Abstract
Supersonic flow over cavities has been of interest since 1960s because cavities represent the bomb bays of aircraft. The flow is transient, turbulent, and complicated. Pressure fluctuations inside the cavity can impede successful weapon release. The objective of this study is to use active and passive control methods on supersonic cavity flow numerically to decrease or eliminate pressure oscillations. Jet blowing at several locations on the front and aft walls of the cavity configuration is used as an active control method. Several techniques are used for passive control including using a cover plate to separate the flow dynamics inside and outside of the cavity, trailing edge wall modifications, such as inclination of the trailing edge, and providing curvature to the trailing edge wall. The results of active and passive control techniques are compared with the baseline case in terms of pressure fluctuations, sound pressure levels at the leading edge, trailing edge walls, and cavity floor and in terms of formation of the flow structures and the results are presented. It is observed from the results that modification of the trailing edge wall is the most effective of the control methods tested leading to up to 40 dB reductions in cavity tones.
Highlights
Supersonic flow over cavities has been a fluid dynamics phenomenon of interest since the 1960s
Jet blowing at several locations on the front and aft walls of the cavity configuration is used as an active control method
Cavities represent the models of bomb bays of aircraft; they have been crucial for aerodynamic applications
Summary
Supersonic flow over cavities has been a fluid dynamics phenomenon of interest since the 1960s. Cavities represent the models of bomb bays of aircraft; they have been crucial for aerodynamic applications. Supersonic aircraft carry the stores inside and the velocity must be decreased to subsonic zone during store separation. This leads to more time over the target leading to increased possibility of being detected by a radar. Carrying the stores outside of the aircraft is a possible solution. This increases the radar signature, as well as the aerodynamic loads and heating. It is important for supersonic aircraft to carry the stores inside and to be able to release them at supersonic speeds
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