Unsteady transverse injection of kerosene into a supersonic flow

A shadowgraph and a new fuel injection system were used to study kerosene t ransversely injected into a supersonic flow. High pressure and velocity of injection can be attained. The pressure time histories were detected in oil -line and the shadowgraphs of the flow field were obtained at different tim e-delays. The inflow stagnation pressure was varied to change the local flo w speed in test section. The results indicate that kerosene jet exhibits de ep penetration and four regimes appear clearly during the fuel jet atomizat ion in a high-speed flow. The jet disintegration is caused by surface waves propagating along the jet surface, and the breakup point is located at the wave trough. The surface waves are dominantly generated by aerodynamic for ce. The jet shock is close to windward surface of the jet. The shock reflec ts on and transmits in duct boundary layers. In the case of unsteady inject ion, the shock structure is very complicated and different from that of hyd rogen injection. The results of kerosene injected into a quiescent gas and a subsonic flow are also provided for comparison.