Finite element modelling of dynamic nozzle starting

Computational results of modelling the impulsive starting process of a nozzle are presented and compared to experimental data. The results present the passage of a shock wave from a shock tube, through the throat and into the expansion area. In addition, a wave is reflected back upstream by the convergent contour of the nozzle. The fluid is modelled as an inviscid isentropic perfect gas. The equations of motion in terms of primitive variables have been integrated and the shock wave position compares quite well with the experimental data over the duration of the starting process studied.