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对机载密封机箱的散热问题进行了研究,定量地给出了一些设计数据,填补了图纸上的空白,对提高密封机箱的散热性能很有帮助. 相似文献
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工作在潮湿、粉尘、腐蚀等恶劣环境下的电子设备需要密封,当机箱内部元器件的总发热功率过高时急需一套有效的散热系统来保证该电子设备安全稳定地工作.文中设计了一种环路热管系统.该环路热管系统的蒸发段位于密闭机箱内部,通过工质的相变源源不断地将元器件的热量传递到位于机箱外侧的冷凝段中.若PCB上电子元器件的结温低于其上限值,则该环路热管散热系统满足要求.理论计算和数值计算表明,该环路热管散热系统能够很好地保证高热功率密闭计算机安全稳定工作. 相似文献
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文中以在严酷环境条件下使用的某型便携式电子设备为研究对象,结合传统机箱结构,设计出一款在高温环境下强迫风冷散热的密闭机箱。通过中空盖板设计,让气流在中空盖板内流动,以提高发热芯片与空气的换热速度,有效地降低整机设备及内部模块的温度,保证设备在湿热、盐雾、淋雨、高温等恶劣环境下能长时间正常工作。为了验证该强迫空冷散热设计的可实施性和量化设计指标,利用ANSYS Fluent软件对其结构装置在不同环境温度和风扇功率下的散热效果进行了三维仿真。仿真结果表明,中空盖板内的最优通风风速为1.5 m/s,该通风风速可使密闭机箱的散热效果与电能消耗达到最优平衡。 相似文献
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为了避免机箱开孔散热方式产生的不良后果,提出了一种在模块上增加散热组件的解决方法,以解决全封闭机箱内部元件的发热问题。散热组件通过在插件面板上增加翅片、风扇、带热管的导热基板,实现发热元件热量由内向外的快速传递。对散热翅片性能进行了试验,测试结果证明模块上附加的散热组件达到了设计目标。 相似文献
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在介绍Browser/Server结构信息系统开发方式的基础上,通过分析工艺装备的生产特点和工装生命周期管理过程,结合企业的需要,开发了一套Web环境下的工装管理信息系统,实现工艺装备的全生命周期信息管理,解决该企业工装管理过程中存在的问题.该系统具有高效、安全和适用性广的特点,在企业的实际运行过程中取得了较好的效果. 相似文献
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Direct immersion cooling has been considered as one of the promising methods to cool high power density chips. A fluorocarbon
liquid such as FC-72, which is chemically and electrically compatible with microelectronic components, is known to be a proper
coolant for direct immersion cooling. However, boiling in this dielectric fluid is characterized by its small value of the
critical heat flux. In this experimental study, we tried to enhance the critical heat flux by increasing the nucleate boiling
area in the heat spreader (Conductive Immersion Cooling Module). Heat flux of 2 MW/m2 was successfully removed at the heat source temperature below 78°C in FC-72. Some modified boiling curves at high heat flux
were obtained from these modules. Also, the concept of conduction path length is very important in enhancing the critical
heat flux by increasing the heat spreader surface area where nucleate boiling occurs. 相似文献
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介绍了一种无环控冷却条件下的机载雷达发射机结构设计,重点讨论了机载恶劣环境条件下的散热问题。 相似文献
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An experiment has been conducted on the flow and heat transfer characteristics of film coolant injected from a row of five
holes with compound angle orientations of 35° inclination angle and 45° orientation angle. The Reynolds number number based
on the mainstream velocity and injection hole diameter 3.58 x104. Three-dimensional velocity, film cooling effectiveness and heat transfer coefficient data are presented at three different
mass flux ratios of 0.5, 1.0 and 2.0. Flow entrainment has been found between the vortices generated by adjacent injectants.
The injectant with compound angle orientation entrains not only the mainstream boundary layer flow but also the adjacent injectant.
Because of the flow entrainment, the injectant. With compound angle orientation is characterized by a single vortex while
two bound vortices are usually observed in the case of simple angle injection. The strength of the secondary flow depends
strongly on the mass flux ratio, which shows significant influence on the film cooling effectiveness and heat transfer coefficient. 相似文献
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A numerical simulation has been performed for the investigation of flow and heat transfer characteristics of a film cooling
system injected through a hole with compound angle orientation. The finite volume method is employed to discretize the governing
equations based on the non-orthogonal coordinate with non-staggered variable arrangement. In order to analyze flow and heat
transfer characteristics, velocity, temperature, aerodynamic loss coefficient, skin friction and vorticity are calculated
with the variation of the skew angle. The maximum longitudinal vorticity and aerodynamics loss depend strongly on the skew
angle. For the symmetric case of β=0 deg, a pair of counter-rotating vortices are formed and the maximum value of the film
cooling effectiveness has appeared in the center plane where the skin friction is the minimum. For the skew angle of β=30
deg and above, only one strong counter-clockwise vortex remains in the downstream region and the maximum value of the film
cooling effectiveness are obtained on the right side of the vortex. The predicted results for the film cooling effectiveness
show good agreements with previous experimental data except the near-hole region. 相似文献
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在传统的工艺中万吨桨的中孔和端面都采用干式切削加工,这就存在切削区温度高,刀具寿命低的问题,使用纯水喷雾冷却技术可以较好地解决这一问题,并且纯水喷雾冷却还具有经济性好,绿色环保,加工表面质量好等优点. 相似文献