Thrust augmentor heat shield

Abstract

A thrust augmentor heat shield for enclosing radially extending fuel pipes which can be attached to and removed from the outer duct wall from within the augmentor. The heat shield includes a hollow, elongate housing extending substantially entirely along the length of the fuel pipe, a nose projecting forwardly from the housing and received within a slot formed in the duct wall and a bolt for clamping the housing to the duct wall and urging the nose of the housing into the slot. The housing includes an opening between the outer duct wall and the diffuser wall for conveying cooling air radially inwardly along the housing, and openings along lateral sides of the housing in registry with the fuel discharge ports of the fuel tube. The housing includes a diffuser flowpath segment such that, when the housings are arranged in a spoke pattern, the segments form a continuous annular wall joined by splined connections. In an alternate embodiment, the outer duct wall includes a strut which extends from the duct wall to the diffuser wall and the housing is connected to it by a bolt and nose connection. With other embodiments, the housing connection includes a wedge-shaped cam mounted on the diffuser wall which jams against a correspondingly-shaped flared upper end of the housing. Another embodiment includes a collar contiguous with the diffuser wall and extended shank shoulder bolts for installation from inside the augmentor through the collar.