Droplet size effect on detonation velocity of two-phase pulse detonation engine

Although much work has been accomplished in two-phase detonation, the field is not as developed as gaseous detonations and many issues, such as the fuel injection, atomization and vaporization, the mixing of fuel and oxidizer, quick and short distance detonation initiation and so on, need to be conquered. This paper addresses the atomization processes for plain-orifice injector and twin-fluid air-assist atomizer. A particle size meter based on laser light scattering is employed to measure mean droplet size. And the relationships between droplet size and gasoline mass flux are available. The twin-fluid air assist atomizer can produce much smaller mean droplet size than plain-orifice injector. Combining the atomization data with the multi-cycle detonation data based on a gasoline-air PDE model, droplet size of gasoline has a considerable effect on the gasoline-air detonation velocity. The detonation velocity increases as the droplet size decreases. And the detonation velocity tends to increase with the detonation sequence. However, the measured velocity is much lower than the ideal C-J velocity.