COMPUTER SIMULATION OF THE NON-STATIONARY PROCESS OF THE SUPERSONIC OVEREXPANDED JET DEVELOPMENT
DOI:
https://doi.org/10.34185/1991-7848.itmm.2023.01.045Keywords:
supersonic jet, shock waves, turbulence, Navier-Stokes equation, computer simulation.Abstract
Questions of numerical simulation of non-stationary process of the development of a supersonic overexpanded jet are considered. Unsteady Reynolds-averaged Navier-Stokes equations (URANS) of compressible flows, written in an arbitrary coordinate system, along with the Spalart-Allmaras one-equation differential turbulence model are applied. The calculations of non-stationary formation of an air cold supersonic jet during the blowing through a conical Laval nozzle (simulation of engine start-up) were made. The physical features of the shock and acoustic waves generation and propagation are discussed. In the stationary phase an overexpanded free supersonic turbulent jet is formed, which includes a Mach disc in its structure. The obtained results were compared with experimental data and calculations by other authors based on the ANSYS Fluent and FloEFD CFD tools.
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