Abstract
In this paper, the shock wave propagating through the plenum chamber with Borda's mouthpiece was studied by numerical simulation. Computations were carried out by solving the two-dimensional compressible Navier-Stokes equations by using the total variation diminishing (TVD) scheme. Computations were performed for five types of the plenum chamber with Borda's mouthpiece [coaxial mouthpiece, off axis mouthpiece, oblique edge mouthpiece, no mouthpiece (coaxis, off axis)] and two incident shock Mach numbers (Ms=1.5, 2.0). The flow fields were numerically visualized by the pressure and vorticity contours, velocity vectors and sonic lines. The pressure distributions and time histories of the pressure contours in the wall and the axis of the duct were also studied, and the attenuating process of the shock front and the diminishing process of the nonuniformity of the shock front were explored.
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