HFC-125在循环区内的流动模拟与验证

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-05-11 DOI:10.1016/j.ijrefrig.2025.04.021

Qiyong Zhou, Song Lu, Hui Shi, Heping Zhang

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引用次数: 0

摘要

灭火剂颗粒吸收热量并蒸发成气体。在HFC-125注入实验的基础上，建立了HFC-125注入仿真模型。将模拟值与实验值进行比较，发现模拟的灭火剂流态与实验值吻合较好。自由流区和再循环区模拟值与实验值的误差分别在±30%和±15%以内。随着风速的增大，停留时间的模拟值与实验值近似相等。模拟的特性混合时间误差在±30%以内，修正模型计算后的误差在±10%以内。修正后的模拟特征混合系数为34.84，与实验值接近。验证了模型的可靠性。利用该模型模拟了不同阻塞类型对灭火剂流动的影响。结果表明，半圆形障碍物对灭火剂流动的影响最小，更有利于灭火在再循环区。

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Flow simulation and verification of HFC-125 in recirculation zone

The fire extinguishing agent particles absorb heat and evaporate into gas. Based on the HFC-125 injection experiment, the HFC-125 injection simulation model is established. Comparing the simulated values with the experimental values, simulated extinguishing agent flow pattern is consistent with the experiment. The errors between the simulated and experimental values of the free flow and the recirculation zone are within ±30 % and ±15 %, respectively. With the increase of wind speed, the simulated value of residence time is approximately equal to the experimental value. The error of the simulated characteristic mixing time is within ±30 %, and the error after the calculation of the modified model is within ±10 %. The corrected simulated characteristic mixing coefficient is 34.84, which is close to the experimental value. The reliability of the model is proved. The model is used to simulate the effect of different obstruction types on extinguishing agent flow. The results show that the semi-circular obstruction has the least influence on the flow of fire extinguishing agent, which is more conducive to extinguishing the fire in the recirculation zone.

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.