Patent ID: 7971432
Filing Date: 2011-07-05
Classification: F01N

Abstract:
1. A flow diffuser for vehicles of the type having an engine and an exhaust pipe, the flow diffuser comprising: (a) a substantially tubular body having an outer surface and a first end configured for attachment to an exhaust pipe; and (b) a diffusion portion in gaseous communication with the tubular body and including a plurality of channels extending outward from the outer surface of the tubular body, each channel having a root end located near the outer surface, an exit port, and a channel axis extending between the root end and the exit port, each of the plurality of channels increasing in flow area along the channel axis to reduce exhaust gas velocity, wherein the diffusion portion includes fluid passageways for the passage of surrounding air between adjacent channels and wherein each exit port has a shape factor of less than about 0.7; wherein the shape factor is defined by a cross-section of the channel transverse to the channel axis according to the formula 4π*area/(perimeter)