基于二维非绝热模型的脉管损失机理研究
来源期刊：中南大学学报(自然科学版)2012年第9期
论文作者：植晓琴 邱利民 甘智华 俞益波 曹强
文章页码：3672 - 3677
关键词：二维；非绝热；脉管体积；脉管效率
Key words：two-dimension; non-adiabatic; pulse tube volume; expansion efficiency
摘 要：基于CFD方法建立80~300 K温区脉管的二维非绝热模型，对不同体积脉管膨胀效率进行模拟计算。根据脉管内的温度分布特性，分析脉管体积与其热损失的内在联系。研究结果表明：脉管的最佳体积应取冷端扫气容积的10~11倍，而不是传统绝热模型给出的3~5倍，实际脉管管壁与气体间非绝热损失的存在使得脉管要达到较高的膨胀效率需采用更大的体积；脉管体积直接影响管壁和管内气体的温度分布，从而影响管壁与气体间的热损失以及气体自身温度不均匀产生的热损失；若对脉管进行一维或绝热假设忽略脉管热损失的影响，则会使脉管尺寸的设计值偏离实际最佳值。
Abstract: A two-dimension non-adiabatic CFD model was proposed to study the relationship between the void volume and expansion efficiency of pulse tube at 80-300 K. The gas physical parameters were analyzed. The results show that the best ratio of pulse tube volume to cold head expansion volume is 10-11, which is much larger than that of 3-5 from an adiabatic model. Heat losses caused by the wall in a non-adiabatic pulse tube make it necessary to use a large volume to obtain high expansion efficiency. The pulse tube volume has a strong impact on both the wall and gas temperature distribution, which subsequently influences the pulse tube heat losses. Traditional one-dimension or non-adiabatic pulse tube models which neglect the thermal losses are inapplicable to pulse tube dimension design.
植晓琴，邱利民，甘智华，俞益波，曹强
(浙江大学 制冷与低温研究所，浙江 杭州，310027)
摘 要：基于CFD方法建立80~300 K温区脉管的二维非绝热模型，对不同体积脉管膨胀效率进行模拟计算。根据脉管内的温度分布特性，分析脉管体积与其热损失的内在联系。研究结果表明：脉管的最佳体积应取冷端扫气容积的10~11倍，而不是传统绝热模型给出的3~5倍，实际脉管管壁与气体间非绝热损失的存在使得脉管要达到较高的膨胀效率需采用更大的体积；脉管体积直接影响管壁和管内气体的温度分布，从而影响管壁与气体间的热损失以及气体自身温度不均匀产生的热损失；若对脉管进行一维或绝热假设忽略脉管热损失的影响，则会使脉管尺寸的设计值偏离实际最佳值。
关键词：二维；非绝热；脉管体积；脉管效率
ZHI Xiao-qin, QIU Li-min, GAN Zhi-hua, YU Yi-bo, CAO Qiang
(Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China)
Abstract:A two-dimension non-adiabatic CFD model was proposed to study the relationship between the void volume and expansion efficiency of pulse tube at 80-300 K. The gas physical parameters were analyzed. The results show that the best ratio of pulse tube volume to cold head expansion volume is 10-11, which is much larger than that of 3-5 from an adiabatic model. Heat losses caused by the wall in a non-adiabatic pulse tube make it necessary to use a large volume to obtain high expansion efficiency. The pulse tube volume has a strong impact on both the wall and gas temperature distribution, which subsequently influences the pulse tube heat losses. Traditional one-dimension or non-adiabatic pulse tube models which neglect the thermal losses are inapplicable to pulse tube dimension design.
Key words:two-dimension; non-adiabatic; pulse tube volume; expansion efficiency
