NOISE ABSORPTION EQUIPMENT OF JET PROPULSION MECHANISM FOR SUPERSONIC AIRCRAFT

摘要

PURPOSE: To maintain a noise absorption function of noise absorption equipment at high temperature so as to reduce the volume of jet noise by providing a noise absorption material made of perforated plate and honeycomb positioned between a nozzle plate and a liner, and cooling the noise absorption equipment by cool air injected into the honeycomb through pores of the perforated plate along the nozzle plate. ;CONSTITUTION: This equipment comprises a nozzle plate 5, a liner 1, a perforated plate 4, a honeycomb 2 or the like. A noise absorption material is made of the honeycomb 2 and the perforated plate 4. On one surface of the honeycomb 2 positioned between the nozzle plate 5 and the liner 1, the perforated plate 4 is attached. On the other surface, a spacing side of the liner 1 is attached. A plurality of holes 11 are provided on the perforated plate 4 for introducing cool air injected from pores 10 of the perforated plate 4 into the honeycomb 2 and running against the spacing portion of the liner 1 into a fuel path through the holes 11. Thermal breakage caused by increasing temperature is prevented and a noise absorption function can be maintained.;COPYRIGHT: (C)1996,JPO