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Development and Application of the High Bandwidth Powered Resonance Tube

机译：高带宽谐振管的研制与应用

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The Powered Resonance Tube (PRT) actuator, which is an adaptation of the Hartmann whistle, was selected for bandwidth enhancement. The operation and near field features of this actuator were characterized both experimentally and computationally. An improved analytical theory was developed for the prediction of the frequency of actuation. The analytical frequency prediction formula overcame difficulties with the conventional quarter wavelength theory by accounting for the compliance and mass of the fluid in the integration slot in the prediction of resonance frequencies of the system, leading to improved predictions for the resonant frequency. Advances in the program included development of a control system, directivity behavior, the role of harmonics, a miniaturized version of the PRT, Helmholtz based PRTs to reduce geometric constraints, a design GUI for Helmholtz systems. A demonstration of a PRT based flow control system applied to an impinging jet flow reduced both overall sound pressure level and tonal sound and identified the reduced mass flow benefits of applying actuation at an optimized frequency.

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