In order to understand the detonation characteristic of propane

a series of single detonation experiments was conducted with air

oxygen and air/oxygen as oxidizer in square detonation tube.Firstly the detonation performance of propane was studied.Secondly the characteristic of deflagration to detonation transition(DDT)

spread rule of wave and flame were achieved under the condition of different equivalence ratio and degrees of nitrogen dilution.The ion-probes and pressure transducers were utilized to get the velocity and pressure in the tube

respectively.The results indicate:(1)C3H8/air mixtures could not form detonation wave

and that the DDT distance of C3H8/O2 mixtures was very short

(2)the run-up distance was minimum for stoichiometric mixture

increasing as the nitrogen dilution became richer

and(3)shock and flame have similar change trend in DDT.