Fuel injector for a ramjet working at high Mach number

摘要

The fuel injector for delivering fuel to a combustion chamber in a ramjet engine on an aircraft designed to operate at a high Mach level (e. g. Mach 2 - 15) has a bow which receives the fuel flow and a row of injection orifices. The bow is formed, at least adjacent to its leading edge (11A), from a thin panel (11) of a thermally conducting material, e.g. stainless steel or copper, folded at an angle of about 15 degrees and having a leading edge radius of up to 2 mm. Inside the panel (11) the injector has a sealed chamber containing injectors (27) for a coolant fluid under pressure, and a system (28, 29, 30) for removing the coolant fluid after it has impacted against the concave face of the panel. The conductivity of the panel is of the order of 70 W/m/K, and the coolant fluid is a low-temperature gas or fuel.