Task 1.1 Sound absorption mechanisms in MPPs with grazing flow and under hot conditions
This is a largely experimental task. It will consider several designs of Sontech plates mounted in ducts and examine how the plate properties (surface texture, orientation of the orifices) and the flow properties (speed and direction relative to the plate) affect the sound absorption. Various measurement techniques will be used: PIV and hot-wire anemometry to measure the flow field, and multiple-microphone measurements to measure the acoustic field. The task will build on the work by Kabral et al (2014). For the high-temperature studies, gradients in the transverse direction will be monitored and their influence on the acoustic properties assessed.