Integrated design of homogeneous mixing and heating of flow based on dual-throat Ludwieg tube wind tunnel settling chamber

Guoliang RONG; Yifan YANG; Chuangchuang LI; Zhiyuan LI; Xueliang LI; Jiaquan ZHAO; Jie WU

doi:10.7527/S1000-6893.2024.30906

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2025 , Vol. 46 >Issue 9: 130906 - 130906

DOI: https://doi.org/10.7527/S1000-6893.2024.30906

Fluid Mechanics and Flight Mechanics

Integrated design of homogeneous mixing and heating of flow based on dual-throat Ludwieg tube wind tunnel settling chamber

Guoliang RONG ,
Yifan YANG ,
Chuangchuang LI ,
Zhiyuan LI ,
Xueliang LI ,
Jiaquan ZHAO ,
Jie WU

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^1.School of Aerospace Engineering，Huazhong University of Science and Technology，Wuhan 430074，China
^2.Department of Engineering，University of Bristol，Bristol BS8 1QU，UK

E-mail： jiewu@hust.edu.cn

Received date: 2024-07-04

Revised date: 2024-07-24

Accepted date: 2024-08-19

Online published: 2024-08-26

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Abstract

The dual-throat Ludwieg tube wind tunnel can effectively eliminate the disturbances caused by the opening process of the fast-acting valve， but will significantly reduce the effective running time of wind tunnel. Additionally， due to the limitations of the material of the fast-acting valve， it is difficult to further increase the heating temperature of the storage section of the Ludwieg tube wind tunnel. To solve this problem， this paper proposes a novel design for the dual-throat Ludwieg tube wind tunnel by placing the annular heater in the settling chamber to achieve an integrated design of homogeneous mixing and heating of flow. Firstly， unsteady numerical simulation is used to verify the feasibility of the dual-throat Ludwieg wind tunnel with the new layout. Then， the start-up characteristics of the wind tunnel is analyzed， and the variation of Mach number and pressure at different stations during the running of the wind tunnel is quantitatively studied. Finally， the effect of the heater on the running process of the tunnel is explored. The results show that the effective operating time of dual-throat Ludwieg tube wind tunnel with a heater in the settling chamber is up to 80 ms， an increase of 23% compared to that of the traditional dual-throat layout. Additionally， when the heater temperature is increased from 434 K to 1 234 K， the maximum deviation of Mach number in the core region at the exit of the second nozzle can be decreased by 0.21%， the root mean square deviation can be decreased by 0.005， and the stagnation temperature can be increased by nearly 270 K， and the testing capability of the wind tunnel is enhanced effectively.

Key words： hypersonic wind tunnel; Ludwieg tube wind tunnel; dual-throat layout; settling chamber heating; effective operating time

Cite this article

Guoliang RONG , Yifan YANG , Chuangchuang LI , Zhiyuan LI , Xueliang LI , Jiaquan ZHAO , Jie WU . Integrated design of homogeneous mixing and heating of flow based on dual-throat Ludwieg tube wind tunnel settling chamber[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(9) : 130906 -130906 . DOI: 10.7527/S1000-6893.2024.30906

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