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An experimental study on heat transfer and resistance coefficients of linearly arranged smooth and spirally corrugated tube bundles in cross-flow was performed. The heat transfer and resistance coefficients are presented in this paper with transverse and longitudinal tube-pitch and tube geometries taken into account. The experiment's results can provide technical guidelines for application to horizontal air preheater with arranged in-line spirally corrugated tube bundles, especially to the air preheater for CFBCBs (Circulating Fluidized Bed Combustion Boilers). 相似文献
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针对汽车行业高层次复合型人才需求与传统汽车专业人才培养机制不匹配的现状,浙江大学工程师学院积极落实新工科建设计划,创新开设汽车工程及其智能化研究生项目制培养模式。随着自动驾驶汽车技术发展的教学需求,在车辆工程专业课程设计与实践课程中以无人驾驶小车为教学载体,开展从无到有的无人驾驶小车平台搭建、功能设计与课程竞赛等多项实验实践教学活动,不仅加深了学生对前置专业理论课程的理解,还充分发挥跨学科团队成员优势培养学生发现问题、解决问题的能力,是面向汽车行业智能化的发展趋势,也是培养复合型、创新型和应用型专业人才的有益探索。 相似文献
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This article described the characteristics of the liquid nitrogen engine's ideal open cycle. Using two interconnecting strokes to achieve the power output can mitigate the trade-off between high efficiency and the potential mechanical complexity of multiple-cylinder engines. The total specific energy of the binary media (methane-nitrogen) cycle system could be much higher than the unitary medium (liquid nitrogen) cycle system. By theoretical analysis, the reasonably acceptable driving range proved the feasibility of the liquid nitrogen engine used for supplying power for a lightweight car. 相似文献
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正随着《3-6岁儿童学习与发展指南》(简称《指南》)的出台,和《幼儿教师专业标准》(试行)(简称《标准》)的颁布,学前教育的受关注度不断提高,更多的幼教工作者有了对照标准和自我审视的发展目标。近年来,随着学前教育的发展,我园走上了由总园辐射,引领分园发展的快速成长之路。办园规模的扩大,也吸引了许多新教师的加入。如何在短时间内让新教师适应我园的管理要求,胜任幼儿园保教工作;同时发挥现有骨干 相似文献
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独立研充院是高校科研管理组织体制的一种新的模式,文章在分析了这种新的模式其科研管理工作中存在问题的基础上,提出了突破常规思维制定切实可行的科研管理政策,加强研完院科研队伍和管理队伍建设等对策措施。 相似文献
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INTRODUCTION For critical structures and applications, requiring a given reliability, it is necessary to account for un-certainties and variability in material properties, loads and geometric tolerances. Using various reliability analysis methods, we can determine the reliability of existing structures or systems; or design new structures or systems with certain desired reliability. Manufacturing processes may involve many factors that have inherent uncertainties or random variations in th… 相似文献
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针对电池在恒温箱实验条件和实际应用情况差异的问题,搭建了典型换热环境下的电池实验装置,测试电池充放电过程中老化数据,探究不同换热环境下的电池性能变化规律。结果表明:恒温箱方案下,在30℃以下时电池放电倍率越高放电容量越大,30℃以上时则反之;而液体浸没式方案下,电池始终为放电倍率越大放电容量越小。在不同充电倍率下,电池的充电电流均是低温环境先于高温环境,恒温箱方案先于液体浸没式方案;此外液体浸没式方案下电池的循环老化衰减速率整体高于恒温箱方案下的表达速率。两种不同换热环境下,电池性能测试结果可以为电池热管理系统的设计提供参考。 相似文献
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INTRODUCTIONFollowingtheprogressinresearchonin cylinderheattransferprocessesofdieselen gines,theanalyticalevaluationoftheradiativeheattransferisbecomingmoreandmoreimpor tant.Manyresearchersproposedmodelsandde velopedcorrespondingapproachesforevaluatingt… 相似文献
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