Fuel injector for injecting fuel into a supersonic air stream

摘要

A scramjet fuel injector of the type mounted flush to the wall of a combustor through which air flows is provided. The injector includes a generally elongated body including a surface substantially flush with the wall, the surface having a proximate end and a distal end, the proximate end encountering air into which the fuel is to be injected before the distal end. The fuel injector further includes at least one fuel inlet port connected to the body, at least one fuel exit port in the surface substantially flush with the wall, and at least one throat internal to the body through which fuel serially passes after passing through the inlet ports and before passing through the exit ports. This arrangement of the fuel exit ports and throats combine to create and maintain a substantially streamlined supersonic fuel jet plume shape having exit pressure locally matched with the flowing air.