Numerical analysis of interaction of supersonic free jets, including formation of reverse flow
Abstract
A numerical analysis of the interaction of free supersonic jets from square sonic orifices is carried out using the three-dimensional Euler equation to describe the overall flow field. Numerical simulations are presented for free jet from single orifice, two orifices, and four orifices. It is shown that, in case of two orifices, impingement of supersonic jets from the orifices yields almost plane oblique shock waves; compressed and heated gas behind these shock waves results in a powerful secondary jet which merges with the primary jets. In the case of free jets from four orifices, the shock angle of the oblique shock waves of the secondary jet as about twice of that of the free jets from two orifices. Consequently, strong convergence of the slip flow that surrounds the secondary jet takes place, yielding a concave Mach disk. The amount of entropy production due to the oblique shock wave is enough to cause a reverse flow behind the Mach disk.
- Publication:
-
Nagoya University School Engineering Memoirs
- Pub Date:
- 1992
- Bibcode:
- 1992NUSEM..44..267S
- Keywords:
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- Computational Fluid Dynamics;
- Free Jets;
- Numerical Analysis;
- Supersonic Jet Flow;
- Orifice Flow;
- Partial Differential Equations;
- Stagnation Pressure;
- Fluid Mechanics and Heat Transfer