Author(s)

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.

Microjets, Rainbow Schlieren, RANS Simulation, Rectangular Nozzle, Shock Waves

Yoshimi, S. , Nakao, S. and Miyazato, Y. (2023) Study of Rectangular Underexpanded Microjets. Open Journal of Fluid Dynamics, 13, 122-131. doi: 10.4236/ojfd.2023.132010.