Method of manufacturing BOAS enhanced heat transfer surface

A method of manufacturing a seal, comprising:

• providing a seal arc segment defining first and second seal supports at circumferential ends, the seal arc segmant further defining radially inner and outer sides, the radially outer side including radially extending sidewalls and a radially inner surface joining the radially-extending sidewalls, the radially-extending sidewalls and radially inner surface defining a pocket;
• machining the radially inner surface to have a higher surface roughness than the sidewalls;
• machining a channel of a first depth at a first section of the radially inner surface;
• and
• machining a channel deeper than the first depth at a second section of the radially inner surface, wherein the first section is axially spaced from the second section.

A method of manufacturing a seal, comprising:

• providing a seal arc segment defining first and second seal supports at circumferential ends, the seal arc segment further defining radially inner and outer sides, the radially outer side including radially-extending sidewalls and a radially inner surface joining the radially-extending sidewalls, the radially-extending sidewalls and the radially inner surface defining a pocket;
• machining the radially inner surface to have a higher surface roughness than the sidewalls;
• machining channels spaced apart a first distance at a first section of the surface;
• and
• machining channels spaced apart a second distance at a second section of the radially inner surface, the first section axially spaced from the section, and the first distance different from the second distance.

A method of manufacturing a seal, comprising:

• providing a seal arc segment defining first and second seal supports at circumferential ends, the seal arc segmant further defining radially inner and outer sides, the radially outer side including radially extending sidewalls and a radially inner surface joining the radially-extending sidewalls, the radially-extending sidewalls and radially inner surface defining a pocket;
• machining the radially inner surface to have a higher surface roughness than the sidewalls;
• machining a first surface roughness at a first section of the radially inner surface;
• and
• machining a second surface roughness at a second section of the radially inner surface, wherein the first section is axially spaced from the second section, the first surface roughness is different from the second surface roughness, and the first surface roughness and the second surface roughness are greater than the surface roughness of the sidewalls.

A method of manufacturing a seal, comprising:

• providing a seal arc segment defining first and second seal supports at circumferential ends, the seal arc segment further defining radially inner and outer sides, the radially outer side including radially-extending sidewalls and a radially inner surface joining the radially-extending sidewalls, the radially-extending sidewalls and the radially inner surface defining a pocket;
• machining the radially inner surface to have a higher surface roughness than the sidewalls;
• providing a carriage defining first and second circumferentially spaced support members radially outward of the seal arc segment with respect to the seal arc segment;
• and
• suspending the seal arc segment from a carriage, the first support member supporting the first seal support in a first ramped interface and the second support member supporting the second seal support in a second ramped interface, the radially-extending sidewalls including four contiguous radially-extending sidewalls, the first seal support extending from a first of the radially-extending sidewalls, and the second seal support extending from a second of the radially extending sidewalls circumferentially opposite the first of the radially-extending sidewalls.

A method of manufacturing a seal, comprising:

• providing a seal arc segment defining first and second seal supports at circumferential ends, the seal arc segment further defining radially inner and outer sides, the radially outer side including radially-extending sidewalls and a radially inner surface joining the radially-extending sidewalls, the radially-extending sidewalls and the radially inner surface defining a pocket;
• machining the radially inner surface to have a higher surface roughness than the sidewalls;
• providing a carriage defining first and second circumferentially spaced support members radially outward of the seal arc segment with respect to the seal arc segment;
• suspending the seal arc segment from a carriage, the first support member supporting the first seal support in a first ramped interface and the second support member supporting the second seal support in a second ramped interface;
• machining channels spaced apart a first distance at a first section of the surface;
• and
• machining channels spaced apart a second distance at a second section of the radially inner surface, the first section axially spaced from the section, and the first distance different from the second distance.