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课题组1篇论文被国际权威期刊“Applied Thermal Engineering”录用

发布时间：2020-09-08

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内容：

Large Eddy Simulation of Flow and Mixing Characteristics in a T- junction under Inflow Pulsation

Bo Su, Ziliang Zhu, Hanbing Ke, Qiuwang Wang, Mei Lin

Please cite this article as: B. Su, Z. Zhu, H. Ke, Q. Wang, M. Lin, Large Eddy Simulation of Flow and Mixing

Characteristics in a T- junction under Inflow Pulsation, Applied Thermal Engineering (2020),DOI：

Abstract

Large eddy simulation is performed to investigate the mixing characteristics between the hot

and cold fluids in a T-junction with different amplitudes and periods of inlet velocity. The

distributions of temperature field and velocity field as well as the properties of vortex structures are

focused in the present study. In addition, the wavelet power spectrum density (WPSD) of both

temperature and velocity fluctuations are investigated by wavelet transforms. The results show that

the instantaneous temperature and velocity in the mixing area vary periodically, while the variation

period is the same as that of inlet velocity. A typical phenomenon is observed near the moment of

lowest inlet velocity, the backflow occurs near the upstream of the opposite wall of the jet entrance.

Moreover, the WPSD results show that both mixing velocity and temperature fluctuations have the

identical prominent frequency which is equal to that of inlet velocity. The period of inlet velocity

has a large effect on the WPSDs of velocity and temperature fluctuations in the low frequency region,

while does the amplitude of inlet velocity in the high frequency region. In addition, the effect of

either period or amplitude on velocity fluctuations is not synchronized with that of temperature

fluctuations.

Key words: Inflow pulsation; T-junction; Large eddy method; Mixing characteristics; Wavelet Transform