亚声速旋拧射流噪声中的温度效应

doi:10.7527/S1000-6893.2016.0100

Abstract

Abstract:

Large eddy simulation (LES) is performed for investigating temperature effects in subsonic swirling jets. The effects on the flow development and far-field noise are discussed in detail. The results of linear stability theory show that the growth rates of the shear layers are raised as the core temperature increases; the LES results show that heating promotes the interactions of large-scale structures, makes the flows develop into turbulence more quickly and shortens jet potential cores. At the laminar stage, heating raises the peak of axial velocities fluctuations in center lines; however, it has negligible influence on the peak values in shear layers. At the turbulent stage, as the core temperature increases, the levels of velocity fluctuations become lower and the decay rates become higher. Additionally, it is found that the density fluctuations in non-isothermal jets are much higher than those in isothermal jets. At polar angles near 30°, the overall sound pressure level of the hot jet is lower than that in the isothermal jet and higher than that in the cold jet. However, when polar angle is larger than 50°, heating reduces the sound pressure level and the reduction becomes much larger as polar angle increases. While, the sound pressure level increases slightly in the cold jet.

Key words: swirling jet, large eddy simulation, temperature effect, noise, coherent structure

CLC Number:

V211.3

YANG Haihua, ZHOU Lin, WAN Zhenhua, SUN Dejun. Temperature effects on noise in subsonic swirling jets[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(8): 2436-2444.

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Temperature effects on noise in subsonic swirling jets

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