Fracture resistant support structure for a hula seal in a turbine combustor and related method

Abstract

A combustion liner and cooling sleeve assembly for a turbine combustor includes a substantially cylindrical combustion liner; and a substantially cylindrical outer cooling sleeve surrounding at least an axial portion of the combustion liner; wherein the outer cooling sleeve is secured to the combustion liner by a weld at one end of the cooling sleeve at its aft end, with a predetermined radial gap therebetween, the gap determined by respective operating temperatures and thermal expansion coefficients. A method of reducing crack propensity in a substantially cylindrical combustion liner and substantially cylindrical cooling sleeve assembly where one end of said cooling sleeve is welded to the combustion liner, includes the steps of: a) determining a radial gap between the combustion liner and the outer cooling sleeve as a function of operating temperatures and thermal expansion coefficients of the liner and the cooling sleeve; b) forming the outer cooling sleeve with a diameter sufficient to provide the radial gap; c) swaging the outer end of the cooling sleeve to bring the end of the outer cooling sleeve into engagement With the combustion liner; and d) welding the outer cooling sleeve to the combustion liner.

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