Numerical analysis of turbulent sonic jets from two-dimensional convergent nozzles |
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| Authors: | Hideo Kashimura Yuya Masuda Yoshiaki Miyazato Kazuyasu Matsuo |
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| Affiliation: | [1]Department of Control and Information Systems Engineering, Kitakyushu National College of Technology, 5-20-1,Shii, Kokuraminami-ku, Kitakyushu, Fukuoka, 802-0985, JAPAN [2]Department of Mechanical Systems Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu-ku, Kita-kyushu, Fukuoka, 808-0135, JAPAN |
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| Abstract: | The numerical analysis of a turbulent sonic jet from a two-dimensional convergent nozzle has been carried out using the compressible k-ɛ turbulence model and TVD finite difference scheme. Numerical conditions have been varied over a range of operating pressure ratios from 1.893 to 6.0 which cover the jet flow conditions from correctly expanded to underexpanded. Numerical flow visualization of sonic jet structure using the computer schlieren, a relation between shock cell length in the jet with the operating pressure ratio and the pressure distribution along jet centerline are obtained. Also, a transition process of a two-dimensional sonic jet from correctly expanded to underexpanded conditions is shown in detail and a flow model of jet structure is proposed. |
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