To improve the reliability of pressure measurement in detonation combustor of pulse detonation engine(PDE)

the pressure/time curves of detonation were measured at single detonation and multicycle detonation

respectively

by using a dynamic pressure measurement system.The experimental study at single detonation reveals that

if the length of branch tube is less than 100mm

the peak value of detonation pressure can be measured;if the length of tube is more than 150mm

the flame cannot propagate within the branch tube

and only platform pressure after detonation could be measured.For multicycle detonation

if the length of cooling tube is short enough

the detonation pressure can be measured.The research results resolve the reliability problem of pressure measurement on multicycle detonation.