Examining Passive Flow Control Devices with High Speed Shadowgraph Images around a Mach 1.5 Cavity Flow Field (Postprint).

摘要

An examination of a rectangular cavity with an L/D of 5.67 was tested at Mach 1.5 with a corresponding Reynolds number of 2.3x106/ft. High speed shadowgraph movies were simultaneously sampled with dynamic pressure sensors at 75 kHz. Fourier analysis was performed on the high speed movies as well as the dynamic pressure data, which resulted in determining the locations of dominant cavity frequencies in the flow field. Four passive flow control devices were tested, two of which have historically preformed well, while two neither reduced the main acoustic tones nor reduced the broadband levels. From the high speed shadowgraph movies, observations are made in the changes in the cavity flow physics when the passive flow control devices are used, and will be discussed.