Based on 9 species and 19-step reaction

without consideration of the effect of viscosity

heat transmission and diffusion on flow

mixtures of hydrogen and oxygen were used to simulate rotating detonation engine flow field to research the effect of axial length on engine performance.Research show that:within a certain range

axial length has little influence on specific impulse of engine

but if axial length is too long

it will decrease specific impulse of engine;axial length has great influence on detonation pressure and temperature;if axial length is too little

the pressure of detonation wave is not high;if axial length is too long

the oblique detonation may decay;with the increase of axial length

the pressure of outlet continues to decrease owing to expansion;when axial length is 200mm

the average speed and specific impulse of engine reach the maximum value;azimuthal velocity decreases obviously cuttingdown the harmful influence on engine;the maximum thrust density decreases gradually;density difference in before and after shock wave decreases gradually

so that the thrust eccentricity could continue to decrease

thus effectively reducing angle scatter harmful influence.