Abstract
A numerical study, using the Direct Simulation Monte Carlo (DSMC) approach, of the interaction effects between two identical sonic under-expanded nitrogen jets under rarefied conditions is reported. In this paper, the effects of the jet stagnation Knudsen number (Kns), the ratio of the stagnation-to-background pressure (Ps/Pb), and the distance between the jet orifices (L/D) were investigated for a range of these parameters. The background pressure has a very significant effect on the physics of flow. The value of L/D affects the locations of the Mach disk in both primary and secondary jets. But When Ps/Pb is relatively large (such as Ps/Pb=220) and L/D is relatively small (L/D≤6.0), the separation distance L/D has only a mild effect on the location of the Mach disk in the secondary jet. A study of the rotationaltranslational non-equilibrium showed that large deviations between the translational and rotational temperatures can be found in the secondary jet, especially in the vicinity of the orifice plate.
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