回流型脉冲爆震燃烧室结构动态响应实验研究

Pulse detonation combustor is the core component of pulse detonation engine （PDE）. Under high temperature and periodic high-speed moving transient high-pressure load， the strength and safety of the PDE combustor is the premise of its engineering application. In this paper， a rig test platform of a novel reverse flow PDE combustor was established for pressure， temperature， and dynamic strain measurement. Preliminary test at 5 Hz were carried out and aerodynamic/thermal load and structural dynamic response were measured and analysed. The results indicate that the detonation combustor space contained a complete initiation process and pressure back propagation， of which the spatiotemporal pressure variation was more complex than the ideal model of detonation waves propagation. The PDE combustor exhibited the transient response caused by high-speed impact of detonation pressure load， while bending moments induced by pressure propagated within the reverse structure， generating low-frequency bending vibration of the combustor structure. The low-frequency components of the detonation chamber contain 50 Hz， 173 Hz and 224 Hz with the amplitude dispersion is small， while the high-frequency components are mainly distributed in 10~30 kHz with the amplitude dispersion is large.