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Thermal and Structural Insight into Lightweight Lattice Channels for active cooling Technology

Journal of Thermal Science 2023年第3期32卷 1049-1062页

作者： YANG Zenan LUO Xiaobo CHEN Wei JU Yinchao ZHANG Bo School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China Beijing Power Machinery Institute Beijing 100074China

The active cooling technology that can reduce the combustor temperature is commonly used to protect the *** order to further improve the performance of active cooling,the structural weight reduction,cooling efficiency and stress level of the cooling channel must be considered *** this paper,new types of lattice channels for active cooling were designed and compared with the conventional cooling channel in terms of weight reduction,thermal and structural *** results showed that,at the same channel height,the cooling channel with staggered lattice arrays has the optimal comprehensive performance:the weight reduction effect reaches 39.93%;the wall temperature drops significantly,and the maximum Nu number is 2.155times of the conventional *** flow field analysis showed that horseshoe vortices formed by the impact effect and hairpin vortices near the trailing edge are the main factors of heat transfer *** disturbed boundary layer and the excited turbulent kinetic energy also contribute much to enhance the heat *** addition,due to the HTE-induced increment of metal tensile strength,the system reliability of lattice channel is better than the conventional one.

关键词： active cooling lattice channel supercritical hydrocarbon fuel enhanced heat transfer structural analysis

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主动冷却平板型结构件的最高温度及温度分布解析模型

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Acta Mechanica Sinica 2023年第5期39卷 38-47页

作者：胡国豪仲峰泉陈科挺 State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China

主动冷却平板型结构件应用广泛,快速评估其温度性能具有重要意义.本文提出了一种用于预测主动冷却平板型结构件的最高温度和温度分布的解析模型.解析模型有三种输入参数,包括热边界条件、材料特性和几何参数.分别讨论了两种热边界条件... 详细信息

主动冷却平板型结构件应用广泛,快速评估其温度性能具有重要意义.本文提出了一种用于预测主动冷却平板型结构件的最高温度和温度分布的解析模型.解析模型有三种输入参数,包括热边界条件、材料特性和几何参数.分别讨论了两种热边界条件下的求解过程,包括热流密度边界和对流传热边界.根据能量守恒原理,建立了热流密度边界模型(MHF).采用二次函数拟合真实热流密度分布的方法,建立了对流传热边界模型(MCHT).结构件的材料有铝合金和钛合金.结果表明,与数值模型结果相比,该解析模型能够预测最高温度,误差小于4%.该模型能够快速、准确地评估主动冷却平板型结构件的热防护性能.

关键词： Plate structure active cooling Thermal protection Convective heat transfer Analytical model

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Use of actively Cooled and Activated Coolant for Surface Quality Improvement in Ductile Material Grinding

Use of Actively Cooled and Activated Coolant for Surface Qua...

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The International Conference on Surface Finishing Technology and Surface Engineering

作者： Y. Gao and H. Lai Department of Mechanical Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China.

＜正＞An active cooling and activation approach for coolant during ductile material grinding is proposed and examined. The aim is to enhance the surface quality of the workpiece being machined by the grinding process. Problems in the existing cooling approaches, such as activation, cryogenic cooling, and chilled air cooling, are discussed. Experimental and computational studies of the effects of actively cooled and activated coolant for ductile material grinding were conducted. Experimental results show that the proposed approach is able to improve surface quality by up to 36.68% on average in terms of surface roughness Ra. In addition, it was found that surface roughness could be reduced if the coolant temperature is reduced. The results of the XRD tests show that the proposed method could, in general, produce low residual stress values. Further studies of this topic are necessary. Results of optical and SEM examinations also confirmed that the proposed approach is advantageous.

关键词： active cooling activated coolant grinding surface roughness residual stress.

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