processes
Cleaning, repairing, or assembling
244 53B, B64D 3302
Patent
active
044637721
ABSTRACT:
A flush inlet and inlet air passage for supersonic aircraft including provisions for efficiently decelerating a supersonic airstream entering the inlet and converting such airstream to subsonic airflow within the inlet air passage prior to introduction into the aircraft's jet propulsion engine. More specifically, a two-dimensional inlet and convergent/divergent inlet air passage for supersonic jet aircraft wherein the inlet is flush with the aircraft's external surface, and the supersonic airflow entering the inlet is reduced to transonic or subsonic velocity by means of a series of weak shock waves as the airstream transits the convergent portion of the inlet passage and, thereafter, the subsonic or transonic flow is further decelerated as it transits the divergent portion of the inlet passage prior to introduction into the engine; such inlet including: (i) an expansion corner at the upstream leading edge of the inlet for turning and expanding the freestream airflow; (ii) provision for inflight optimization of the inlet cant angle at the expansion corner as a function of the actual Mach number; (iii) provision for inflight adjustment of the inlet passage boundary walls as a function of the speed and pressure of the inlet airflow; and (iv), means for removing excess low energy boundary layer air from the inlet passage surfaces to insure formation of a proper shock wave pattern to effect airflow deceleration. An exemplary supersonic flush inlet designed for operation at speeds of Mach 2.2, and below, has been illustrated; and, provision is made for increasing the pressure of the low energy boundary layer air extracted from the inlet passage to levels which readily permit of overboard discharge.
REFERENCES:
patent: 2721715 (1955-10-01), Hoadley
patent: 3041827 (1962-07-01), Ferri
patent: 3265331 (1966-08-01), Miles
patent: 3624751 (1971-11-01), Dettling
patent: 3752422 (1973-08-01), Runnels
Cohan Alan
The Boeing Company
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