US 11,788,436 B2
Exhaust casing of a turbomachine with improved aerodynamics
Sylvain Yves Jean Duval, Moissy-Cramayel (FR); Arnaud Lasantha Genilier, Moissy-Cramayel (FR); Fabien Stephane Garnier, Moissy-Cramayel (FR); and Ludovic Pintat, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
Filed on Apr. 15, 2020, as Appl. No. 16/849,802.
Claims priority of application No. 1904059 (FR), filed on Apr. 16, 2019.
Prior Publication US 2020/0332680 A1, Oct. 22, 2020
Int. Cl. F01D 25/24 (2006.01); F02K 1/04 (2006.01); F01D 9/04 (2006.01); F02C 7/20 (2006.01)
CPC F01D 25/246 (2013.01) [F01D 9/04 (2013.01); F01D 25/243 (2013.01); F02C 7/20 (2013.01); F02K 1/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A turbomachine exhaust casing extending about an axis and comprising
a hub extending about the axis;
an external ferrule having an internal surface and an external surface, the external ferrule including a first angular section and a second angular section;
arms which extend between the hub and the external ferrule,
attachment yokes radially projecting toward the outside of the external ferrule; the attachment yokes being disposed along the second angular section of the external ferrule;
pockets disposed on the internal surface of the external ferrule and below each attachment yoke, each pocket extending from the internal surface of the external ferrule in a radial direction toward the inside of the external ferrule; each pocket extending from each corresponding arm and surrounds the corresponding arm radially disposed below each yoke, each said arm projecting from a corresponding pocket toward the hub, each said pocket being configured to reinforce the yoke;
a gas flow duct extending about the axis, the gas flow duct disposed annularly between the hub and the external ferrule, and the gas flow duct including a constant first radius;
a ring portion which extends radially under the pockets and forms a duct wall by delimiting with the hub a first portion of the gas flow duct, the pockets being radially disposed above the gas flow duct, the gas flow duct having a second portion defined by the first angular section of the external ferrule and the hub, the first portion and the second portion of the gas flow duct constituting a complete section of the gas flow duct, and the second angular section of the external ferrule including a second radius greater than the first radius.