Unsteady Simulations of Passive and Powered resonance tube for use in control applications. These simulations were performed as part of an ongoing study to design and develop actuation devices for the control of a turbulent weapons bay flow field.

Figure 1 shows the vorticity contours in a passive resonance tube also known as a Hartmann-Springer tube. The device consists of a Mach 0.2 flow over a triangular wedge placed in front of a resonance tube. The system radiates pressure waves generated by a coupling between the flow in the tube and the vortex shedding behind the wedge. The frequency content of the device is dominated by the first longitudinal harmonic of the resonance tube.

Figures 2 and 3 show the pressure contours from the simulations of powered resonance tubes. In these devices, a supersonic flow from a nozzle with a rod at the centerline enters a resonance pipe. The resulting flow filed is highly oscillatory in nature resulting in radiated pressure waves exceeding 175dB in amplitude.

Figure 3 simulates a situation in which a powered tube is mounted in some setting where one side is closed off by the mounting.