Experimental Study of Supersonic Jet Characteristics of a Grooved Nozzle

In this paper, an investigation is done for supersonic jet expanding from convergent-divergent nozzle with and without grooves for three different conditions such as over expansion, optimum expansion and under expansion. A convergent-divergent(C-D) nozzle was designed for Mach number of 1.4 with exit diameter of 12 mm. Flow visualization technique was used to visualize shocks at the exit of nozzle with help of shadowgraph method. Experiments were conducted and pressure decay tests were taken for three different cases. Core length was also found with the help of pressure decay test. The changes and effects of jet mixing enhancement for nozzle with and without grooves in three different cases were studied experimentally in this project. A new type of groove geometry is introduced in the nozzle core flow and the effects of potential core length, shock cell, Mach disk were studied.