Numerical investigation of the ejector influence on the effectiveness of a jet nozzle of a detonation engine

The gas flow inside an ejector under pulse-periodic impact of a detonation wave is investigated numerically. The flow behind the detonation wave that exits a long detonation tube 20 mm in diameter is used as the ejecting gas. The initial distributions of the gas velocity, the pressure, the temperature, and the density are preset inside the detonation tube. The Navier-Stokes equations are solved using the second-order Roetype finite-difference scheme. The flow rate of the ejected air and the thrust generated by the jet engine under pulsating conditions are determined. It is shown that the use of an ejector can yield thrust augmentation by 17%.