Exhaust mixer and apparatus using same

An apparatus, comprising:

• an engine operable to discharge an exhaust flow and a mixer coupled to said engine along a centerline axis to mix the exhaust flow with cooling air, said mixer including:
• a passage extending from an inlet to an outlet along said centerline axis;
• a number of lobes each defining a different one of a number of inner chutes, said inner chutes each opening into said passage and being shaped to block any line-of-sight view of said engine therethrough by twisting about said centerline axis;
• and
• several fins each projecting into said passage from an inner surface bounding said inner chutes or said passage, wherein one or more of said fins are in the form of a vane defining a passageway in fluid communication with a corresponding one of said outer channels.

An apparatus, comprising:

• a gas turbine engine operable to produce an exhaust flow and a mixer coupled to said engine along an axis to mix the exhaust flow with cooling air, said mixer including:
• a passage positioned along said axis to convey said exhaust flow therethrough;
• several inner chutes circumferentially disposed about said passage;
• several outer chutes circumferentially disposed about said passage, said outer chutes each being positioned between a respective pair of said inner chutes;
• and
• a number of vanes each extending into said passage from an inner surface of said mixer, one or more of said vanes each including a passageway in fluid communication with a corresponding one of said outer chutes.