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活塞环-缸套动接触边界传热模型研究 被引量:1
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作者 孙正 黄钰期 俞小莉 《汽车工程》 EI CSCD 北大核心 2018年第3期349-355,共7页
由于润滑油膜内部存在多热效应耦合作用,现有内燃机流固耦合计算中常采用的活塞环-缸套间传热经验估计或热阻模型的计算结果与实际情况存在较大差异。为此本文中在线接触润滑模型的基础上,研究各热效应随工况的变化规律和相互间的耦合作... 由于润滑油膜内部存在多热效应耦合作用,现有内燃机流固耦合计算中常采用的活塞环-缸套间传热经验估计或热阻模型的计算结果与实际情况存在较大差异。为此本文中在线接触润滑模型的基础上,研究各热效应随工况的变化规律和相互间的耦合作用,建立了基于CFD流动传热计算结果修正的活塞环-缸套传热模型。结果表明,与热阻传热模型相比,本文中建立的修正传热模型算得的活塞温度场更符合实测的活塞温度数据;该模型经无量纲化处理后,可推广应用于其他活塞环-缸套传热计算。 展开更多
关键词 内燃机 流固耦合 活塞环缸传热模型 动力润滑
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高强化柴油机的缸套传热试验系统的数值分析
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作者 张超 赵哲 +1 位作者 马成功 黎苏 《河北工业大学学报》 CAS 2018年第5期54-61,共8页
设计了一套针对高强化柴油机的传热模拟试验系统.利用Standard k-ε湍流模型与涡耗散燃烧模型等对燃烧器、缸体、水套内的燃气燃烧、冷却水套的流场情况和冷却能力进行科学评价分析,并采用流固耦合分析方法获得缸套的温度场和热应力.研... 设计了一套针对高强化柴油机的传热模拟试验系统.利用Standard k-ε湍流模型与涡耗散燃烧模型等对燃烧器、缸体、水套内的燃气燃烧、冷却水套的流场情况和冷却能力进行科学评价分析,并采用流固耦合分析方法获得缸套的温度场和热应力.研究表明:燃烧器内的燃气温度分布呈现"内低外高,下低上高"的分布特点.冷却水套的冷却液的整体压力损失比较合理,平均流速较高,平均换热系数较大,水套近壁面温度分布比较均匀,表明了水套具有良好的冷却均匀性和较强的冷却能力. 展开更多
关键词 高强化柴油机 传热 STANDARD k-ε湍流模型 涡耗散燃烧模型 燃烧器
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真空浓缩结晶锅的设计 被引量:1
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作者 黄飞 陶进庆 《石油化工设计》 CAS 2000年第3期28-29,44,共3页
本文简单介绍了4m^3真空浓缩结晶锅的结构,阐述了各主要组成部分的设计思路。
关键词 真空浓缩 结晶锅 设计 传热装置
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Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets 被引量:15
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作者 李雅侠 吴剑华 +1 位作者 战洪仁 王翠华 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第2期253-261,共9页
The physical models of the outer and inner half coil jackets were simplified to two types of coiled ducts.The mathematic models of incompressible fluid at the condition of laminar flow and heat transfer in the two typ... The physical models of the outer and inner half coil jackets were simplified to two types of coiled ducts.The mathematic models of incompressible fluid at the condition of laminar flow and heat transfer in the two types of jackets for cooling process reactor were set up and solved by the semi-implicit method for pressure linked equa-tions consistent (SIMPLEC) algorithm based on a control volume method.The flow and temperature fields were given and the effects of Dean and Prandtl numbers on flow and heat transfer were studied.The results show that flow in the inner half coil jacket is found to exhibit transition of secondary flow pattern from two vortices to four vortices when the Dean number increases,but that in the outer half coil jacket is not found.The critical Dean num-ber is about 96.The inner half coil jacket has stronger heat transfer ability than the outer half coil jacket and this superiority is more evident with larger Prandtl number.However,as the Dean number is greater than 105,the flow resistance enhances more severely in the inner jacket than the outer jacket.For both jackets,the centers of the heated wall are the poorest for heat transfer. 展开更多
关键词 half coil jacket secondary flow temperature field heat transfer enhancement
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拉杆热收口机炉头的改造技术
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作者 王景雨 《昌河科技》 2007年第4期24-27,共4页
飞机拉杆热收口机是公司军品生产的关键设备,它承担着生产系列直升机拉杆的收口工作,我公司的一台热牧口机存在设备故障率高,杆件收口成品合格率低,工作状态不稳定等一系列问题。为此,本文就拉杆在收口时产生偏差现象分析该炉头工... 飞机拉杆热收口机是公司军品生产的关键设备,它承担着生产系列直升机拉杆的收口工作,我公司的一台热牧口机存在设备故障率高,杆件收口成品合格率低,工作状态不稳定等一系列问题。为此,本文就拉杆在收口时产生偏差现象分析该炉头工作状态,提出解决方案,通过方案的实施,效果良好。 展开更多
关键词 拉杆热收口机 炉头 传热套 功率 导轨
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Three-Dimensional Numerical Simulation of Natural Convection Heat Transfer in an Inclined Cylindrical Annulus 被引量:2
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作者 J.G. wei W.Q. Tao (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China) 《Journal of Thermal Science》 SCIE EI CAS CSCD 1996年第3期175-183,共9页
A numerical study of natural convection heat transfer in an inclined cylindrical annulus has been conducted. The inner cylinder of the annulus is maintained at uniform heat flux and the outer cylinder at constant tem... A numerical study of natural convection heat transfer in an inclined cylindrical annulus has been conducted. The inner cylinder of the annulus is maintained at uniform heat flux and the outer cylinder at constant temperature. The two end walls are assumed to be insulated. A numerical code has been developed to calculate the steady state three-dimensional natural convection in an inclined cylindrical annulus, and the research emphasis is placed on the influences of inclination angle or and modified Rayleigh number Ra on the natural convection heat transfer in the annulus. Computations were carried out in the ranges of 0°α 90*, 2.5×105 Ra* and Pr=0.7 with fixed aspect ratio of H=28.97 and radius ratio of K= 3.33. The numerical results are compared with the experimental correlations from the literature and the inclination angle effect on heat transfer is found to be insignificant. Detailed results of heat transfer rate, temperature, and velocity fields are presented for the case of or α=45° and discussion is also made concerning the comparison between the numerical and experimental results for the specific case of α=90°. 展开更多
关键词 enclosure flows natural convection numerical methods
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