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高速电主轴热特性建模与冷却系统参数优化方法研究 被引量:2
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作者 孙树文 高振涛 +1 位作者 乔云飞 王军见 《制造技术与机床》 北大核心 2023年第10期90-97,共8页
电主轴热变形是影响加工精度的主要因素之一,而热变形主要由电主轴温升引起,其中冷却系统是影响电主轴温升的关键因素。为了优化冷却系统关键技术参数,以某型号高速电主轴为例,建立了考虑主轴不同旋转面换热系数的热特性模型,提高了温... 电主轴热变形是影响加工精度的主要因素之一,而热变形主要由电主轴温升引起,其中冷却系统是影响电主轴温升的关键因素。为了优化冷却系统关键技术参数,以某型号高速电主轴为例,建立了考虑主轴不同旋转面换热系数的热特性模型,提高了温度场和热误差的仿真精度,并进行了主轴不同转速的温升与热误差实验,验证了仿真模型的正确性;基于所建立的电主轴热特性仿真模型,利用正交试验法进行了冷却系统参数优化,冷却参数优化后的仿真实验结果表明,电主轴最高温度降低了2.0℃,热变形减小了25.76μm,为电主轴冷却系统优化提供了理论参考。 展开更多
关键词 高速电主轴 热特性建模 冷却系统 流固耦合 正交试验
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锂离子电池各向异性导热的实验与建模 被引量:19
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作者 冯旭宁 李建军 +3 位作者 王莉 高剑 何向明 欧阳明高 《汽车安全与节能学报》 CAS 2012年第2期158-164,共7页
锂离子电池热特性影响其性能、安全和寿命,需要进行专门研究。该文建立了锂离子电池的热模型,其中的锂离子电池被简化为具有各项异性导热的长方体。以实验确定电池的各向异性导热系数。在导热系数和对流换热系数未知的前提下,基于建模... 锂离子电池热特性影响其性能、安全和寿命,需要进行专门研究。该文建立了锂离子电池的热模型,其中的锂离子电池被简化为具有各项异性导热的长方体。以实验确定电池的各向异性导热系数。在导热系数和对流换热系数未知的前提下,基于建模仿真结果,发现了3个特征温度点对应的等温线与导热系数和对流换热系数的关系,即"三线共点"图解法。利用该图解法所进行的仿真结果,与单体电池的实验值相吻合。这证明:垂直于电池内部叠层方向的导热系数小于平行方向的导热系数。 展开更多
关键词 三元锂离子电池 热特性建模 各向异性导系数 “三线共点”图解法
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Modeling and Parametric Study of the Heat Transfer Inside a Lithium Bromide Flow Confined by Wire Screen
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作者 Herbert Obame Mve Romuald Rulliere Philippe Haberschill 《Journal of Energy and Power Engineering》 2015年第5期417-425,共9页
The present study deals with the numerical analysis of heat transfer inside a lithium bromide-water solution flowing down between finely meshed plastic wire screens. These screens confine the flow through capillary ac... The present study deals with the numerical analysis of heat transfer inside a lithium bromide-water solution flowing down between finely meshed plastic wire screens. These screens confine the flow through capillary action while allowing the water vapour transfer inside an innovative absorber technology. The complex menisci shape formed on the confinement grid level, where the surface tension forces are of first importance, are reconstructed by a volume-of-fluid model. A continuum surface force model is used to account for the surface tension force. A static contact angle is used to define the wall adhesion. A new algorithm, consisting to set an unique constant temperature at the liquid/vapour interface and to determine the evolution of heat transfer characteristics over the simulation domain, has been implemented and validated by analytical solution. A parametric study has been conducted to determine the effect of the geometry, the contact angle and the shape of the wire on the heat transfer. 展开更多
关键词 Heat transfer wire screen complex menisci liquid/vapour interface numerical simulation.
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Theoretical modeling of chemical nonequilibrium stagnation point boundary layer heat transfer under rarefied conditions 被引量:3
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作者 WANG ZhiHui BAO Lin TONG BingGang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第5期866-874,共9页
This paper theoretically studies the recombination-dominated nonequilibrium reacting flow inside the stagnation point bound- ary layer (SPBL) and the heat transfer characteristics under rarefied conditions. A genera... This paper theoretically studies the recombination-dominated nonequilibrium reacting flow inside the stagnation point bound- ary layer (SPBL) and the heat transfer characteristics under rarefied conditions. A general model is intuitively proposed to de- scribe the energy transfer and conversion along the stagnation streamline towards a slightly blunted nose with non-catalytic wall surface. It is found that the atoms recombination effects inside the SPBL could be equivalent to a modification on the de- gree of dissociation in the external flow. As a result, a recombination nonequilibrium criterion Dar, that is a specific DamktSh- let number, is introduced to characterize the nonequilibrium degree of the reacting flow in the SPBL, and then, based on the general model and Dar, a bridging function indicating the nonequilibrium chemical effects on the SPBL heat transfer is estab- lished. By using the explicitly analytical bridging function, the flow and heat transfer mechanisms, including the real gas flow similarity law and the nonequilibrium flow regimes classification, are discussed. In addition, the direct simulation Monte Carlo (DSMC) method has also been employed to systematically validate the analytical results. 展开更多
关键词 chemical nonequilibrium rarefied gas effects stagnation point boundary layer heat transfer DSMC
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