Phase-locked 3D3C measurements in a bi-stable fluidic oscillator

F. Wassermann, Daniel Hecker, Bernd Jung, Michael Markl, S. Grundmann

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this work the phase-resolved internal flow of a bi-stable fluidic oscillator was measured using phase-locked 3D3C-MRV, also termed as 4D-MRV. A bi-stable fluidic oscillator converts a continuous inlet-mass flow into a jet alternating between two outlet channels and, as a consequence provides an unsteady, periodic flow. Since data acquisition of a single time step in a 3D volume can take up to several minutes, only a small portion of data is acquired per period cycle, i.e. the acquisition of the entire data set is segmented over many cycles of the periodic process. By this technique a phase-resolved velocity field is created. However, the procedure requires triggering to the periodic nature of the flow. Therefore, triggering the MR scanner precisely on each Flow cycle is one of the key issues discussed in this manuscript. A triggering system was developed, based on a piezo-element pressure transducer, providing a reliable signal despite the harsh magnetic and electro-magnetic environment inside an MR scanner. The obtained 4D-MRV data are compared to data measured using Laser- Doppler anemometry and good agreement between the results is found. Subsequently, the validated 4D-MRV data is analyzed and the fluid-mechanic features and processes inside the fluidic oscillator are investigated and described and a detailed description of the internal jet-switching mechanism is provided.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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    Wassermann, F., Hecker, D., Jung, B., Markl, M., & Grundmann, S. (2013). Phase-locked 3D3C measurements in a bi-stable fluidic oscillator. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013