Abstract
Spray characteristics of hypergolic propellant injected by impingement nozzles have been investigated under combusting conditions, in order to clarify the difference of the atomization characteristics between non-reactive and reactive liquid. The atomization process was visualized by a laser sheet and a high-speed camera, and the droplet size distributions were calculated from the scattering intensity. Compared with non-reactive flow, the atomization process of reactive flow is accelerated by the immediate ignition of the hypergolic propellant. The mean droplet diameter of reacting flow is much smaller than that of non-reacting flow. The variation of the mean droplet diameter can be approximated to a function of Weber number based on the linear stability theory, although the empirical coefficients are significantly different.
