Experimental Study of a High-Frequency Fluidic Valve Fuel Injector

摘要

Fuel injectors composed of an orifice connected to a small plenum cavity were mounted on a detonation tube. These fuel injectors, termed fluidic valves, utilize their geometry and a supply pressure to deliver fuel and contain no moving parts. Behavior of these fluidic valves is characterized in order to determine their feasibility for integration with high-frequency pulsed or rotating detonation wave engines. Fuel flow is initiated just prior to ignition of the detonation tube to understand the interaction between the fluidic valves and the wave. Parametric studies have been conducted with the type of fuel injected, the orifice diameter, and the plenum cavity pressure. Results indicate that the detonation wave pressure temporarily shuts off the fluidic valve supply, but the wave products can be quickly expelled by the fresh fuel supply to allow for refueling. The interruption time of the valve scales with the injection and detonation wave pressure ratios as well as a characteristic time.