Large Eddy Simulation of Flow and Mixing Characteristics in a T- junction under Inflow Pulsation
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Large Eddy Simulation of Flow and Mixing Characteristics in a T- junction under Inflow Pulsation
- 发表刊物：
- Applied Thermal Engineering
- 摘要：
- 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
- 合写作者：
- Bo Su, Ziliang Zhu, Hanbing Ke, Qiuwang Wang, Mei Lin
- 页面范围：
- ATE115924
- 是否译文：
- 否
- 发表时间：
- 2020-09-04