Multi-barrel exhaust gas recirculation mixer

A method of mixing exhaust gas and air in an exhaust gas recirculation mixer, the method comprising:

• directing a first fluid to each of a plurality of mixing tubes along a plurality of first flow paths, wherein the first fluid comprises one of air or exhaust gas;
• and
• directing a second fluid to each of the plurality of mixing tubes along a plurality of second flow paths, wherein the second fluid comprises the other of air or exhaust gas;
• wherein each of the mixing tubes comprises a throat in which a corresponding one of the first flow paths merges with a corresponding one of the second flow paths such that the air and the exhaust gas mix within the mixing tubes to thereby provide a mixture of exhaust gas and air;
• and
• wherein each throat has a constant diameter along a length thereof.

An exhaust gas recirculation mixer operable to receive a first fluid via a first fluid intake and to receive a second fluid via a second fluid intake, wherein one of the first fluid or the second fluid comprises air, and wherein the other of the first fluid or the second fluid comprises exhaust gas, the exhaust gas recirculation mixer comprising:

• a plurality of mixing passages, each comprising a corresponding and respective throat, wherein each throat is defined as a constant-diameter section of the corresponding mixing passage;
• a plurality of outer nozzles, each of the outer nozzles leading to the throat of a corresponding one of the mixing passages;
• an outer passage surrounding one or more of the throats and connecting the first fluid intake with a corresponding one of the outer nozzles;
• and
• a plurality of inner nozzles connected with the second fluid intake, wherein each of the inner nozzles extends into a corresponding one of the throats via a corresponding one of the outer nozzles.