Abstract: The fuel concentration distribution after a designed fan spray injector is investigated experimentally. The main influencing parameters are velocity of main stream V a with50~90m/s,temperature of main stream T with 283~673K,fuel pressure P fwith 0 2~0 8MPa and distance down stream from the injector x with 100~190mm. The pressure of the main stream is 1 013 3×10 5Pa.It is shown from experimental results that the fuel concentration has a fan shape longitudinal distribution, while the cross distribution of spray is similar to that of a plain orifice injector oriented normal to the stream. Furthermore, the fuel distributing range and the penetrating depth increase with the decrease of both main stream velocity and temperature, and increase with the increase of fuel pressure and the distance from the injector.

Key words: after burner, fan-shape injector, fuel concentration