Aus- und Eintrittsstösse an Schaufelgittern

Summary

Though the flow in the cylindrical surface of turbines or compressors may be treated as flow in a plane by development of the cylinder into a plane, the double connection once around the cylinder introduces difficulties in the law of forbidden signals for supersonic flow with a subsonic axial component. In cases of large gaps between the stages and blades of zero thickness and straight exit and entry zones, the methods of steady one-dimensional flow can shed light on the adaptability of the flow to the transient conditions by means of special kinds of shock polars for the exit and entry flow at given blade anglesβ (Figures 7 and 8). The shocks may sometimes be a combination ofHugoniot's discontinuities andCarnot's transient zones, but are in all cases governed by mass, impulse and energy balances with an increase in entropy.