STUDY OF ULTRASONIC PROPAGATION THROUGH VORTICES FOR ACOUSTIC MONITORING OF HIGH-TEMPERATURE AND TURBULENT FLUID - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2016

STUDY OF ULTRASONIC PROPAGATION THROUGH VORTICES FOR ACOUSTIC MONITORING OF HIGH-TEMPERATURE AND TURBULENT FLUID

Nicolas Massacret
  • Fonction : Auteur
Marie-Aude Ploix
Jean-Philippe Jeannot
  • Fonction : Auteur
Naïm Chaouch
  • Fonction : Auteur

Résumé

Ultrasonic monitoring in high temperature fluids with turbulences requires the knowledge of wave propagation in such media and the development of simulation tools. Applications could be the monitoring of sodium-cooled fast reactors. The objectives are mainly acoustic telemetry and thermometry, which involve the propagation of ultrasounds in turbulent and heated sodium flows. We developed a ray-tracing model to simulate the wave propagation and to determine wave deviations and delays due to an inhomogeneous medium. In previous work we demonstrated the sensitivity of ultrasounds to temperature gradients in liquid sodium. To complete that study, we need to investigate the sensitivity of ultrasounds to vortices created in a moving fluid. We designed a specific experimental setup called IKHAR (Instabilities of Kelvin-Helmholtz for Acoustic Research) in order to assess the validity of the ray-tracing model and the potential of ultrasounds for monitoring such fluid. In this experiment, Von Karman instabilities were created in a flow of water. Fluid temperature was homogeneous in our experimental setup. Through a careful choice of the parameters, periodic vortices were generated. The experiment was also simulated using Comsol ® to allow discussion about repeatability. The throughtransmission method was used to measure wave delays due to the vortices. Arrays of transducers were used to measure time of flight variations of several nanoseconds with a high spatial resolution. Results were similar to simulation results. They demonstrate that beam delays due to vortices can be measured and confirm the potential of ultrasounds in monitoring very inhomogeneous fluid media such as liquid sodium used as coolant fluid in nuclear fast reactors.
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Dates et versions

hal-03150737 , version 1 (24-02-2021)

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  • HAL Id : hal-03150737 , version 1

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Nicolas Massacret, J. Moysan, Marie-Aude Ploix, Jean-Philippe Jeannot, Naïm Chaouch. STUDY OF ULTRASONIC PROPAGATION THROUGH VORTICES FOR ACOUSTIC MONITORING OF HIGH-TEMPERATURE AND TURBULENT FLUID. WCNDT 2016, Jun 2016, Munich, Germany. ⟨hal-03150737⟩
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