# US 11,905,886 B2 · Heatshield for a gas turbine engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,886 B2 - Document ID: US11905886B2 - Status: Granted - Kind: B2 - Application number: 17/609,374 - Filed: 2020-05-20 - Published: 2022-06-09 - Granted: 2024-02-20 - Earliest claimed: 2019-05-29 - Assignees: Siemens Energy Global GmbH & Co. KG - Applicants: Siemens Energy Global GmbH & Co. KG - Inventors: Mats Kinell; Petr Laletin; Sara Rabal Carrera - Web page: https://patentgrep.com/patent/US11905886B2 ## CPC - F01D 11/18: using stator or rotor components with predetermined thermal response, e.g. selective insulation, thermal inertia, differential expansion - F02C 7/24: Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) - F01D 5/08: Heating, heat-insulating or cooling means {(specially adapted for radial flow machines or engines F01D5/04)} - F01D 9/04: forming ring or sector - F01D 11/24: by selectively cooling-heating stator or rotor components - F02C 7/12: Cooling of plants (of component parts, see the relevant subclasses, e.g. F01D; cooling of engines in general F01P) - F05D 2240/11: Shroud seal segments - F05D 2240/15: Heat shield - F05D 2260/221: Improvement of heat transfer - F05D 2260/22141: using fins or ribs - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - 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) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A heatshield for a gas turbine engine includes a main body having a leading edge, a trailing edge, lateral edges, a first surface and a second surface, the first surface being exposed to a hot working gas in use passing through the gas turbine engine. The main body having an array of cooling channels for conveying a coolant flow, where each cooling channel of the array of cooling channels having a surface. At least one cooling channel of the array of cooling channels includes at least one flow disturbing feature extending from the surface and into the cooling channel. ## Claims ### Claim 1 A heatshield for a gas turbine engine, comprising: a main body having a leading edge, a trailing edge, lateral edges, a first surface and a second surface, the first surface being exposed to a hot working gas in use passing through the gas turbine engine, the main body having an array of cooling channels for conveying a coolant flow, each cooling channel of the array of cooling channels having a surface, wherein at least one cooling channel of the array of cooling channels comprises at least one flow disturbing feature extending from the surface and into the cooling channel, wherein the at least one flow disturbing feature comprises a cross-sectional shape of a convex polygon, and wherein the cross-sectional shape comprises a diagonal line between opposite corners of the cross-sectional shape, and the diagonal line is in-line with a longitudinal extent of the cooling channel. ### Claim 2 (depends on 1) The heatshield as claimed in claim 1, wherein the at least one flow disturbing feature is a pin. ### Claim 3 (depends on 1) The heatshield as claimed in claim 1, wherein another at least one flow disturbing feature is a part-pin that is discrete from the at least one flow disturbing feature, the part-pin being attached along its length to another side of the cooling channel. ### Claim 4 (depends on 3) The heatshield as claimed in claim 3, wherein the another at least one flow disturbing feature comprises a second part-pin that is discrete from the at least one flow disturbing feature and discrete from the another at least one flow disturbing feature, wherein the part-pin and the second part-pin are arranged opposite one another across the cooling channel. ### Claim 5 (depends on 4) The heatshield as claimed in claim 4, wherein the at least one cooling channel comprises an array of the pin(s) and/or the part-pin(s) and/or the second/part pin(s) along at least a part of a length of the cooling channel. ### Claim 6 (depends on 1) The heatshield as claimed in claim 1, wherein the at least one flow disturbing feature has a plurality of side faces, and wherein an angle between any two neighbouring side faces is ≥45°. ### Claim 7 (depends on 1) The heatshield as claimed in claim 1, wherein the at least one cooling channel comprises a restrictor, the restrictor forming a smallest cross-sectional area within the cooling channel. ### Claim 8 (depends on 1) The heatshield as claimed in claim 1, wherein the array of cooling channels comprises a leading array of cooling channels and a trailing array of cooling channels, wherein each of the leading array of cooling channels and the trailing array of cooling channels comprises parallel cooling channels which each extend in a direction generally perpendicular to the leading edge and trailing edge, wherein the cooling channels of the trailing array of cooling channels are longer than the cooling channels of leading array of cooling channels. ### Claim 9 (depends on 8) The heatshield as claimed in claim 8, wherein the main body has a dimension (L) that is perpendicular to the leading edge and/or the trailing edge, and wherein the cooling channels of the trailing array of cooling channels extend 55-70% of L, and wherein the cooling channels of leading array of cooling channels extend 30-45% of L. ### Claim 10 (depends on 8) The heatshield as claimed in claim 8, wherein each cooling channel of the leading array of cooling channels having an outlet in the leading edge of the main body, and wherein each cooling channel of the trailing array of cooling channels having an outlet in the trailing edge of the main body. ### Claim 11 (depends on 1) The heatshield as claimed in claim 1, wherein each cooling channel has an inlet formed in the second surface. ### Claim 12 (depends on 1) The heatshield as claimed in claim 1, wherein cooling channels located closest to the lateral edges of the main body have a plurality of cooling outlets defined in a respective lateral edge such that in use coolant passes out of the cooling channel, through the plurality of cooling outlets and is exhausted at the respective lateral edge, wherein each cooling channel has an inlet formed in the second surface, and, wherein the inlet of the cooling channel(s) located closest to the lateral edges of the main body is larger than inlets of other cooling channels. ### Claim 13 (depends on 1) The heatshield as claimed in claim 1, wherein the at least one cooling channel has a cross-sectional shape that is polygonal. ### Claim 14 (depends on 2) The heatshield as claimed in claim 2, wherein the pin extends from one part of the surface to another part of the surface such that its sides are free of contact with the surface of the cooling channel. ### Claim 15 (depends on 5) The heatshield as claimed in claim 5, wherein the pin(s) and the part-pin(s) and/or the second/part pin(s) are arranged in an alternating pattern. ### Claim 16 (depends on 1) The heatshield as claimed in claim 1, wherein the cross-sectional shape of the at least one flow disturbing feature is a quadrilateral or a parallelogram. ### Claim 17 (depends on 9) The heatshield as claimed in claim 9, wherein the cooling channels of the trailing array of cooling channels extend 60% of L. ### Claim 18 (depends on 9) The heatshield as claimed in claim 9, wherein the cooling channels of leading array of cooling channels extend 40% L. ### Claim 19 (depends on 1) The heatshield as claimed in claim 1, wherein the at least one cooling channel has a cross-sectional shape that is quadrilateral, triangular, or trapezoidal. ### Claim 20 (depends on 1) The heatshield as claimed in claim 1, wherein the longitudinal extent of the cooling channel is a center line of the cooling channel.