Cooling ring construction for combustion chambers

Abstract

An apparatus for passing a portion of a cooling fluid, flowing in a plenum in a predetermined direction, in a protective film upon a liner defining a hot gas passage. The apparatus is comprised of a first liner portion or segment partially defining the plenum and a second liner portion or segment partially defining the hot gas passage and cooperating with the first liner segment to form a pocket. A first lip is located at the downstream end of the second liner segment and is radially adjacent a second lip located at the upstream end of the first liner segment. The first lip is spaced from the first liner segment to form an exit from the pocket for directing cooling air along the first liner segment in the predetermined direction. The apparatus further comprises a plurality of apertures in the first liner to pass cooling fluid in a plurality of streams into the pocket and along the second lip in a direction substantially opposite from said predetermined direction. The second lip may be constructed of a length sufficient to permit the plurality of streams to at least partially coalesce while passing along the second lip in the opposite direction. The fluid may be directed upon the second lip to accomplish partial diffusion of the streams. The apparatus may also comprise secondary means for additionally diffusing the cooling fluid flow within the pocket and for turning the flow of the substantially coalesced cooling fluid to the predetermined direction prior to the passing of the cooling fluid from said exit.