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基于电流转移法的直流断路器灭弧方案仿真
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作者 孟庆铂 赵羽佳 +1 位作者 段志强 王振刚 《实验室科学》 2016年第4期44-47,共4页
灭弧问题是直流断路器需要解决的难题之一。在对比分析了四种典型的直流断路器灭弧方案的基础上,得出了"电流转移法具有其他方法无法比拟的优点"结论,并结合案例对采用电流转移法的直流断路器系统进行等效理论分析,基于Matla... 灭弧问题是直流断路器需要解决的难题之一。在对比分析了四种典型的直流断路器灭弧方案的基础上,得出了"电流转移法具有其他方法无法比拟的优点"结论,并结合案例对采用电流转移法的直流断路器系统进行等效理论分析,基于Matlab建立仿真模型。仿真结果表明,基于电流转移法的直流断路器能够产生电流人工过零点,且具有较好的灭弧效果。 展开更多
关键词 电流转移法 直流断路器 灭弧方案 仿真
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Analysis of Heat Transfer of a Flat Plate Oscillating Heat Pipe, for Different Surfaces
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作者 Fraga De Cal Beatriz Vishak Jagadeesh Kumar 《Journal of Mechanics Engineering and Automation》 2017年第7期356-364,共9页
Recent and constant demands for greater power densities and smaller sizes of electronic systems have stimulated the growth of new designs of different passive heat transfer methods such as heat pipes. Particularly, OH... Recent and constant demands for greater power densities and smaller sizes of electronic systems have stimulated the growth of new designs of different passive heat transfer methods such as heat pipes. Particularly, OHPs (Oscillating Heat Pipes) are relatively novel devices, capable of removing high heat rates over long and short distances with not much temperature drop. This study concentrates on the design, building and assembling a test rig in order to analyse the flow pattern ofdeionised water through a 5 turns flat plate oscillating heat pipe under different heat inputs, which was made in the school of engineering and materials science of the Queen Mary University of London by two energy M.Sc. students. The filling ratio of the water is 40%. Furthermore an experimental study on the OHP thermal performance is carried out in order to examine the effects of different surface wet conditions: super hydrophilic, hydrophilic and cleaned brass. It is demonstrated the formation of liquid slugs and vapour plugs of the water along the channels. The experimental results showed that the hydrophilic surface tends to be more energy efficient. The heat transfer performance of the super-hydrophilic and hydrophilic is higher than brass by 5-12% and 15-20% respectively. 展开更多
关键词 Oscillating heat pipe heat transfer flow pattern thermal performance.
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