Affiliation of Author(s):能源与动力学院

Journal:Tuijin Jishu

Abstract:Unstart is an abnormal operating state for hypersonic inlets, which will bring fatal effects to the flight control and vehicle. A new control method for the hypersonic inlet unstart caused by downstream mass-flow choking based on a movable slot-plate is brought forward and investigated by wind tunnel experiments. High-speed Schlieren imaging and time-resolved pressure measurements are used simultaneously to record the unsteady flow structures and surface pressures of the controlled process. Experiment results indicated that with the help of the spillage which affords the discrepancy of the capture ability and the exhaust capability of airflow during this oscillation cycle, the control method is effective to control the oscillation caused by the unstart, whatever the movable slots placed on the cowl downstream the throat or on the ramp upstream the throat. While the slots are opened, the amplitude of the pressure oscillation will decrease gradually. The frequency of the oscillation will be retained with the slots on the cowl side, while the frequency will increase with the slots on the ramp side for the extending subsonic region in the duct. Besides, the slots placed on the ramp side can improve the restart ability of the inlet by removing the separation bubble, which comes out during the unstart process. © 2017, Editorial Department of Journal of Propulsion Technology. All right reserved.

ISSN No.:1001-4055

Translation or Not:no

Date of Publication:2017-07-01

Co-author:张启帆

Correspondence Author:Tan Huijun