![]() The results show that the cancelation between the s ′ and u x ′, and between the s ′ and u r ′, vary with temperature ratio, and, thus, may affect the radiation directionality. ![]() The ray-tracing method is applied to locate the acoustically correlated regions, and the two-point correlation is employed to analyze the acoustic correlation. Turbulence signals in the jet flows are rearranged according to the acoustic analogies, such as the streamwise and radial shear signals, u x ′ and u r ′, the self-signal, u i ′ u j ′, the entropy fluctuation, s ′, and the vortex norm, | ω |. The sound radiation mechanism is investigated in non-isothermal subsonic jets at acoustic Mach number 0.9 and at temperature ratios of 0.86, 1.0, and 2.7, using causality methods on the results predicted by large eddy simulations.
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