Analysis of hot-wire anemometry data in an acoustically excited turbulent flow field

This paper describes measurements undertaken on an isothermal facility to study the effects of acoustic excitation on the flow field issuing from gas turbine style fuel injectors. The highly swirling and turbulent flow field is excited with plane acoustic waves generated by loudspeakers. Emphasis is placed on the accuracy of the measured response, over the range of excitation frequencies (50–1,500 Hz), and its possible contamination by the background turbulence. Simulated data are used to assess the experimental accuracy and the established errors, using this technique, are compared with an example set of results.