| 摘要 |
In a gas turbine engine an auxiliary airflow is provided to power accessories. This auxiliary airflow is obtained from a bleed aperture 7 which is constructed immediately downstream of a diffuser vane 3. This high energy air from the diffuser 1 is used as the primary airflow in an ejector 10 to draw ambient air into the auxiliary airflow to lower the temperature of the bleed air. The ejector is constructed to adjust the amount of ambient air automatically according to the energy of the bleed airflow by means of a piston actuated spike 13 mounted for sliding movement in the primary nozzle 11. The spike 13 varies the volume of flow through the primary nozzle 11 according to the pressure exerted by the airflow on the piston. <IMAGE> |
