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Experimental analysis of sound directivity from sound propagation through non-isothermal, turbulent exhaust jets in cross-flow

Experimental analysis of sound directivity from sound propagation through non-isothermal, turbulent exhaust jets in cross-flow

Orddom Yi Jie Leav, Benjamin S. Cazzolato, Carl Q. Howard (2018)

Proceedings of the Acoustic 2018, Adelaide, Australia, 6-9 November

Abstract:

The common assumption when predicting community noise levels from exhaust stacks is that the sound radiation is axisymmetric, which is appropriate for low Mach number, low temperature flows, and in the absence of cross-winds. However, this assumption is inaccurate when the conditions do not hold. This paper investigates experimentally the effects of a cooler cross-flow on the sound directivity of turbulent, heated exhaust gas from a stack. A small-scale experimental rig (1:100) has been built that reproduces the flow, temperature and acoustic conditions seen in large-scale open-cycle gas turbines. The University of Adelaide's Wind Tunnel was used to create cross-flows that resemble the cross-wind conditions observed near open-cycle gas turbines. The small-scale experimental rig and the test conditions were scaled using relevant non-dimensional fluid dynamics and acoustic parameters. Directivity measurements from the experiments have shown that the hot exhaust plume leads to an asymmetric acoustic radiation pattern from the exhaust stack. The experimental results presented in this paper shows that the presence of a hot exhaust plume and cross-flow alters sound directivity in the far-field downstream by increasing levels up to 11 dB, which has the potential to impact nearby communities.

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