Model for the shock actuation of a wedge-shaped nozzle with allowance for detachment of the flow

The motion of the starting gasdynamic discontinuities and of the detached flow arising upon the shock actuation of a wedge-shaped nozzle is examined in the framework of the problem of the decay of an arbitrary discontinuity at a jump in the cross-sectional area of the channel. The results of the calculation are compared with experimental measurements of the spatial and time dependence of the starting discontinuities upon the shock actuation of submerged jets over a wide range of variation of the parameters governing the flow: at pressure ratios $$100 < \bar p < 1700$$ and sound velocities $$0.21 < \bar a < 2.4$$ of the issuing and immersing gases, for issuing gas species with 1.16<γ<1.67, and for various combinations of these parameters. The possibility of using this model to determine the relaxation time to an undetached supersonic flow in a wedge-shaped nozzle upon the shock actuation of slightly underexpanded and overexpanded jet flows is analyzed.

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