FLUIDIC OSCILLATOR AS A DYNAMIC CALIBRATION TOOL

A fluidic oscillator is proposed as an improved dynamic calibration device for pressure instrumentation such as pressure-sensitive paint (PSP). The fluidic oscillator is a device that generates an oscillating jet when supplied with a pressurized fluid. The jet oscillation frequency ranges up to 6.5 kHz, depending on supply pressure. The flowfield of the oscillating jet has higher-order frequency content of at least 40 kHz, making it ideal for high-frequency calibrations. The fluidic oscillator demonstrated in these experiments is small, simple to use, portable, and inexpensive. The fluidic oscillator calibration tool may be used to calibrate the frequency response of hot-film or hot-wire probes, as well as pressure instrumentation such as pressure transducers or pressure-sensitive paint (PSP). In this work, the fluidic oscillator is used to calibrate the response time of several PSP formulations. Pressure-sensitive paints with anodized aluminum, polymer/ceramic, and thin-layer chromatography binders are calibrated and compared to previous calibration results. Full-field measurements and pointmeasurements with PSP are presented. Typical response times of porous PSPs are on the order of 40 kHz.

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