Tortuous path quiet exhaust eductor system

An exhaust eductor system comprising:

• a compartment inlet configured to allow cooling air to be drawn through a compartment, said compartment housing a gas turbine engine;
• an oil cooler;
• a primary nozzle downstream of said gas turbine engine;
• an oil cooler air plenum in air communication with said oil cooler and downstream of said oil cooler;
• an oil cooler air nozzle downstream of said oil cooler air plenum and disposed about said primary nozzle;
• a surge air plenum in air communication with a surge air duct;
• a surge air dump nozzle disposed about said oil cooler air nozzle and downstream of said surge air plenum, wherein said primary nozzle, said oil cooler air nozzle, and said surge air dump nozzle are formed so as to direct an exhaust flow from said gas turbine engine and entrain said cooling air and surge air along with said exhaust flow in a direction having both radial and axial components with respect to a centerline axis of said gas turbine engine;
• an eductor mixing duct angled away from said centerline axis of said gas turbine engine;
• and
• an exit duct angled toward said centerline axis of said gas turbine engine.

A method comprising steps of:

• mounting a primary nozzle downstream of a gas turbine engine;
• collecting oil cooling air in an oil cooler air plenum;
• mounting an oil cooler air nozzle about said primary nozzle and downstream of said oil cooler air plenum;
• entraining said oil cooling air through said oil cooler air plenum and said oil cooler air nozzle along with an exhaust flow from said gas turbine engine through said primary nozzle, wherein said oil cooling air is entrained in a direction having both a radial component and an axial component with respect to a centerline axis of said gas turbine engine;
• drawing said oil cooling air across an oil cooler;
• directing said exhaust flow and said oil cooling air into an eductor mixing duct wherein said eductor mixing duct is angled away from said centerline axis of said gas turbine engine;
• and
• turning said exhaust flow and said oil cooling air into an exit duct wherein said exit duct is angled toward said centerline axis of said gas turbine engine.