Abstract
Nonlinear phenomena in oscillating flow devices cause the appearance of a relatively minor secondary flow known as acoustic streaming, which is superimposed on the primary oscillating flow. Knowledge of control parameters, such as the time-averaged second-order velocity and pressure, would elucidate the non-linear phenomena responsible for this part of the decrease in the system’s energetic efficiency. This paper focuses on the characterization of a travelling wave oscillating flow engine by measuring the time-averaged secondorder pressure and velocity. Laser Doppler velocimetry technique was used to measure the time-averaged second-order velocity. As streaming is a second-order phenomenon, its measurement requires specific settings especially in a pressurized device. Difficulties in obtaining the proper settings are highlighted in this study. The experiments were performed for mean pressures varying from 10 bars to 22 bars. Non-linear effect does not constantly increase with pressure.
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Richard Paridaens is an Engineer of Ecole Nationale d’Arts et Métiers (France) and a Ph.D. in Fluid Mechanics of Paris VI University. His primary research focuses on energy dissipation in energy conversion devices especially in thermoacoustic engine and turbomachinery. His research topic leads him to work in partnership with many large industrial groups.
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Paridaens, R., Kouidri, S. & Jerbi, F.J. Time-averaged second-order pressure and velocity measurements in a pressurized oscillating flow prime mover. J Mech Sci Technol 30, 4971–4978 (2016). https://doi.org/10.1007/s12206-016-0727-z
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DOI: https://doi.org/10.1007/s12206-016-0727-z