US 2009/0255242 A1 · Low Pressure Drop Mixer for Radial Mixing of Internal Combustion Engine Exhaust Flows, Combustor Incorporating Same, and Methods of Mixing

Abstract

An exhaust aftertreatment system is provided. The exhaust aftertreatment system includes a mixing arrangement for mixing flows of exhaust along a flow path. The mixing arrangement radially and angularly rearranges segments of two different portions of flow to mix the different portions of flow. The mixing arrangement initially converts a generally radially stratified temperature profile into an angularly stratified temperature profile to increase surface area between cool segments of exhaust gas and hot segments of exhaust gas. The aftertreatment system may also include a combustion chamber, a combustor housing and a combustor liner. The mixing arrangement is downstream from the combustion chamber to direct radially outward hot gas passing through the combustor liner and to direct radially outer cool gas passing between the liner and the combustor housing radially inward in an interleaving fashion.

Claims25

Dependent claims

A method of mixing a flow of exhaust flowing along a flow axis including the step(s) of:

rearranging the flow of exhaust along the flow axis, including the steps of:
directing a first portion of the flow radially outward away from the flow axis, and
directing a second portion of the flow radially inward toward the flow axis;
and
wherein the steps of directing the first and second portions includes separating the first portion into a plurality of first segments and directing the first segments radially outward and separating the second portion into a plurality of second segments and directing the second segments radially inward, wherein the step of rearranging includes increasing the surface area between the first and second portions.

2 more elements

An exhaust gas mixer for interleaving portions of a flow of exhaust gas from an internal combustion engine comprising:

a plurality of first flow directing tabs;
a plurality of second flow directing tabs;
the first and second flow directing tabs arranged to circumscribe a flow axis;
and
the first flow directing tabs arranged to direct radially inward exhaust flow radially outward;
and
the second flow directing tabs arranged to direct radially outer exhaust flow radially inward.

4 more elements

Dependencies are inferred from the claim text.

Low Pressure Drop Mixer for Radial Mixing of Internal Combustion Engine Exhaust Flows, Combustor Incorporating Same, and Methods of Mixing

Life of this patent

Low Pressure Drop Mixer for Radial Mixing of Internal Combustion Engine Exhaust Flows, Combustor Incorporating Same, and Methods of Mixing

Life of this patent

Abstract

Claims25