Study of Rectangular Underexpanded Microjets  

作　　者：Shota Yoshimi Shinichiro Nakao Yoshiaki Miyazato Shota Yoshimi;Shinichiro Nakao;Yoshiaki Miyazato(Department of Mechanical Systems Engineering, The University of Kitakyushu, Fukuoka, Japan)

机构地区：[1]Department of Mechanical Systems Engineering, The University of Kitakyushu, Fukuoka, Japan

出　　处：《Open Journal of Fluid Dynamics》2023年第2期122-131,共10页流体动力学（英文）

摘　　要：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.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 

分 类 号：O35[理学—流体力学]