Characteristics of Jet-Mixing at Supercritical Pressure: Effects of Recess Length and Post Height

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  • MUTO Daiki
    Department of Mechanical and Control Engineering, Kyushu Institute of Technology
  • TERASHIMA Hiroshi
    Faculty of Engineering, Hokkaido University
  • TSUBOI Nobuyuki
    Department of Mechanical and Control Engineering, Kyushu Institute of Technology

Abstract

<p>Effects of injector geometries on cryogenic co-flowing planar jets under a supercritical pressure are numerically investigated. The present study covers a wide range of injector exit geometries which focuses post lip height and recess length, and evaluates these effects on mixing characteristics. A hybrid ILES/RANS methodology is applied to simulate wall-bounded injector regions. The results show that thicker post lips generate larger vortices behind the post lip, resulting the comb-like structure of the rolled-up inner dense jet. As a result, the mixing is well improved, and the inner jet potential core is shortened. The recessed injectors additionally induce a large-scale flapping motion of the inner jet and further enhance the mixing. The frequency analysis with velocity fluctuations demonstrates that the vortex shedding behind the post lip has a frequency which depends on the post lip height. The recessed injectors induce another low-frequency peak of the flapping motion, and which value is independent of the post lip height.</p>

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