Results 31 to 40 of about 1,175 (146)
Jianzhu Gangjiegou Jinzhan抗滑移系数是影响摩擦型高强螺栓连接承载力的主要因素之一。为研究火灾后摩擦型高强螺栓连接的剩余承载力，设计了由10.9级M20摩擦型高强螺栓和Q355B钢板组成的试件进行受剪试验，研究了钢板不同表面处理方式、不同加热温度自然冷却后摩擦型高强螺栓的抗滑移系数及其折减系数的变化规律。研究结果表明：钢板表面处理方式会影响摩擦型高强螺栓连接的抗滑移系数，且这种影响会随着加热温度的上升有所增大，经历同温度时喷砂表面处理方式连接比金属去毛刺打磨表面处理方式连接的抗滑移系数更大；当加热温度不超过300℃时 ...
张菊 +4 more
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Review of Research on Swirl Cooling Technology of Gas Turbine Blades [PDF]
ObjectivesThe effectiveness of cooling technology directly influences the performance and lifespan of gas turbine blades operating in high-temperature, and high-pressure environments.
LUAN Yong +3 more
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Microscopic fracture characterization and permeability evolutionary patterns of granites under cyclic thermal shock [PDF]
ObjectiveThis study aims to reveal the microscopic damage characteristics and permeability evolutionary patterns of high-temperature granite reservoirs fractured under cyclic thermal shock produced by low-temperature fluids like drilling fluids and ...
Chengcheng REN +5 more
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Research Progress of Immersed Cooling Technology for Lithium-ion Batteries in New Energy Vehicles [PDF]
Immersion battery cooling involves immersing the battery directly in a coolant and has the advantages of a simple structure, rapid cooling, and better temperature uniformity than conventional indirect liquid cooling, air cooling, and two-phase cooling ...
Li Zhe, Sheng Lei, Zhang Hua
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Effect of process parameters on Si segregation in an aluminum alloy during squeeze casting [PDF]
, 2016 The effects of pouring temperature, squeeze pressure, squeeze speed and cooling type on Si segregation in 6066 alloy were studied in indirect squeeze casting. Taking the difference between the silicon content of the hot spot zone after solidification and
BAO Pei-wei +4 more
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Gaoya dianqi, 1997 增大SF6断路器（GCB）开断能力和缩小其尺寸的新的有效技术有两个途径。一种方法是采用改进电弧冷却方式的新式喷嘴形状;另一种方法是改善排气筒中的热气流扩散,使电流开断后绝缘强度恢复速度提高。研究表明这些技术对将开断电流从50kA提高到63kA是有用的。 1.研制大容量、小尺寸GCB的难点 （1）母线端故障（BTF）开断电流从50kA增加到63kA,导致触头间电弧能量的增加。因而,63kA灭弧室中冷却电弧的能力应当提高,这也将导致产生的热气流的增加,必须有效地将热气流从灭弧室中排出;（2 ...
钟菊
doaj
Gaoya dianqi, 2019 变压器噪声是评价其运行状态的关键参数之一,为了实现基于噪声的变压器运行状态评价,对现场运行的72台110 kV主变进行了噪声检测,提出了奇偶次谐波比、高频比重以及频谱复杂度等3个特征量,并且按照冷却方式差异对上述特征量的数值分布进行了统计分析,确定了现场正常运行变压器噪声特征量的分布范围,分析了变压器运行年限对其噪声特征的影响。结果表明,冷却方式对于变压器平均声压级、奇偶次谐波比、高频比重以及频谱复杂度特征的分布具有较大影响,强迫风冷变压器特征参数普遍偏高,而变压器运行年限对上述特征并无明显影响 ...
吴晓文 +5 more
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Gaoya dianqi, 2008 为了防止生产过程中干式变压器树脂线圈的开裂、缩孔、白斑等问题,笔者研究了产生开裂等缺陷的形成内因,并根据于式变压器线圈材料性能随温度变化的特性,采用非线性分析建立了线圈浇注、固化、冷却过程瞬态温度场、热应力场三维有限元模型,并确定温度场中初始条件、边界条件,设计了一种有效模拟干式变压器浇注、固化、冷却过程中三维温度场和应力场分布的方法模拟其内部分布,从而改进干式变压器的工艺参数和性能并减少开裂等缺陷的产生。实验表明该仿真能够较好地再现线圈固化过程中的温度场和应力场分布。
金涛, 刘燕, 刘四维
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