US 11,920,500 B2
Passive flow modulation device
Steven Douglas Johnson, Milford, OH (US); Yu-Liang Lin, Mason, OH (US); Craig Alan Gonyou, Blanchester, OH (US); Scott Alan Schimmels, Miamisburg, OH (US); Jeffrey Douglas Rambo, Mason, OH (US); and Brian Gregg Feie, Cincinnati, OH (US)
Assigned to General Electric Company, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Aug. 30, 2021, as Appl. No. 17/461,113.
Prior Publication US 2023/0066740 A1, Mar. 2, 2023
Int. Cl. F01D 9/06 (2006.01); F01D 5/08 (2006.01)
CPC F01D 9/06 (2013.01) [F01D 5/081 (2013.01); F05D 2240/128 (2013.01); F05D 2260/232 (2013.01); F05D 2260/606 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A passive flow modulation device for a machine defining an axial direction and a radial direction, the passive flow modulation device comprising:
a first ring with a first coefficient of thermal expansion;
a second ring disposed coaxially with the first ring and positioned at least partially inward of the first ring along the radial direction, spaced from the first ring along the axial direction, or both, the first ring, the second ring, or both defining at least in part one or more passages defining a helical shape, the second ring with a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion to passively modulate a size of the one or more passages during operation, and wherein at least one of the first and second rings is configured to change size radially in at least one of an inward or outward direction.