Abstract
The rate of absorption of sound energy by turbulence in a box has been experimentally determined. The box is essentially a reverberant box to eliminate influence of mere scattering of sound. In the box, turbulence is stirred up by a rotating structure and the sound is generated by a loudspeaker with sinusoidal excitation. The data show that the sound absorption by turbulence in general can not exceed 1/1500 m-1. in terms of the absorption coefficient with 95 % reliability, for the present condition with the typical speed of 35 ms-1. The absorption is much less efficient than sometimes assumed, and too inefficient to have any significant influence on the jet noise characteristics.
