Propulsion nozzles with improved sound suppression

Abstract

Abstract TWO FORMS OF SOUND SUPPRESSOR FOR CONVERGENT, DIVERGENT PROPULSION NOZZLES ARE SHOWN. IN BOTH, THE FLAPS OF THE CONVERGENT, PRIMARY NOZZLE ARE SWUNG TO A DIVERGENT POSITION IN SEALING ENGAGEMENT WITH AN END WALL HAVING A PLURALITY OF TUBES THROUGH WHICH THE HOT GAS STREAM IS DISCHARGED TO MINIMIZE NOISE GENERATION. ALSO IN BOTH FORMS, THE SUPPRESSOR END WALL IS FORMED, AT LEAST IN PART, BY SECTORS WHICH ARE SWUNG TO STOWED POSITIONS IN WHICH THEY FORM A PART OF THE DIVERGENT EXPANSION SURFACE OF THE NOZZLE. IN ONE FORM, THE SECTORS ARE PIVOTED FROM THE NOZZLE STRUCTURE TO FORM THE ENTIRE END WALL AND THE FLAPS FORMING THE REMAINDER OF THE DIVERGENT NOZZLE ARE OPENED OUTWARDLY TO INCREASE FLOW OF SECONDARY AND TERTIARY AIR TO THE REAR SURFACE OF THE END WALL. IN THE OTHER FORM, THE SECTORS ARE MOUNTED ON A RING WHICH ALSO FORMS A PART OF THE END WALL AND THE RING IS TRANSLATABLE SO THAT IT AND THE SECTORS CAN BLOCK THE HOT GAS STREAM AND DISCHARGE IT THROUGH BLOW-IN DOORS TO PROVIDE REVERSE THRUST. BUTTERFLY VALVES IN THE TUBES ARE CLOSED TO PROVIDE SUFFICIENT BLOCKAGE FOR REVERSE THRUST.

Inventors

• 👤 Jeremiah P Wolf
• 👤 William V Sutherland
• 👤 Donald J Dusa

Bibliographic Details