Method and Apparatus for Enhanced Flameholding in Augmentors

Abstract

A jet engine flame holder bluffbody is provided that includes a leading edge that is rounded, a mid-body having a rectangular cross-section, and a trailing edge, where the trailing edge includes a rectangular cross-section having digitated cutouts from the rectangular cross-section, where the tailing edge projects upward according to a digitated cross-section, where material digits remain between consecutive pairs of the digitated cutouts.

What is claimed: 
     
         1 . A jet engine flame holder bluffbody, comprising:
 a. a leading edge, wherein said leading edge is rounded;   b. a mid-body, wherein said mid-body comprises a rectangular cross-section; and   c. a trailing edge, wherein said trailing edge comprises said rectangular cross-section having digitated cutouts from said rectangular cross-section, wherein said tailing edge projects upward according to a digitated cross-section, wherein material digits remain between consecutive pairs of said digitated cutouts.   
     
     
         2 . The jet engine flame holder bluffbody of  claim 1 , wherein said trailing edge comprises a wedge-shape along a length of said trailing edge. 
     
     
         3 . The jet engine flame holder bluffbody of  claim 1 , wherein said trailing edge comprises a block-shape along a length of said trailing edge. 
     
     
         4 . The jet engine flame holder bluffbody of  claim 3 , wherein said trailing edge comprises a rectangular recess along an upper-center portion of said solid body, wherein each said digit comprises a crenellation feature. 
     
     
         5 . The jet engine flame holder bluffbody of  claim 4 , wherein said crenellation feature comprises a cross-section shape selected from the group consisting of square, rectangular, semi-circular, partly-circular, elliptical, triangular. 
     
     
         6 . The jet engine flame holder bluffbody of  claim 4 , wherein said crenellation feature comprises a top surface selected from the group consisting of angled towards a centerline along a length of said trailing edge, angled away from a centerline along a length of said trailing edge, and rounded. 
     
     
         7 . The jet engine flame holder bluffbody of  claim 4 , wherein said crenellation feature comprises a tapered sidewall. 
     
     
         8 . The jet engine flame holder bluffbody of  claim 1 , wherein each digitated cutout comprises a cross-section shape selected from the group consisting of square, rectangular, semi-circular, partly-circular, elliptical, and triangular. 
     
     
         9 . The jet engine flame holder bluffbody of  claim 1 , wherein said material digits comprise a cross-section shape selected from the group consisting of square, rectangular, circular, semi-circular, partly-circular, elliptical, and triangular. 
     
     
         10 . The jet engine flame holder bluffbody of  claim 1 , wherein said leading edge comprises a hollow structure. 
     
     
         11 . The jet engine flame holder bluffbody of  claim 1 , wherein said mid-body comprises a hollow structure. 
     
     
         12 . The jet engine flame holder bluffbody of  claim 1 , wherein said trailing edge comprises a hollow structure. 
     
     
         13 . The jet engine flame holder bluffbody of  claim 1 , wherein said material digit comprises a triangular shape, wherein a side of said triangular shape is curved. 
     
     
         14 . The jet engine flame holder bluffbody of  claim 1 , wherein said trailing edge comprises crenellation structures and a rectangular recess having a wall thickness up to a thickness of a wall thickness of a hollow said mid-body.