Measurements of the High Frequency Noise Produced by Cavitating Projectiles in the High Speed Water Tunnel

The High Speed Water Tunnel is operated by the California Institute of Technology under Contract OEMsr-207 and is sponsored by Division 6, Section 6.1 of the NDRC of the OSRD. The experiments reported in this memorandum were requested by the office of the Chief of Section 6.1. The report presents the results of preliminary measurements of the sound produced in the 20 to 100 kilocycle frequency range by cavitating projectiles in the Water Tunnel working section. Measurements were made of the noise intensity in the 20-100 kilocycle frequency band with three different projectiles. Measurements of the intensity and distribution of the noise within this band were made with one of these projectiles