초록 ▼

A gas turbine engine combustor has a porous wall structure for directing coolant from a compressed air plenum into a combustion chamber to cool its inner surface; an outer lamina has a first hole pattern therein and an inner lamina diffusion bonded to the outer lamina has a second hole pattern offse

A gas turbine engine combustor has a porous wall structure for directing coolant from a compressed air plenum into a combustion chamber to cool its inner surface; an outer lamina has a first hole pattern therein and an inner lamina diffusion bonded to the outer lamina has a second hole pattern offset from the first hole pattern to direct air from the air plenum in cross-flow relationship across internal walls to cool the outer and inner lamina and the outer lamina has a plurality of relief notches formed part way through its depth which are responsive to thermal gradients across the porous wall structure to break the outer lamina into a plurality of separated shingles thereby to prevent excessive stress formation in the porous wall structure; the inner lamina including flow control means to maintain a regulated flow of coolant from an inlet air plenum to the combustion chamber irrespective of the number of relief notches broken during operation of the gas turbine engine.

대표청구항 ▼

In a combustor assembly adapted for disposition in an air inlet plenum of a gas turbine engine and including a porous laminated wall structure having a first lamina and a second lamina with diffusion bond means therebetween for structural integrity, at least one of said first and said second lamina

In a combustor assembly adapted for disposition in an air inlet plenum of a gas turbine engine and including a porous laminated wall structure having a first lamina and a second lamina with diffusion bond means therebetween for structural integrity, at least one of said first and said second lamina having coolant air distribution means therein in the form of relieved passage means of predetermined depth in said one lamina to permit coolant air flow between a plurality of pores in each of said first and said second lamina, said one lamina having minimum thickness at the deepest portion of said relieved passage means, the improvement comprising means on said one lamina defining a pattern of interconnecting stress relief grooves which cooperate with said relieved passage means in defining crack sections coextensive with said relief grooves and, having depth less than said minimum thickness so that thermal stress induced by a temperature gradient across said wall structure is concentrated at said crack sections to fracture said one lamina thereat into a plurality of separate shingles thereby preventing excessive stress formation in said wall structure.