Modeling and Simulation of Cavitation Noise of Supercavitating Vehicle

Supercavitating vehicle is a high speed object navigating in supercavitating state underwater, such as supercavitating torpedo, supercavitating projectile, etc. Cavitation noise is an important feature of underwater supercavitating vehicle, which is of great significance to its detection and stealth. Bubble cluster generate in the caudal closed area of supercavity around the vehicle. The cavitation noise source is the breakdown of the small bubble cluster. This paper firstly established cavitation noise model of single bubble, and further established cavitation noise model of bubble cluster with Rayleigh distribution radius. Based on this, the waveform and frequency spectrum of the cavitation noise of bubble cluster are simulated and analyzed in the conditions of different bubble radius, cavitation number, environment parameters, etc. The simulation results show that the cavitation noise of supercavitating vehicle is a kind of wide-band radiation noise of "bell shaped" spectrum with a strong middle frequency, and a gradual weakening low frequency and high frequency.