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On-line Access: 2023-04-25

Received: 2022-06-01

Revision Accepted: 2022-09-23

Crosschecked: 2023-04-25

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Jing-feng Li


Li-min Qiu


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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.5 P.419-431


Exhaust process of cryogenic nitrogen gas from a cryogenic wind tunnel with an inclined exit

Author(s):  Jingfeng LI, Kai WANG, Chenjie GU, Limin QIU

Affiliation(s):  Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   Limin.Qiu@zju.edu.cn

Key Words:  Cryogenic gas dispersion, Cryogenic wind tunnel, Exhaust method, Hazard reduction, Inclined exit

Jingfeng LI, Kai WANG, Chenjie GU, Limin QIU. Exhaust process of cryogenic nitrogen gas from a cryogenic wind tunnel with an inclined exit[J]. Journal of Zhejiang University Science A, 2023, 24(5): 419-431.

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author="Jingfeng LI, Kai WANG, Chenjie GU, Limin QIU",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Exhaust process of cryogenic nitrogen gas from a cryogenic wind tunnel with an inclined exit
%A Jingfeng LI
%A Chenjie GU
%A Limin QIU
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 5
%P 419-431
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200289

T1 - Exhaust process of cryogenic nitrogen gas from a cryogenic wind tunnel with an inclined exit
A1 - Jingfeng LI
A1 - Kai WANG
A1 - Chenjie GU
A1 - Limin QIU
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 5
SP - 419
EP - 431
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200289

A new structural design for the vent stack with an inclined exit was proposed to reduce the settlement hazard of the cryogenic plume from a cryogenic wind tunnel; it extends the plume trajectory to increase the effective contact space and time for mixing between the plume gas and atmospheric air before the plume settles to the ground, contributing to more efficient energy consumption for heating. Reduced-scale experiments and numerical simulations of plume dispersion based on vertical and 30°- and 45°-inclined exits were conducted to study harm reduction and energy-saving potential. Analyses of the minimum temperature and minimum oxygen concentration of the plume near the ground indicate that the new exhaust design with an inclined exit clearly reduces the settlement hazard. Under windless conditions and without using a fan-ejector system, up to 15.9% of the heating energy used by the burner can be saved by adopting the new design.


结论:1.相比传统垂直排气方式,30°或45°倾斜出口的排气方式可有效降低低温羽流的沉降危害;2.以0.3 m低温风洞极端排气工况为例,采用30°或45°倾斜出口,在无风条件下可节省15.9%的加热能耗;3.采用倾斜出口排气方式可以提高排气系统的安全下限。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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