Application of Sound Source Models to the Heated Subsonic Jet

ZHANG Xing-chen; YANG Hai-hua; WAN Zhen-hua; SUN De-jun

doi:10.21656/1000-0887.370526

Volume 37 Issue 12

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ZHANG Xing-chen, YANG Hai-hua, WAN Zhen-hua, SUN De-jun. Application of Sound Source Models to the Heated Subsonic Jet[J]. Applied Mathematics and Mechanics, 2016, 37(12): 1308-1323. doi: 10.21656/1000-0887.370526

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Application of Sound Source Models to the Heated Subsonic Jet

doi: 10.21656/1000-0887.370526

Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, P.R.China

Funds: National Natural Science Foundation of China(11232011；11402262；11621202)

Received Date: 2016-11-03
Rev Recd Date: 2016-11-26
Publish Date: 2016-12-15

Abstract

Abstract

The noise generation mechanisms associated with instability waves in the heated subsonic transitional jet are studied, which are compared with its cold counterpart. The spatial evolution of instability waves is obtained by solving linear parabolized stability equations (LPSE) based on the time-averaged flow field of the large eddy simulation (LES). Then, the linear and nonlinear models for jet noise are built based on the LPSE solutions, coupled with the acoustic analogy. The LPSE results show that heating increases the spatial-growth rate and leads to earlier saturation. For high-frequency components, the sound pressure levels (SPL) are raised by heating as shown in the linear model. In general, compared with that for the cold jet, the gap of SPL between the linear model and the LES is reduced for the heated jet, which indicates that the linear mechanism plays a more important role in the hot jet. For a cold subsonic jet, previous studies have shown that the nonlinear model is able to raise acoustic efficiency. Here, it is found that the gap of SPL between the nonlinear model and the LES could be further decreased in the hot jet, and the thermodynamic sound source terms play a bigger role.
- LPSE,
- instability wave,
- linear mechanism,
- nonlinear mechanism

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References(34)

References

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