Supersonic Jet Noise Prediction and Validation for a Small-scale Rocket Nozzle with Launch System

A launch system is used to vertically launch a high-speed rocket or space vehicle. During the launch event, intense acoustic load is generated from the downstream of the supersonic jet and propagated in all the directions. In this study, two types of the supersonic jet noises were investigated: 1) noise of a supersonic free jet and 2) noise of an impinging jet with a launch system. Aero-acoustic predictions were performed using numerical simulations and further validated against experimental results obtained through a small-scale model test for the supersonic free jet and impinging jet with the launch system. Moreover, various types of launch systems for noise reduction are demonstrated experimentally.