Patent ID: 7966825

Claim:
An exhaust eductor system in a compartment of an auxiliary power unit, comprising: a primary exhaust nozzle configured to transport an active flow stream, the primary exhaust nozzle terminating with a nozzle end; a mixing duct at least partially surrounding the primary exhaust nozzle and configured to transport a passive flow stream that is entrained by mixing with the active flow stream from the primary exhaust nozzle, the mixing duct having an interior; a baffle on the interior of the mixing duct, downstream of the nozzle end, and configured to prevent the mixed flow streams from exiting the mixing duct back into the auxiliary power unit compartment; wherein the baffle has an upstream end attached to the mixing duct and terminates at a downstream end, the baffle having generally straight edges extending from the upstream end to the downstream end; and wherein the downstream end is circular.