Dynamic response analysis and wall thickness optimization of detonation combustor under actual detonation loading

According to a detonation combustor with 60 mm inner diameter, the finite element model was built, and the actual detonation loading obtained by experiments was loaded. The influences of different factors on equivalent stress of detonation combustor were calculated under multi-cycle working condition, and the optimization of the detonation combustor wall with constant thickness was completed. It is found that the peak equivalent stress at rear section is 20 MPa higher than that at head section on average. The temperature has a significant effect on the equivalent strain of detonation combustor, and the maximum equivalent strain at 30 Hz is increased by 51.2% if the temperature is considered. Compared with the material and temperature, the wall thickness of detonation combustor has great influence on the equivalent stress. Under the room temperature and wall thickness of 0.95 mm, the maximum equivalent strain reaches 200 MPa, almost reaching the yield limit (205 MPa) of the material. The calculation results by replacing the model material show that materials with the characteristics of higher yield limit, modulus of elasticity and lower density can reduce the equivalent stress of detonation combustor.