Structural analysis of dynamic-controlled jet using DNS

DOI Web Site 14 References Open Access
  • TSUJIMOTO Koichi
    Division of Mechanical Engineering Graduate School of Engineering, Mie University
  • SHIBATA Noritaka
    Division of Mechanical Engineering Graduate School of Engineering, Mie University
  • SHAKOUCHI Toshihiko
    Division of Mechanical Engineering Graduate School of Engineering, Mie University
  • ANDO Toshitake
    Division of Mechanical Engineering Graduate School of Engineering, Mie University

Abstract

In order to develop a new mixing procedure, we conduct DNS (direct numerical simulation) of dynamic controlled free jets. As the dynamic control, it is assumed that the inflow of jet rotates around the streamwise axis. To realize the high accurate computation, the discretization in space is performed with hybrid scheme in which sine or cosine series and 6th order compact scheme are used. From view of instantaneous vortex structures, it is found that the flow pattern considerably changes according to the rotating frequency, i.e., according to the increasing the frequency, helical and entangled mode appear in turn. From the ensemble averaged flow properties such as half jet width and entrainment, it is confirmed that the jet widely spreads perpendicular to the rotating axis and that the mixing of upstream jet is markedly enhanced due to the dynamic control. Further in order to quantify the mixing efficiency of the dynamic control, as another mixing measure, a statistical entropy is examined. Compared to the uncontrolled jet, it is confirmed that the mixing efficiency is markedly improved, suggesting that the dynamic control can be expected to be useful for the improvement of mixing performance.

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