Performance of an Isolator Fed with Parallel Flow

This paper presents the results of static pressure rise and total pressure loss across an isolator run by Mach 1.6, 1.8 and 2.0 Laval nozzles. A series of oblique shocks, termed as shock-train has been established in the isolator for many combinations of parameters. The isolator performance was studied by simulating the back pressure variation by means of a geometrical blockage at its exit. The static pressure rise and pressure loss across the isolator depend strongly on the nozzle NPR and isolator back pressure. The best performance of the isolator was for Mach 2.0 flow at NPR 7, resulting in a pressure rise of 26% across the shock-train with a pressure loss of 44%.