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The feature to notice most about ADVENT is the unusual extra duct for bypass air seen running along the top and bottom of the engine. This is the critical third flowpath which will be opened or closed as part of a variable cycle to transform it from a strike aircraft engine to a transport-type engine, or vice-versa. If the flowpath is open the bypass ratio will increase, reducing fuel burn, and enabling range to increase in a subsonic strike engine by 40% and loiter time by up to 60%. If the ducts are closed, additional air is forced through the core and high pressure compressor, enabling thrust and speed to increase.
The impact is even more dramatic on the more extreme cycle of a supersonic strike engine. With ducts closed for maximum performance in the combat zone, the flow would be opened up again for the transit to and from the target, resulting in increased engine efficiencies which would give up to an 80% range increase and a staggering 135% increase in loiter time.
The new core of HEETE, which will feature a pressure ratio rumored to be in the 70:1 range, is what’s causing all the excitement. A leap beyond the advanced compressors on fifth generation high bypass turbofans like the GEnx and Rolls-Royce Trent 1000, it could give US engine makers – military and civil – an unbeatable advantage in the next decade and beyond.
Guy Norris - Ares