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IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Progress in Nuclear Energy Pub Date : 2024-09-16 DOI:10.1016/j.pnucene.2024.105417

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引用次数: 0

摘要

液滴散热器（LDR）系统的单位质量最大传热能力可达传统热管热交换器的十倍，这对未来空间设备的使用非常有利。LDR 主要由液滴发生器、液滴层、液滴收集器、循环泵和相应的管路组成，其中液滴发生器是产生液滴层的关键设备。通过使用数值和计算流体动力学方法，建立了一个液滴流计算模型，以模拟在稀薄大气中通过高频干扰射流破裂产生液滴，而不考虑重力。该模型旨在复制液滴发生器的运行。经过验证，计算结果的误差约为 5%。分析硅油和液态金属锂的工作流体，研究在不同的射流速度、干扰频率和其他工作条件下，射流产生的液滴直径 d、液滴间距 s 和液滴均匀性等参数。此外，还要评估各种条件对结果的影响。结果表明，液滴直径 d 与表面张力和射流初速度成正比，与干扰频率成反比。液滴间距 s 和液滴多分散指数 λ 与扰动频率成反比，与射流速度成正比。提高表面张力和扰动频率可改善液滴流动的均匀性，最小液滴多分散指数可降至 1%左右。应优先考虑调整射流速度，以获得更均匀的液滴，从而确定工作流体。离开喷嘴后，射流会产生涡流，这将影响随后的液滴速度。液滴的平均速度约为未受干扰的射流速度的 80%。对射流运动特性以及液滴直径和均匀性变化规律的分析可为液滴发生器的设计提供依据。

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The Uneven characteristics and mechanism investigation of multiple jet droplets in space

The liquid droplet radiator (LDR) system can achieve a maximum heat transfer capacity of ten times that of traditional heat pipe heat exchangers per unit mass, which is very advantageous for the use of future space equipment. LDR mainly consists of a droplet generator, droplet layer, droplet collector, circulation pump, and corresponding pipelines, among which the droplet generator is the key equipment for generating the droplet layer. By using numerical and computational fluid dynamics methods, a droplet flow calculation model is developed to simulate the generation of droplets through high-frequency disturbance jet breakup in a thin atmosphere, without considering gravity. This model aims to replicate the operation of a droplet generator. After verification, the calculation result has an error of about 5%. Analyze the working fluids of silicone oil and liquid metal lithium, examining the parameters of droplet diameter d, droplet spacing s, and droplet uniformity generated by the jet under varying jet velocities, disturbance frequencies, and other working conditions. Additionally, assess the impact of each condition on the results. The results show that the diameter d of the droplet is directly proportional to the surface tension and the initial velocity of the jet, and inversely proportional to the disturbance frequency. The droplet spacing s and droplet polydispersity index λ are inversely proportional to the disturbance frequency and directly proportional to the jet velocity. The increase in surface tension and disturbance frequency can improve the uniformity of droplet flow, and the minimum droplet polydispersity index can be reduced to around 1%. Priority should be given to adjusting the jet velocity to obtain more uniform droplets to determine the working fluid. After leaving the nozzle, the jet will generate vortices, which will affect the subsequent droplet velocity. The average velocity of the droplet is about 80% of the undisturbed velocity of the jet. The analysis of jet motion characteristics and the variation patterns of droplet diameter and uniformity can provide a basis for the design of droplet generators.

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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.