Coolant supply arrangement for jet engine turbine walls

A turbo jet engine coolant flow system for an engine wall member formed of first and second wall members spaced from one another with an outwardly facing surface of one wall member being impinged on by hot fluid flow during engine operations, said coolant flow system comprising:

• a plurality of first tubular coolant channels extending substantially parallel to one another between the wall members, said first tubular coolant channels extending substantially parallel to the two wall members and being bounded on respective opposite lateral sides by said two wall members,
• a plurality of second tubular coolant channels extending substantially parallel to one another between the wall members, said second tubular coolant channels extending substantially parallel to the two wall members and being bounded on respective opposite lateral sides by said two wall members,
• a plurality of first coolant flow apertures in one of said wall members which open into corresponding ones of said first tubular coolant channels for accommodating coolant flow in a direction transverse to said first tubular coolant channels,
• a plurality of second coolant flow apertures in one of said wall members which open into corresponding ones of said second tubular coolant channels for accommodating coolant flow in a direction transverse to said second tubular coolant channels,
• and a first tube guide extending in a longitudinal direction which is transverse to said first tubular coolant channels, said first tube guide having a longitudinal slot which opens to said plurality of first coolant flow apertures by way of said longitudinal slot, said first tube guide being sealingly connected to said one of said wall members by weld seams extending at respective opposite lateral sides of the longitudinal slot,whereby said first tube guide forms a coolant header for said plurality of first tubular coolant channels,
• and a second tube guide extending in a longitudinal direction which is transverse to said second tubular coolant channels, said second tube guide having a longitudinal slot which opens to said plurality of second coolant flow aperture by way of the longitudinal slot, said second tube guide being sealingly connected to said one of said wall members by weld seams extending at respective opposite lateral sides of the longitudinal slot, whereby said second tube guide forms a coolant header for said plurality of second tubular coolant channels,
• wherein said first and second tube guides are spatially separated apart from one another,
• and wherein said first and second tube guides allow for a countercurrent in said wall member by independent supply of the coolant separately to the first and second tubular coolant channels through said first and second tube guides, respectively.