关键词: 脉冲爆震发动机;循环;特征时间+;两相燃烧;无阀+

Abstract: Experimental investigations were conducted on a two-phase valveless pulse detonation engine to explore the cycle processes.Gasoline and air were formed combustible mixture and was ignited by a spark with low energy release subsequently.Multi-cycle detonation test showed that characteristic times of the two-phase valveless PDE mock-up at operating frequency from 10 to 66Hz are different from others.Pressure evolution in the detonation tube was detected through pressure histories at different points along detonation tube at low operating frequency, and some characteristic times of cycle processes was obtained from pressure history at thrust wall from 10~66Hz.Due to long ignition delay time and DDT time for two-phase PDE,additional filling process after spark discharge was found.There exists limit cycle duration,which is equal to the difference of entire cycle duration and the pre-ignition filling time.Also,for increasing operating frequency,the most important factors were analyzed.

Key words: Pulse detonation engine;Circulation;Characteristic times;Two-phase combustion;Valveless