Abstract
In experimental studies to investigate the generation mechanism of aerodynamic noise from various models in open-type wind tunnels, interference between the large-scale turbulence in the jet edge and the model either produces unwanted additional aerodynamic noise, or destroys the two-dimensionality of the flow around the model. Two types of end walls, acoustically reflecting and transparent, are proposed in order to avoid the flow-model interactions. First, acoustical characteristics of the two walls are compared experimentally. It is confirmed that the acoustically transparent wall gives nearly free-field sound transmission characteristics by measuring the sound fields radiated from a loudspeaker. The acoustically transparent wall also gives better result than the reflecting wall in aerodynamic noise measurement, upon comparing the coherence between the radiated sound from the model and the velocity fluctuation in the model wake.
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