In order to investigate the effect of annular jet inlet deflector angle on initiating detonation by shock wave focusing in a twostage pulse detonation engine

initiating detonation with different deflector angles were simulated with H2/O2/N2 mixture. Cold experimental was also carried out on the effect of deflector angle on initiating detonation by shock wave focusing. The results indicate that

as deflector angle increases

the jet collision temperature and jet collison pressure is higher

the jet collision time is earlier and initiating detonation is easier

but the shock wave focusing time remains unchanged when the deflector angle is bigger than 11°. And as deflector angle increases

airflow oscillating frequency in the concave cavity increases and dynamic pressure amplitude at the bottom of the cavity decreases.