Closed-Loop Control of Unstart in a Mach 1.8 Isolator

摘要

Experimentally simulated back pressure disturbances are suppliedby an oscillating mechanical flap, and control actuation is providedby fast actuating jets, both placed at the isolator exit. The control taskis to hold the shock-train location at a constant value within atolerance of one hydraulic diameter (the typical high-frequencysmall-scale unsteadiness inherent to shock trains). A closed-loopPD controller was used in conjunction with three different methodsof estimating the shock-train location based on wall pressure measurementsalong the isolator length.