DECAY CHARACTERISTICS OF OGIVAL GROOVED SUPERSONIC NOZZLE: AN EXPERIMENTAL INVESTIGATION

This project reports an experimental investigation of jet decay characteristics experienced by grooved supersonic nozzle. The objective of the project is to optimize the jet noise and enhance the jet entrainment of the exhaust flow with the atmosphere by providing sudden expansion inside the chamber (divergent section) of the Supersonic C-D nozzle. Flow characteristics such as axial jet decay, radial jet decay at successive locations downstream and elevated core length are calculated experimentally and compared with those of a conventional C-D nozzle (Base line nozzle) under identical experimental conditions. The jet decay characteristics along the jet marked line for the grooved nozzle is to be compared to those of the conventional one. With better jet decay characteristics, it possesses shorter potential core length resulting in considerable reduction of jet noise.