INTERNAL COMBUSTION ENGINE SILENCE Russian patent published in 1996 - IPC

FIELD: suppression of exhaust noise of internal combustion engines and partial recovery of exhaust gas energy. SUBSTANCE: silencer has cylindrical housing, coaxial intake and exhaust branch pipes, central pipe, coaxial longitudinal cylindrical perforated partitions, gas ducts inlet and outlet manifolds and heat insulation. Passage areas in perforated cylindrical partitions and in perforated central pipe are equal to each other and twice as much of area of cross section of inlet manifold. Number and diameters of perforations in central pipe and longitudinal cylindrical pertitions, as well as diameters and lengths of longitudinal cylindrical perforated partitions and central perforated pipe are related by definite relationship on base of golden proportion principle; thus coefficient of perforation in all longitudinal partitions and central pipe remains constant which makes it possible to obtain similar throughput over entire aerodynamic path of cooling working medium, to enhance efficiency of noise suppression and provide for unification of internal structural members. EFFECT: enhanced efficiency of noise suppression through stabilization of motion of cooling medium through internal aerodynamic path. 2 cl, 2 dwg