Abstract

The present study was conducted to quantify in a controlled manor the effect of oscillator scale and working fluid on oscillator performance. The performance parameters of interest include the oscillation frequency and oscillation spread angle. Three scale models were manufactured with model attributes identical except for scale with models at two-times and three-times a baseline scale. Four working fluids were tested including helium, ethylene, carbon dioxide, and propane to generate a range of densities and viscosities. The frequency and oscillation angle measurements were obtained using high-speed video recordings of visible schlieren imagery. Trends in frequency were observed and quantified for each oscillator scale and working gas as a function of mass flow rate. This paper shows that these values could all be non-dimensionalized with the data collapsing to a single Strouhal number between 0.015 - 0.018 depending on surface roughness, independent of the Reynolds number. This result expands on the authors’ previously published work and confirms the previous finding that reveals the geometry and fluid properties also scale and collapse.

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