Additively controlled surface roughness for designed performance

Patent metadata

Field	Value
Publication number	US-11242769-B2
Application number	US-201816221991-A
Country	US
Kind code	B2
Filing date	Dec 17, 2018
Priority date	Dec 17, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A process for additively controlled surface features of a gas turbine engine casing. The process comprises forming the casing having an inner surface and an outer surface opposite the inner surface; forming a surface feature on the casing proximate the inner surface, wherein the surface feature comprises a structure on the inner surface configured to align or misalign with respect to a flow direction of a working fluid in a flow path of the casing.

First claim

What is claimed is:

1. A casing with surface features for an attritable gas turbine engine comprising:
a flow passage defined within said casing of the attritable gas turbine engine;
the flow passage comprising an exterior portion and an interior portion opposite said exterior portion; and
the surface features being formed in said flow passage on an inner surface of said interior portion, wherein said surface features comprise a structure formed unitary with the interior portion configured to reduce a flow resistance of a fluid flow,
wherein said surface features are selected from the group consisting of dimples, ridges, nubs, lumps, protuberances, furrows, voids, gaps, fissures, hollows, trenches, pockets, bumps, lumps, knobs, projections, protrusions, prominences, outcrops, outgrowths, juts, jags, and snags.

2. The casing with surface features according to claim 1 , wherein said surface features comprise the same material composition as said casing.

3. The casing with surface features according to claim 1 , wherein said surface features are configured to provide a predetermined resistance to a flow of a working fluid.

4. A casing with surface features for an attritable gas turbine engine comprising:
a flow passage defined within said casing of the attritable gas turbine engine;
the flow passage comprising an exterior portion and an interior portion opposite said exterior portion; and
the surface features being formed in said flow passage on an inner surface of said interior portion, wherein said surface features comprise a structure formed unitary with the interior portion configured to reduce a flow resistance of a fluid flow, wherein said surface features comprise a plurality of scallop shapes.

5. The casing with surface features according to claim 4 , wherein said surface features comprise the same material composition as said casing.

6. The casing with surface features according to claim 4 , wherein said surface features are configured to provide a predetermined resistance to a flow of a working fluid.

7. The casing with surface features according to claim 4 , wherein said plurality of scallop shapes include curved edges oriented downstream relative to a flow direction of a working fluid in the flow passage of said casing.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Jagdale Vijay Narayan
• Boyer Jesse R
• Sharma Om P
• Butcher Evan
• Binek Lawrence
• Dods Bryan G

Classifications

• B23K26/0006 Primary

  taking account of the properties of the material involved (B23K26/32, B23K26/40 take precedence) · CPC title

• B22F10/38

  to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures · CPC title

• B22F10/25

  Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] · CPC title

• B22F10/366

  Scanning parameters, e.g. hatch distance or scanning strategy · CPC title

• F01D25/24 Primary

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title