Expansion Waves Study

THE EFFECTS OF EXPANSION WAVES ON VORTICES AND TURBULENCE

The objective of the present research program is to preliminary explore the potentially favorable effects of expansion waves on turbulence and vortices. In the very few previous investigations of interactions of turbulence with expansion waves the effects due to stabilizing streamline curvature substantially masked the effects of turbulence suppression due to flow expansion though the waves. In the present flow configurations planar expansion waves interact with grid generated turbulence in a high resolution shock tube research facility. This approach will assess directly the effects of the interaction on turbulence. In addition, several new experiments have been designed to include interactions of expansion waves with vortices. In the present approach the following interactions are being investigated:

  1. Longitudinal vortices with expansion waves;
  2. Spanwise vortices with expansion waves;
  3. Free stream turbulence interaction with expansion waves.
  4. The fundamental fluid physics issue of the proposed investigation is the distortion of vorticity by expansion waves.