Effect of Bluff Body Attributes on Afterburner Combustion Characteristics of a Boron Solid Rocket Scramjet

Abstract

In order to improve the combustion efficiency of boron-containing primary gas in the secondary combustion chamber of a solid rocket scramjet and improve engine performance, the effects of different types of blunt bodies, number of rear blunt bodies, and distance between front and rear blunt bodies on the combustion performance of the secondary combustion chamber were analyzed through numerical calculations. Among the five different blunt bodies, the basic structure has the highest combustion efficiency and total pressure recovery coefficient. When the number of bluff bodies in the secondary combustion chamber is increased from one to three, the boron particle combustion efficiency and total combustion efficiency increase with the growth of the number of bluff bodies, but the total pressure recovery coefficient lessens. When the number of bluff bodies is set as two and the spacing between the front and rear bluff bodies is set equal to 100, 200, and 300 mm, boron particle combustion efficiency and total combustion efficiency increase with the growth of spacing between bluff bodies, but the total pressure recovery coefficient decreased.