# US 12,110,824 B2 · Aircraft propulsion system with variable area inlet assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,824 B2 - Document ID: US12110824B2 - Status: Granted - Kind: B2 - Application number: 18/141,817 - Filed: 2023-05-01 - Published: 2023-08-24 - Granted: 2024-10-08 - Earliest claimed: 2021-01-27 - Assignees: Rohr, Inc. - Applicants: Rohr, Inc. - Inventors: Timothy Gormley - Web page: https://patentgrep.com/patent/US12110824B2 ## CPC - F02C 7/042: having variable geometry - B64D 33/02: of combustion air intakes - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT ## Abstract An assembly is provided for an aircraft propulsion system. This assembly includes a center body, a scarfed inlet structure and an inlet passage. The scarfed inlet structure extends circumferentially about the center body. The inlet passage is radially between and formed by at least the center body and the scarfed inlet structure. A first component of the assembly is configured to rotate about an axis relative to a second component of the assembly between: (A) a first position where a metering portion of the inlet passage has a first area; and (B) a second position where the metering portion has a second area. The first component is one of the center body or the scarfed inlet structure, and the second component is the other one of the center body or the scarfed inlet structure. ## Claims ### Claim 1 An assembly for an aircraft propulsion system, comprising: a center body; a scarfed inlet structure extending circumferentially about the center body; an inlet passage radially between and formed by at least the center body and the scarfed inlet structure, the inlet passage comprising a metering portion; and a turbine engine comprising a flowpath fluidly coupled with and downstream of the inlet passage; a first component of the assembly configured to rotate about an axis relative to a second component of the assembly between a first position where the metering portion has a first area; and a second position where the metering portion has a second area that is different than the first area; wherein the first component of the assembly comprises one of the center body or the scarfed inlet structure, and the second component of the assembly comprises the other one of the center body or the scarfed inlet structure; and wherein a centerline of the first component of the assembly is offset from a centerline of the turbine engine. ### Claim 2 (depends on 1) The assembly of claim 1, wherein the first component of the assembly comprises the center body, and the second component of the assembly comprises the scarfed inlet structure. ### Claim 3 (depends on 1) The assembly of claim 1, wherein the scarfed inlet structure has a leading edge; and a first point on the leading edge is axially displaced from a second point on the leading edge along the axis. ### Claim 4 (depends on 1) The assembly of claim 1, wherein a plane of an inlet orifice to the inlet opening passage is angularly offset from the axis. ### Claim 5 (depends on 1) The assembly of claim 1, wherein the center body includes a tubular surface that radially tapers as center body extends in a forward direction along the axis. ### Claim 6 (depends on 1) The assembly of claim 1, wherein the center body includes a tubular surface that radially tapers as center body extends in an aft direction along the axis. ### Claim 7 (depends on 1) The assembly of claim 1, wherein the center body includes a first tapered surface, a second tapered surface and a plateau surface that extends axially between the first tapered surface and the second tapered surface. ### Claim 8 (depends on 7) The assembly of claim 7, wherein the metering portion has an inner peripheral boundary; the inner peripheral boundary is formed by the plateau surface when the first component of the assembly is in the first position; and the inner peripheral boundary is formed by the plateau surface and the second tapered surface when the first component of the assembly is in the second position. ### Claim 9 (depends on 1) The assembly of claim 1, wherein the center body includes a plateau surface aligned with an inlet lip of the scarfed inlet structure; and a trailing edge of the plateau surface has a scarfed configuration. ### Claim 10 (depends on 1) The assembly of claim 1, wherein the center body includes a plateau surface with a trailing edge; and a first point on the trailing edge is axially displaced from a second point on the trailing edge along the axis. ### Claim 11 (depends on 1) The assembly of claim 1, wherein the scarfed inlet structure comprises a leading edge; the center body comprises a plateau surface with a trailing edge; the trailing edge is separated from the leading edge by a first axial distance along the axis when the first component of the assembly is in the first position; and the trailing edge is separated from the leading edge by a second axial distance along the axis when the first component of the assembly is in the second position, and the second axial distance is different than the first axial distance. ### Claim 12 (depends on 1) The assembly of claim 1, wherein the center body comprises a cylindrical surface with an axial length that changes as the cylindrical surface extends circumferentially about the axis. ### Claim 13 (depends on 1) The assembly of claim 1, wherein the centerline of the first component of the assembly is angularly offset from the centerline of the turbine engine. ### Claim 14 (depends on 1) The assembly of claim 1, wherein the centerline of the first component of the assembly is laterally offset from the centerline of the turbine engine. ### Claim 15 (depends on 1) The assembly of claim 1, wherein the center body comprises a double tapered center body. ### Claim 16 (depends on 1) The assembly of claim 1, wherein the first component of the assembly is configured to rotate less than one-hundred and eighty degrees about the axis relative to the second component of the assembly between the first position and the second position. ### Claim 17 An assembly for an aircraft propulsion system, comprising: a center body comprising a center body surface with a trailing edge; a nacelle inlet structure extending circumferentially around the center body, the nacelle inlet structure having a leading edge; an inlet passage radially between and formed by at least the center body and the nacelle inlet structure, the inlet passage comprising a metering portion; and a turbine engine comprising a plurality of flowpaths fluidly coupled in parallel to and downstream of the inlet passage; a first component of the assembly configured to rotate about a rotational axis of the first component of the assembly relative to a second component of the assembly between a first position where the metering portion has a first area, and where the trailing edge is axially displaced from the leading edge by a first distance; and a second position where the metering portion has a second area that is different than the first area, and where the trailing edge is axially displaced from the leading edge by a second distance that is different than the first distance; the first component of the assembly comprising one of the center body or the nacelle inlet structure; and the second component of the assembly comprising the other one of the center body or the nacelle inlet structure, and the rotational axis offset from a centerline of the turbine engine. ### Claim 18 (depends on 17) The assembly of claim 17, wherein the nacelle inlet structure comprises a scarfed inlet lip. ### Claim 19 (depends on 17) The assembly of claim 17, wherein the center body further includes a first tubular surface adjacent the center body surface; and the first tubular surface tapers radially inwards towards the rotational axis as the center body extends in a first direction along the rotational axis away from the center body surface. ### Claim 20 (depends on 19) The assembly of claim 19, wherein the center body further includes a second tubular surface adjacent the center body surface; and the second tubular surface tapers radially inwards towards the rotational axis as the center body extends in a second direction along the rotational axis away from the center body surface.