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Hartmann whistle refers to a device that employs a high-speed jet impinging on a cavity, which is open at one end and closed at the other. In some pieces of literature, this device is also referred to as the Powered Resonance Tube (PRT). One advantage of using this device is that it employs no moving part which in turn, makes it more reliable and safe. This device is simple to operate and consumes low power. This device is capable of producing high amplitude tones over a wide range of frequencies. The aero-acoustic field produced due to resonance in PRTs has elevated amplitudes. Thus, these strong unsteady flow fields produced by PRT can be used for active flow control applications. Another interesting aspect of this device is the resonance induced heating at the closed end of the tube. Resonant heating can result in temperatures as high as 1000°C, which could be used for fuel ignition. The intended work primarily focuses on the performance of nonuniform PRTs at different nozzle pressure ratios. In the present context, the word ‘nonuniform’ refers to variation in cross-sectional area of the PRT along its length. Higher amplitude tones can be achieved using nonuniform PRTs. In the full paper, aero-acoustic and heating effects in different nonuniform PRTs will be investigated. The results for various nonuniform PRTs will be then compared with conventional PRT (uniform resonator). The results will include, sound pressure level, the tonal quality in terms of frequency content and the temperature achieved at the closed end.
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