| 摘要 |
1,075,028. Silencing gaseous streams. KOPPERS CO., Inc. Nov. 16, 1965 [Jan. 11, 1965], No. 48711/65. Heading F1B. A hollow pyramid structure is located in the gaseous stream with its apex pointing downstream. The pyramid includes a circular base 21 and five sides each comprising a main member 23 and branch members 27. Cooling water flows from inlet 28 through the hollow base 21, the hollow members 23 and 27 and finally into the gaseous stream through orifices 41 in the members 27. Each branch member 27 may be formed in two parts welded to the respective member 23 or, as shown, one part passing through member 23 and provided with an aperture 30 for coolant flow. A ground-based silencer for jet aircraft, Figs. 3 and 4 (not shown), comprises a pyramid structure supported by fins in a duct located downstream of and coaxial with the aircraft exhaust nozzle. The duct and a stack, into which the duct leads, may be double-walled with sound absorbing material between the walls. Air is drawn into the duct through lateral intakes adjacent the pyramid. |
