Sound propagation through elevated, heated jets in cooler cross-flow: An experimental study

Sound propagation through hot exhaust plumes with cooler cross-winds is present in many real world systems. One particular example the sound from stacks attached to open cycle gas turbine power stations. The research presented this paper investigates a reduced-scale stack, cross-flow experiments conducted wind tunnel. Experimental measurements of flow and temperature fields provide insight into complex radiation characteristics. Results acoustic show change directivity arising inclusion plume, leading non-axisymmetric concentration downwind stack outlet. In certain conditions, plume can increase observed by up 11 dB when compared scenario an absence heated jet or cross-flow. This describes at various radial distances frequencies, temperatures, free-stream velocity. results emphasise importance taking consideration estimating levels stack.