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Thermal Analysis of Void Cavity for Heat Pipe Receiver under Microgravity

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Journal of Thermal Science 2017年第2期26卷 138-143页

作者： gui xiaohong SONG Xiange NIE Baisheng China University of Mining and Technology Beijing 100083China Beijing International Studies University Beijing 100024China

Based on theoretical analysis of PCM(Phase Change Material) solidification process, the model of improved void cavity distribution tending to high temperature region is established. Numerical results are compared with NASA(National Aeronautics and Space Administration) results. Analysis results show that the outer wall temperature, the melting ratio of PCM and the temperature gradient of PCM canister, have great difference in different void cavity distribution. The form of void distribution has a great effect on the process of phase change. Based on simulation results under the model of improved void cavity distribution, phase change heat transfer process in thermal storage container is analyzed. The main goal of the improved designing for PCM canister is to take measures in reducing the concentration distribution of void cavity by adding some foam metal into phase change material.

关键词： Heat Pipe Receiver Phase Change Void Cavity Distribution

Two-Dimensional Transient Thermal Analysis of a Phase-Change-Material Canister of a Heat-Pipe Receiver under Gravity

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Journal of Thermal Science 2010年第2期19卷 160-166页

作者： xiaohong gui Wei QU Bin LIN Xiugan YUAN Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China University of Notre Dame Notre Dame IN 46556 USA Institute of Man-Machine-Environment Engineering Beihang University Beijing 100191 China

High-temperature Phase Change Material (PCM) is used as a thermal storage medium of a heat-pipe receiver in an advanced solar dynamic *** both void cavity and natural convection considered,thermal performance of the heat-pipe receiver is numerically analyzed under *** results indicate that the PCM contained in the integrated heat pipe performs an averaging function of heat *** thermal performance of the heat-pipe receiver is stable and *** a heating cycle is stable,the temperature fluctuations both on heat-pipe wall and in PCM canister remain less than 13 K throughout a sunlight and eclipse *** utility of PCM is essentially *** maximum melting ratio of PCM is 92%.Under gravity,PCM melts more quickly with the effect of natural *** convection accelerates the process of phase *** results are compared with the experimental results *** accuracy of numerical model under gravity is *** experiment for the PCM canister on the ground can be well prepared with our numerical simulation.

关键词： Heat-pipe Receiver Phase Change Material Void Cavity Natural Convection

Thermodynamic Performances of[mmim]DMP/Methanol Absorption Refrigeration

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Journal of Thermal Science 2012年第6期21卷 557-563页

作者： Wei Chen Shiqiang Liang Yongxian Guo Keyong Cheng xiaohong gui Dawei Tang Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

In order to study the theoretical cycle characteristic of [mmim]DMP （1-methyl-3-methylimidazolium dimethyl- phosphate）/methanol absorption refrigeration, the modified UNIFAC group contribution model and the Wilson model are established through correlating the experimental vapor pressure data of [mmim]DMP/methanol at T= 280~370 K and methanol mole fraction x= 0.529-0.965. Thermodynamic performances of absorption refrigera- tion utilizing [mmim]DMP/methanol, LiBr/H20 and H20/NH3 are investigated and compared with each other under the same operating conditions. From the results, some conclusions are obtained as follows： 1） the circula- tion ratio of the [mmim]DMP/methanol absorption refrigeration is higher than that of the LiBr/H2O absorption refrigeration, but still can be acceptable and tolerable. 2） The COP of the [mmim]DMP/methanol absorption refrigeration is smaller than that of the LiBr/H2O absorption refrigeration, while it is higher than that of the H2O/NH3 absorption refrigeration under most operating conditions. 3） The [mmim]DMP/methanol absorption refrigeration are still available with high COP when the heat source temperature is too high to drive LiBr/H2O absorption refrigeration.

关键词： Modified UNIFAC model Wilson model Thermodynamic performances Absorption refrigeration

Development and Test of Combustion Chamber for Stirling Engine Heated by Natural Gas

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Journal of Thermal Science 2014年第2期23卷 196-201页

作者： LI Tie SONG Xiange gui xiaohong TANG Dawei LI Zhigang CAO Wenyu Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing International Studies University

The combustion chamber is an important component for the Stifling engine heated by natural gas. In the paper, we develop a combustion chamber for the Stifling engine which aims to generate 3-5 kWe electric power. The combustion chamber includes three main components： combustion module, heat exchange cavity and thermal head. Its feature is that the structure can divide ＂combustion＂ process and ＂heat transfer＂ process into two appar- ent individual steps and make them happen one by one. Since natural gas can mix with air fully before burning, the combustion process can be easily completed without the second wind. The flame can avoid contacting the thermal head of Stifling engine, and the temperature fields can be easily controlled. The designed combustion chamber is manufactured and its performance is tested by an experiment which includes two steps. The experi- mental result of the first step proves that the mixture of air and natural gas can be easily ignited and the flame burns stably. In the second step of experiment, the combustion heat flux can reach 20 kW, and the energy utiliza- tion efficiency of thermal head has exceeded 0.5. These test results show that the thermal performance of com- bustion chamber has reached the design goal, The designed combustion chamber can be applied to a real Stifling engine heated by natural gas which is to generate 3-5 kWe electric power.

关键词： Combustion Chamber Natural Gas Stirling Engine Designing Performance Test

Film cooling with using the decomposition of an NH_3 cooling stream as a chemical heat sink

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Chinese Science Bulletin 2012年第27期57卷 3652-3659页

作者： CHENG KeYong CHEN Wei LIANG ShiQiang GUO YongXian HUAI XiuLan gui xiaohong nstitute of Engineering Thermophysics Chinese Academy of SeiencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The inlet temperatures of gas turbines are generally increasing over time,so conventional cooling methods are likely to approach their useful *** is therefore essential to investigate novel cooling *** on the theory of heat transfer enhancement,a novel film cooling method for gas turbine blades using a chemical heat sink is *** this method,the endothermic reaction of an NH 3 cooling stream heated by the main gas stream takes place,reducing the convective heat transfer between the mainstream and the ***,film cooling effectiveness is *** test the feasibility of the proposed method,numerical simulations were conducted,using the classical flat plate with a 30 degree angled cylindrical hole(diameter,D).Film cooling effectiveness at different blowing ratios(M = 0.5,1.0,and 1.5) were computed and compared with the results of conventional cooling *** simulation results show that the proposed method can enhance film cooling effectiveness not only in the stream-wise direction,but also in the span-wise *** span-averaged film effectiveness is improved in the presence of a chemical heat sink,with the value of X/D(the ratio of downstream distance from the center of the film hole to the diameter of the film hole) increasing downstream of the film *** novel film cooling approach showed the best performance at M = 0.5.

关键词：薄膜冷却散热器 NH3 化学气膜冷却效率燃气涡轮机分解冷却方法

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基于科研实践提高大学生创新能力

实验技术与管理 2018年第2期35卷 21-25页

作者：桂小红中国矿业大学(北京)资源与安全工程学院北京100083

依托在研项目,通过对"泡沫金属基复合相变材料热性能分析"的实践过程,使本科生在大学生科研创新实践中充分利用实验室的现有科研设备,完成对泡沫金属基复合相变材料的制备,并对不同泡沫金属及孔隙数密度下复合相变材料的热性能进行分析... 详细信息

依托在研项目,通过对"泡沫金属基复合相变材料热性能分析"的实践过程,使本科生在大学生科研创新实践中充分利用实验室的现有科研设备,完成对泡沫金属基复合相变材料的制备,并对不同泡沫金属及孔隙数密度下复合相变材料的热性能进行分析。通过对钟形真空室实验台的搭建及泡沫金属/石蜡制备的实践锻炼,培养了大学生良好的科研思维、独立思考及动手实验能力,从而在实践教学和科研中提高了大学生的创新能力。

关键词：泡沫金属基复合相变材料科研实践创新能力

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微重力条件下热管吸热器瞬态热分析

中国空间科学技术 2015年第4期35卷 46-52页

作者：桂小红宋香娥中国科学院工程热物理研究所北京100190 北京第二外国语学院北京100024

基于微重力条件下的导热控制微分方程,采用焓法对热管吸热器相变材料容器进行了二维数值建模与仿真,在同时考虑空穴和相变的情况下,对微重力条件下蓄热单元相变传热进行了模拟计算,分析了空穴率对蓄热容器内部的温度场和热性能的影响,... 详细信息

基于微重力条件下的导热控制微分方程,采用焓法对热管吸热器相变材料容器进行了二维数值建模与仿真,在同时考虑空穴和相变的情况下,对微重力条件下蓄热单元相变传热进行了模拟计算,分析了空穴率对蓄热容器内部的温度场和热性能的影响,并将计算结果同美国航空航天局(NASA)方案热管吸热器蓄热单元相变传热计算结果进行了比较,验证了文中微重力条件下计算模型的合理性与准确性。研究结果表明:空穴影响着蓄热单元相变的进程,空穴的存在增加了容器内部的温度梯度,使得容器的蓄热能力降低;由于热管径向温差较小,热管壁温在相变材料熔点附近变化较小,从而在一定程度上能缓解热斑和热松脱现象。

关键词：空间太阳能发电系统热管吸热器相变材料空穴相变航天器

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论武术的文化与技术的关系

武汉体育学院学报 2013年第9期47卷 46-49页

作者：王燕柯易桂晓红中国地质大学(武汉)体育部湖北武汉430074 武汉商业服务学院体育系湖北武汉430056

中华武术是中华文化的组成部分,武术根植于中华文化,具有中华文化的同一性、普遍性;武术的基本属性是武术的技术性;中华武术之所以具有生命力并成为中华文化当然的组成部分,因其自身特有的区别于其他组成部分的基本属性是其技术性而不... 详细信息

中华武术是中华文化的组成部分,武术根植于中华文化,具有中华文化的同一性、普遍性;武术的基本属性是武术的技术性;中华武术之所以具有生命力并成为中华文化当然的组成部分,因其自身特有的区别于其他组成部分的基本属性是其技术性而不是其他。武术技术是武术的根本。技击是武术技术的特点,中华武术与其他技击"意同形不同",是技术差异,是不同技击项目存在并能传承的原因。离开中华武术的基本属性武术技术去空谈武术文化是空中楼阁,只有站在武术技术属性基础和中华武术在中华文化中的正确定位上研讨武术的文化属性才是其正确之路。

关键词：中华武术武术技术武术文化

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数智时代档案利用服务伦理风险与规避策略

兰台世界 2024年第9期 68-70,74页

作者：桂小红滨州医学院

数智技术与档案利用工作融合发展带来了很多伦理风险,通过分析其具体表象及成因溯源,从而探讨数智时代档案服务利用伦理风险与规避策略,即强调构建新型伦理规约,它所依据的一般原则及特殊原则;完善档案服务利用伦理机制,建立风险预测判... 详细信息

数智技术与档案利用工作融合发展带来了很多伦理风险,通过分析其具体表象及成因溯源,从而探讨数智时代档案服务利用伦理风险与规避策略,即强调构建新型伦理规约,它所依据的一般原则及特殊原则;完善档案服务利用伦理机制,建立风险预测判别机制;充分发挥人的主体性,并引入实证研究,最终达到档案服务利用数据治理的“善治”。

关键词：伦理风险伦理规约判别机制规避策略