DESIGN OF COMBUSTOR FOR LONG-RANGE RAM-JET ENGINE AND PERFORMANCE OF RECTANGULAR ANALOG

This report describes the design of a piloted combustor intended for a ram-jet engine of long f l igh t range. The un i t comprises a large annular basket of V-type cross section, the inner surface of which i s slotted and bent into s m a l l V-gutters. A t the t ra i l ing edge of the basket, eight V-gutters are used t o propagate the flame into the main stream. A rectangular analog of t h i s combustor was tested a t air-f l o w con-ditions corresponding t o those that might be obtained during cruise. A t these conditions, conibustion efficiencies of as much as 90 percent were calculated fo r the combustor a t l t h e design equivalence ra t io of 0.52. The performance of the unit was relatively insensitive t o mounting and flow variablesj the greatest effect on efficiency was that of the manner and location of the fue l injection. A full-scale version of t h i s combustor has been designed for a 48-inch-diameter engine