GAS DYNAMICS OF A RECESSED NOZZLE IN ITS DISPLACEMENT IN THE RADIAL DIRECTION

Numerical simulation of gasdynamic processes accompanying the operation of the recessed nozzle of a solidpropellant rocket motor in its linear displacement is carried out. Reynolds-averaged Navier–Stokes equations closed using the equations of a k–ε turbulence model are used for calculations. The calculations are done for different rates of fl ow of the gas in the main channel and in the over-nozzle gap, and also for different displacements of the nozzle from an axisymmetric position. The asymmetry of geometry gives rise to a complicated spatial flow pattern characterized by the presence of singular points of spreading and by substantially inhomogeneous velocity and pressure distributions. The vortex fl ow pattern resulting from the linear displacement of the nozzle from an axisymmetric position is compared with the data of experimental visualization. The change in the vortex pattern of the fl ow and in the position of the singular points as a function of the fl ow coeffi cient and the displacement of the nozzle from the symmetry axis is discussed.
   
Author:  K. N. Volkov, S. V. Denisikhin, and V. N. Emel′yanov
Keywords:  vortex structure, nozzle, injection, numerical simulation, singular point
Page:  932