Comparison of Turbulent Jet Noise and Fluctuating Flow Field

Tornadoes emit sound at frequencies below human hearing and there is evidence that it carries information about the tornado including its formation. A current theory for the fluid mechanism responsible for the production of this sound relies on latent heat causing an amplification of turbulent sounds within the tornado. The current project aims to provide experimental evidence for this amplification by examining the impact of latent heat within a small turbulent jet. This presentation will present preliminary work measuring the fluid flow within a dry turbulent jet using particle image velocity (PIV) and hotwire anemometry. The turbulent fluctuations will be compared with the local acoustic production using a 40-microphone acoustic camera that using beamforming can isolate specific sources of noise production. This work will then extend to do comparative analysis with and without the latent heat effect.