Mode decomposition of flow field in T-junction with rotating impeller

被引：0
作者：
Huang K. [1 ]
Li T. [1 ]
Li A. [1 ]
Lin M. [1 ]
机构：
[1] School of Energy and Power Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 07期
关键词：
dynamic mode decomposition; mixing; numerical simulation; rotating impeller; T-junction;
D O I：
10.11949/0438-1157.20230377
中图分类号：
学科分类号：
摘要：
The dynamic mode decomposition method was used to study the pressure and vorticity fields obtained from numerical simulation of thermal mixing in a T-junction with a rotating impeller. By comparing the dynamic mode decomposition results of different blade numbers (2—4), the characteristic modes of the coherent structure of the flow field in a T-junction were obtained at a speed of 20 r/min under the condition of deflecting jet flow (MR= 0.49). The diameter ratio of the main duct to branch duct is 2. By observing the spatial structure of the characteristic modes of pressure distribution, it is found that coherent structures mainly appear in the internal region of the impeller, the spatial structure of the characteristic mode of the vorticity field is mainly distributed at the blade tip, and a small amount of strip coherent structures appear near the duct wall. The second-order to fourth-order mode frequencies of the dominant pressure field and vorticity field are equal, corresponding to the 1st, 2nd, and 3rd harmonic frequencies of the blade passing frequency. Their fifth order mode frequencies tend to be equal as the number of blades increases. In addition, when the mode frequency is doubled by the blade passing frequency, “radial interference fringes”appear near the blade. The research results can provide theoretical guidance for flow control in T-junction channels. © 2023 Chemical Industry Press. All rights reserved.
引用
收藏
页码：2848 / 2857
页数：9
相关论文
共 30 条
  • [1] Hosseini S M, Yuki K, Hashizume H., Classification of turbulent jets in a T-junction area with a 90-deg bend upstream, International Journal of Heat and Mass Transfer, 51, 9, pp. 2444-2454, (2008)
  • [2] Lin C H, Ferng Y M., Investigating thermal mixing and reverse flow characteristics in a T-junction using CFD methodology, Applied Thermal Engineering, 102, pp. 733-741, (2016)
  • [3] Miyoshi K, Utanohara Y, Kamaya M., Penetration flow into a branch pipe causing thermal fatigue at a mixing tee, Nuclear Engineering and Design, 360, (2020)
  • [4] Hekmat M H, Saharkhiz S, Izadpanah E., Investigation on the thermal mixing enhancement in a T-junction pipe, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 41, 7, (2019)
  • [5] Kuhn S, Braillard O, Niceno B, Et al., Computational study of conjugate heat transfer in T-junctions, Nuclear Engineering and Design, 240, 6, pp. 1548-1557, (2010)
  • [6] Nan Z Z, Gu M Z, Li Y R, Et al., Effects of the incident angle of branch pipe on the thermal mixing of impinging jets in T-junctions, International Journal of Heat and Mass Transfer, 185, (2022)
  • [7] Lampunio L, Duan Y, Eaton M D., The effect of inlet flow conditions upon thermal mixing and conjugate heat transfer within the wall of a T-Junction, Nuclear Engineering and Design, 385, (2021)
  • [8] Su B, Zhu Z L, Ke H B, Et al., Large eddy simulation of flow and mixing characteristics in a T-junction under inflow pulsation, Applied Thermal Engineering, 181, (2020)
  • [9] Su B, Zhu Z L, Wang X Y, Et al., Effect of temperature difference on the thermal mixing phenomenon in a T-junction under inflow pulsation, Nuclear Engineering and Design, 363, (2020)
  • [10] Zhang H, Zhang W, Li W F, Et al., Characteristics of flow, mixing and interfacial reaction in T-jet reactor, CIESC Journal, 72, 10, pp. 5064-5073, (2021)
123