Time-averaged second-order pressure and velocity measurements in a pressurized oscillating flow prime mover

Richard Paridaens (1, 2) , Smaine Kouidri (2) , Fathi Jebali Jerbi (2)

1 DynFluid - Laboratoire de Dynamique des Fluides
2 LIMSI - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur

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.

Mots clés: Time-averaged second-order velocity; LDV measurement; Oscillating flow; Streaming; Time-averaged second-order pressure

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Richard Paridaens, Smaine Kouidri, Fathi Jebali Jerbi. Time-averaged second-order pressure and velocity measurements in a pressurized oscillating flow prime mover. Journal of Mechanical Science and Technology, 2016, 30 (11), pp.4971-4978. ⟨10.1007/s12206-016-0727-z⟩. ⟨hal-02444679⟩