US 11,788,488 B2
Featured bullnose ramp for a thrust reverser system
Radhakrishna Chilukuri, San Diego, CA (US); Ashok Babu Saya, Bangalore (IN); and Hussain Mahamed Javed Tapadar, Bengaluru (IN)
Assigned to ROHR, INC., Chula Vista, CA (US)
Filed by Rohr, Inc., Chula Vista, CA (US)
Filed on Aug. 18, 2021, as Appl. No. 17/405,510.
Claims priority of application No. 202011035504 (IN), filed on Aug. 18, 2020.
Prior Publication US 2022/0112864 A1, Apr. 14, 2022
Int. Cl. F02K 1/72 (2006.01); F02K 1/82 (2006.01)
CPC F02K 1/72 (2013.01) [F02K 1/82 (2013.01); F05D 2220/323 (2013.01); F05D 2240/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An assembly for an aircraft propulsion system, comprising:
a forward thrust duct; and
a thrust reverser system comprising a thrust reverser duct, a bullnose ramp, a plurality of protrusions and a cascade;
the bullnose ramp adapted to provide a transition from the forward thrust duct to the thrust reverser duct when the thrust reverser system is in a deployed configuration; and
the plurality of protrusions bonded or formed integral with the bullnose ramp, each of the plurality of protrusions adapted to interact with boundary layer fluid flowing along an upstream portion of the bullnose ramp from the forward thrust duct into the thrust reverser duct when the thrust reverser system is in the deployed configuration;
the cascade comprising a plurality of flow channels, a first of the plurality of flow channels circumferentially adjacent a second of the plurality of flow channels;
a first of the plurality of protrusions circumferentially aligned with the first of the plurality of flow channels, a second of the plurality of protrusions is circumferentially aligned with the second of the plurality of flow channels, and the second of the plurality of protrusions is circumferentially adjacent the first of the plurality of protrusions;
a third of the plurality of protrusions circumferentially aligned with the second of the plurality of flow channels, and the third of the plurality of protrusions circumferentially adjacent the second of the plurality of protrusions; and
a first circumferential distance between the first of the plurality of protrusions and the second of the plurality of protrusions greater than a second circumferential distance between the second of the plurality of protrusions and the third of the plurality of protrusions, the first circumferential distance decreasing as the first of the plurality of protrusions extends axially towards the first of the plurality of flow channels, and the second circumferential distance increasing as the second of the plurality of protrusions extends axially towards the second of the plurality of flow channels.