Accession Number : ADD007373

Title :   Multiple Shock Aerodynamic Window.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Shen,Peter I

Report Date : 10 Jun 1980

Pagination or Media Count : 7

Abstract : A MULTIPLE SHOCK AERODYNAMIC WINDOW IS DISCLOSED FOR USE WITHIN A LASER SYSTEM. The aerodynamic window provides separation between the pressure within the laser cavity and the ambient pressure adjacent thereto. Making up the aerodynamic window is an entrance duct and a capture duct situated transverse to a laser beam output passageway leading from the laser cavity. A wedge-shaped element is located in the entrance duct, partially protruding into the passageway. A diffuser vane is located in the capture duct. Upon the passing of a supersonic flow of gas through the entrance duct at least two shock waves are generated at the wedge-shaped element and cross the passageway. The diffuser vane intersects at least one of the shock waves thereby substantially reducing flow separation in the capture duct. In addition, the entrance wall of the capture duct may be inclined at an angle of approximately 16 deg in order to assist the diffuser vane in the reduction of flow separation in the capture duct. (Author)

Descriptors :   *Patents, *Gas lasers, *Windows, Aerodynamic forces, Flow separation, Shock waves, Supersonic flow, Wedges, Compression, Supersonic nozzles

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE