Turbulence statistics of turbulent boundary layer flow following injection of drag-reducing surfactant solution etc15 Tracking Number 33Presentation: Session: Control 1 Room: Room D Session start: 10:30 Tue 25 Aug 2015 Shinji Tamano tamano.shinji@nitech.ac.jp Affifliation: Nagoya Institute of Technology Jun Ito cju16507@stn.nitech.ac.jp Affifliation: Nagoya Institute of Technology Hiroki Uchikawa cke16515@stn.nitech.ac.jp Affifliation: Nagoya Institute of Technology Yohei Morinishi morinishi.yohei@nitech.ac.jp Affifliation: Nagoya Institute of Technology Topics: - Control of turbulent flows, - Turbulence in multiphase and non-Newtonian flows, - Wall bounded flows Abstract: To investigate streamwise variations of turbulence statistics in the wide range of the drag reduction ratio for the zero-pressure-gradient turbulent boundary layer flow due to the injection of drag-reducing nonionic surfactant solutions, we performed the laser-Doppler velocimetry (LDV) measurement at a new experimental apparatus with the larger size than previous one. The drag reduction ratio up to 76% could be obtained, at which the mean velocity in wall-units was beyond the Virk's ultimate for polymer solutions. |