Abstract
The ignition characteristics and flame stabilization of vaporized kerosene are experimentally investigated in a direct-connected model engine. The incoming flow of Ma 2.0 is generated by an air heater at a total pressure of 0.98 MPa and a stagnation temperature of 920 K, which simulates flight conditions at a height of 17 km and flow of Ma 4.0. Vaporized China RP-3 aviation kerosene is employed as fuel in a single-side expansion combustor. The result shows that the ignition characteristics are closely related to the cavity location and configuration. Four modes of ignition are classified in this paper, and an orthogonal distribution of the mode with the injection pressure and temperature variations is studied in detail. Ignition in the downstream single cavity is more difficult than that in the upstream cavity but more easily generates an intensive flame stabilized in the cavity shear layer. The existence of an ignition threshold is responsible for this difference. Only if the injection condition exceeds the critical point can the flame be established and directly reach an intensive state. In a tandem dual cavity, the ignition mode distribution is similar to that of a single cavity under lean fuel conditions. Without a shock train in the flow field, the coupling effect of the two cavities on the ignition mode transition is not obvious.
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