System and method for actively changing an effective flow-through area of an inlet region of an aircraft engine

摘要

An active effective flow-through area control system (100) includes an upstream wall-flow perturber (15) and a downstream wall-flow perturber (20) situated in an inlet region (110) of an aircraft engine (120). The downstream wall-flow perturber is positioned downstream from the upstream wall-flow perturber. The upstream and downstream wall-flow perturbers are configured to generate and trap at least one region of separated, vortical flow in the airflow through the inlet region. A method, for actively changing an effective flow-through area of an inlet region of an aircraft engine, includes creating at least one region of separated, vortical flow in an airflow passage (114) defined by the inlet region. The method further includes trapping the region of separated, vortical flow in the airflow passage. The region of separated, vortical flow partially obstructs a main inlet airflow.