Coherent structure of flow based on denoised signals in T-junction ducts with vertical blades
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Coherent structure of flow based on denoised signals in T-junction ducts with vertical blades
- 发表刊物：
- Entropy
- 摘要：
- Abstract: The skin friction consumes some of the energy when a train is running, and the coherent structure plays an important role in the skin friction. In this paper, we focus on the coherent structure generated near the vent of a train. The intention is to investigate the effect of the vent on the generation of coherent structures. The ventilation system of a high-speed train is reasonably simplified as a T-junction duct with vertical blades. The velocity signal of the cross duct was measured in three different sections (upstream, mid-center and downstream), and then the coherent structure of the denoised signals was analyzed by continuous wavelet transform (CWT). The analysis indicates that the coherent structure frequencies become abundant and the energy peak decreases with the increase of the velocity ratio. As a result, we conclude that a higher velocity ratio is preferable to reduce the skin friction of the train. Besides, with the increase of velocity ratio, the dimensionless frequency St of the high-energy coherent structure does not change obviously and St =3.09×10-4–4.51×10-4..
Keywords: T-junction; denoise; coherent structure; continuous wavelet transform
- 合写作者：
- Jing He, Xiaoyu Wang Mei Lin
- 卷号：
- 21
- 页面范围：
- 206
- 是否译文：
- 否
- 发表时间：
- 2019-02-15