ABSTRACT
We have seen that under certain conditions compressible flow can undergo sudden changes in condition. In the diverging section of a C-D nozzle, for instance, this occurs when the pressure conditions are such that the nozzle cannot sustain an isentropic flow. In order to characterize such an event, we return to the analysis of a sudden disturbance in a one-dimensional flow, as in Chapter 6. In this case, however, we do not call the disturbance small—an assumption that led to the isentropic process expressed in Eq. (6.8). The effect of the disturbance is assumed to take place in an extremely short distance along the flow (instantaneously, in the limit) so that the process may be assumed to occur at constant area, as sketched in Fig. 8.1. Flow through a sudden disturbance. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203750384/367da4ff-802e-4466-ac3d-58e871f18315/content/fig8_1.tif"/>
