Numerical Study on the Effect of Jet on the Operation of Powder Fuel Scramjet

Metal powder fuel ha s high energy and volume calorific value s, and it is an excellent power fuel for hypersonic aircraft in the future . However, metal powder ha s poor flow characteristics and is difficult to be effectively mixed with air when supersonic air is injected . The mixing degree of fuel and air is an important factor to the efficiency of the engine. One way to solve this problem is to introduce a jet ( t he primary jet) upstream of the powder fuel inlet to improve the mixing degree of fuel and increase the residence time. In this study, a double hole jet two dimensional scramjet combustor structure w as established, the effects of different initial jet conditions on the performance of scramjets was studied and analyzed. The results show that the introduction of the primary jet can effectively improve t he mixing degree of the powder ed fuel and air in the combustion chamber p rolong the residence time of the particles in the combustion chamber and improves the combustion efficiency of the metal powder. However, both the combustion efficiency of the metal powder fuel and engine thrust increase and then decrease when the mass flow rate of the primary jet increases.