Unsteady flow in a dual-bell nozzle with displacement of an extendible section from the initial to working position. (English) Zbl 1509.76054
Summary: The use of extendible nozzles in propulsion systems is one potential way to increase the nozzle expansion ratio and the specific thrust. Numerical simulation of the supersonic turbulent flow of a viscous compressible gas in a dual-bell nozzle is considered. The displacement of the extendible section of the nozzle from the initial to the working position is taken into account. Numerical calculations are based on the Reynolds-averaged Navier-Stokes equations and equations of the SST turbulence model and sliding meshes. The unsteady structure of the flow formed when the nozzle is restored to service, and the topological features of the flow and relationships between flow quantities are studied. A variation of the force applied to the nozzle walls when the reactive jet flows out is discussed.
MSC:
| 76J20 | Supersonic flows |
| 76F50 | Compressibility effects in turbulence |
| 76N06 | Compressible Navier-Stokes equations |
| 76M12 | Finite volume methods applied to problems in fluid mechanics |
Keywords:
finite volume method; SIMPLE pressure correction method; Reynolds-averaged Navier-Stokes equations; SST turbulence model; expandable nozzle; specific thrustReferences:
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