Comparison and analysis of combustion characteristics and interference effect between single burning sodium jet and the dual-jets

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-11-05 DOI:10.1016/j.pnucene.2024.105524

Cheng Peng , Chengfa Cao , Jiang Wu , Jian Deng

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引用次数: 0

Abstract

Liquid sodium can be treated as a prominent medium in many industrial fields, such as photovoltaic technology, chemical synthesis, nuclear industry, etc. However, it poses significant threats to the normal operation of related systems and facilities, and human life as well, due to its potential combustion risk, particularly when multi-leakages take place. Sodium spray combustion is the most severe one, in which spray dynamic process may intensify the heat transfer and subsequent combustion process. In this work, the applicability of the droplet break-up model is firstly confirmed using numerical simulations of liquid sodium spray by Fluent code, and the impact of spray interference on combustion kinetics is examined. The Euler-Lagrange approach, which accounts for droplet break-up, collision, and agglomeration during the spray combustion process, is used in the simulation. Three-dimensional simulations of liquid sodium spray fire are then conducted, in the light of two classical experiments all around the world. The simulated volume-mean air temperature shows an error margin of less than 4%. The thermodynamic characteristics of sodium spray fire in the situation of dual-jets is further investigated. The findings indicate that the spray interference has a greater impact on the sodium content threshold and the corresponding time at which the threshold can be achieved than temperature. When the nozzle spacing varies, the consequences of the spray interference on the droplets’ combustion change. The break-up impact outweighs the agglomeration effect when the nozzle spacing is larger, while the agglomeration effect is relatively stronger when the nozzle spacing is short. This conclusion can be appropriate under both low and high flow rate of liquid sodium. The present work can provide detailed information and mechanism on spray combustion under both single jet and dual-jets conditions, which is beneficial for the evaluation of the risk of real sodium spray fire in any closed environment.

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单燃烧钠喷射器与双喷射器燃烧特性和干扰效应的比较与分析

在许多工业领域，如光伏技术、化学合成、核工业等，液态钠都可作为一种重要介质。然而，由于其潜在的燃烧风险，尤其是在发生多次泄漏的情况下，它对相关系统和设施的正常运行以及人类生命安全构成了重大威胁。钠喷雾燃烧是最严重的一种，其喷雾动态过程可能会加剧传热和随后的燃烧过程。在这项工作中，首先利用 Fluent 代码对液态钠喷雾进行了数值模拟，证实了液滴破裂模型的适用性，并研究了喷雾干扰对燃烧动力学的影响。模拟中使用了欧拉-拉格朗日方法，该方法考虑了喷雾燃烧过程中的液滴破裂、碰撞和聚结。然后，根据世界各地的两个经典实验，对液态钠喷雾燃烧进行了三维模拟。模拟的体积-平均空气温度误差小于 4%。还进一步研究了双喷射情况下钠喷射火的热力学特性。研究结果表明，与温度相比，喷射干扰对钠含量阈值和达到阈值的相应时间的影响更大。当喷嘴间距变化时，喷雾干扰对液滴燃烧的影响也会发生变化。当喷嘴间距较大时，破裂影响大于聚结效应，而当喷嘴间距较小时，聚结效应相对较强。这一结论适用于低流量和高流量的液体钠。本研究可提供单喷射和双喷射条件下喷雾燃烧的详细信息和机理，有利于评估任何封闭环境中实际钠喷雾火灾的风险。

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.