Experimental and numerical investigations of annular freejets

In the present consideration of the structure of an axisymmetric freejet issuing from an annular orifice, for a stagnation chamber pressure-to-ambient pressure ratio of 13, the physical plane of the numerically calculated flowfield is transformed into the computational one, using more grid points in the vicinity of the orifice. Operator splitting is used for two-dimensional calculations, applying the Lax-Wendroff scheme to each operator. Laser interferometry is used for verification of freejet density computation results, while radially resolved densities are determined by means of the Abel inversion. Good agreement is obtained between experiment and calculation.