US 12,378,932 B2
Gas turbine engine having a heat exchanger located in an annular duct
Scott Alan Schimmels, Miamisburg, OH (US); Jeffrey Douglas Rambo, Mason, OH (US); Timothy Richard DePuy, Liberty Township, OH (US); and Steven B. Morris, Mason, OH (US)
Assigned to General Electric Company, Evendale, OH (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Feb. 2, 2024, as Appl. No. 18/430,907.
Application 18/430,907 is a continuation in part of application No. 18/160,375, filed on Jan. 27, 2023, granted, now 11,927,134.
Prior Publication US 2025/0012236 A1, Jan. 9, 2025
Int. Cl. F02K 3/115 (2006.01); F02K 3/04 (2006.01); F02K 7/12 (2006.01)
CPC F02K 3/115 (2013.01) [F02K 3/04 (2013.01); F05D 2260/213 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas turbine engine defining a centerline, a radial direction, and a circumferential direction, the gas turbine engine comprising:
a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order;
a rotor assembly driven by or incorporated into the turbomachine and operable at a blade passing frequency (f) greater than or equal to 300 hertz and less than or equal to 12,500 hertz during an operating condition of the gas turbine engine, the gas turbine engine comprising a substantially annular duct relative to the centerline, the substantially annular duct defining a flowpath and a duct height along the radial direction; and
a heat exchanger positioned at a location within the substantially annular duct and extending substantially continuously along the circumferential direction, the heat exchanger defining a heat exchanger height equal to at least 10% of the duct height;
wherein an effective transmission loss (ETL) for the heat exchanger positioned within the substantially annular duct is between 5 decibels and 1 decibels for the operating condition;
wherein the heat exchanger comprises a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition, the OARR equal to:

OG Complex Work Unit Math
wherein a is representative of a speed of sound through the location of the gas turbine engine during the operating condition and is greater than or equal to 11,600 inches per second and less than or equal to 30,924 inches per second during the operating condition.