US 12,241,410 B1
Engine nacelle anti-ice swirl system with unsteady fluid flow
Rene Woszidlo, Lawrence, KS (US); John Alexander Ziebart, Bellevue, WA (US); and Venkateswara K. Reddy, Bangalore (IN)
Assigned to The Boeing Company, Arlington, VA (US)
Filed by The Boeing Company, Arlington, VA (US)
Filed on Mar. 4, 2024, as Appl. No. 18/594,975.
Int. Cl. F02C 7/047 (2006.01); F01D 25/02 (2006.01); F01D 25/10 (2006.01)
CPC F02C 7/047 (2013.01) [F01D 25/02 (2013.01); F01D 25/10 (2013.01); F05D 2220/323 (2013.01); F05D 2260/213 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An engine anti-ice (EAI) swirl system for an aircraft engine, the EAI swirl system comprising:
a nacelle including a first nacelle section exposed to ambient environment and facing an oncoming airstream when an aircraft powered by the engine is in flight, wherein the first nacelle section defines a circumferential D-duct; and
a nozzle configured to generate a pulsating jet of heated fluid and inject into and circulate through the D-duct an unsteady flow of the heated fluid, wherein the unsteady flow mixes the heated fluid within the D-duct to generate a uniform temperature distribution to counter origination of hot and cold spots within the D-duct and minimize likelihood of icing of the first nacelle section when the aircraft is in flight.