DYNAMIC RESPONSE OF A MACH 2.5 AXISYM-METRIC INLET AND TURBOJET ENGINE WITH A POPPET-VALVE-CONTROLLED INLET-STABILITY BYPASS SYSTEM WHEN SUBJECTED TO INTERNAL AND EXTERNAL AIRFLOW TRANSIENTS

摘要

The throat of a Mach 2. 5 inlets that was attached to a turbojet engine was fitted with a poppet valve-controlled stability bypass system that was designed to provide a large, stable airflow range. Propulsion system response and stability bypass performance were determined for several transient airflow disturbances, both internal and external. Internal airflow disturbances included reductions in overboard bypass airflow, power lever angle, and primary-nozzle area as well as compressor stall. For reference, data are also included for a conventional, fixed exit bleed system. The poppet valves greatly increased inlet stability and had no adverse effects on propulsion system performance. Limited unstated-inlet bleed performance data are presented.