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Experiment and Large-Eddy Simulation on Free Air Jets Issuing from a rectangular nozzle with Deflectors

Journal of Flow Control, Measurement & Visualization 2021年第4期9卷 73-92页

作者： Riku Ouchi Takahiro Kiwata Naoki Kajitani Hiroshi Teramoto Graduate School of Natural Science and Technology Kanazawa University Ishikawa Japan Thermal Management Systems R&D Div. DENSO CORP Aichi Japan School of Mechanical Engineering Kanazawa University Ishikawa Japan Department of Mechanical Engineering National Institute of Technology Ishikawa College Ishikawa Japan

The purpose of the present study was to establish a passive flow control method for a rectangular jet using two types of deflectors installed symmetrically inside a nozzle. This deflector in a rectangular nozzle generates the rectangular coaxial jets. The effect of the slant angle of the deflectors on the flow characteristics and the spread of the rectangular jet was investigated experimentally and by large-eddy simulation. The experiment and the numerical simulation were carried out at a Reynolds number of 9000. The rectangular jet with no deflectors generates a vortex ring from the nozzle exit. The vortex ring collapses in the downstream region and the outline of the jet changes from rectangular to diamond-shaped as a result of the axis-switching phenomenon. The rectangular jet with divergent and convergent deflectors shows particularly noticeable changes in the flow characteristics and vortical structures, as compared to the case with no deflectors. In the case of the rectangular jet with divergent deflectors (slant angle of α = 6°), minor axis spread is promoted more than major axis spread, and axis switching occurs closer to the nozzle exit than that in the case of no deflectors. The outline of the jet also changes from lateral rectangular to vertical rectangular as a result of axis switching. On the other hand, in the case of a rectangular jet with convergent deflectors (α = -6°), minor axis spread is suppressed more than major axis spread, and axis switching occurs farther from the nozzle exit than that in the case with no deflectors. The outline of the jet does not change until the downstre

关键词： Jet rectangular nozzle Deflectors Flow Control Flow Measurement Numerical Simulation LES

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Study of rectangular Underexpanded Microjets

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Open Journal of Fluid Dynamics 2023年第2期13卷 122-131页

作者： Shota Yoshimi Shinichiro Nakao Yoshiaki Miyazato Department of Mechanical Systems Engineering The University of Kitakyushu Fukuoka Japan

The underexpanded microjet emerging from a rectangular convergent nozzle with a high aspect ratio at the nozzle exit is investigated numerically using the Reynolds-averaged Navier-Stokes (RANS) simulation with the Menter’s shear stress transport (SST) k-ω turbulence model. The simulation is performed at the nozzle pressure ratio of 5.0 to produce a strong shock and it is validated by a comparison with a rainbow schlieren picture of the microjet. The three-dimensional structure of the shock-containing rectangular microjet is demonstrated using the isopycnic surface and bright-field schlieren representations.

关键词： Microjets Rainbow Schlieren RANS Simulation rectangular nozzle Shock Waves

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