| 摘要: |
| 本文将多层矩形微槽道与焦汤制冷器两种结构结合制作了多层微槽道J-T效应制冷器，回热段设置高低压矩形通道各三层交叉叠放。以氮气为制冷剂，采集其在多层微槽道J-T节流制冷器各测点温度，分析氮气在制冷系统各阶段的降温特性，对比氮气与氩气在微槽道J-T效应制冷器中的实验结果。结果表明：当进口压力为4 ~8 MPa时，随着压力的增大，氮气冷端温度越低，达到稳定冷端温度的时间越短，当进口压力为8 MPa时，氮气冷端在200 s左右趋于稳定温度约1.7 ℃；在相同进口压力下，氩气冷端温度低于氮气，但氮气达到冷端温度的时间比氩气更短，进口压力为7 MPa时，氮气冷端温度稳定时间比氩气提前约450 s；进口压力8 MPa的氮气与4~5 MPa的氩气温降相近，且氮气的降温时间更短，可以考虑用氮气代替氩气以减少制冷成本。 |
| 关键词: 焦耳-汤姆逊效应 微槽道 降温速度 |
| DOI： |
| 投稿时间：2016-11-07
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| 基金项目:上海市自然科学基金（14ZR1429100）资助。 |
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| Experimental Study on Multilayer Rectangular Micro-channel Joule-Thomson Cryocooler with Nitrogen |
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Geng Hui1, Cui Xiaoyu1, Wang Wenqing1, Weng Jianhua2
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| (1.School of Energy and Power Engineering, University of Shanghai for Science and Technology;2.School of Energy & Mechanical Engineering， Shanghai University of Electric Power) |
| Abstract: |
| A multilayer micro-channel Joule-Thomson (J-T) cryocooler was designed by combining several layers of rectangular micro-channels with a coke soup cooler. The heat recovery section was constructed using three layers of high- and low-voltage rectangular channels. Experiments were conducted using nitrogen as a refrigerant with inlet pressures ranging from 4 to 8 MPa, and the temperatures of each of the measuring points of the multi-layer microchannels in the J-T cryocooler were collected. The cooling characteristics of nitrogen in the various stages of the refrigeration system were analyzed, and the experimental results obtained when nitrogen and argon were used in the J-T cryocooler were compared. The results show that, when the inlet pressure is 4-8 MPa, a lower temperature for the nitrogen cold end with increasing pressure corresponds to a shorter time period to reach a stable cold-end temperature. When the inlet pressure is 8 MPa, the cold-end temperature reaches 1.7 ℃ at approximately 200 s. The argon cold-end temperature is lower than that of the nitrogen at the same inlet pressure; however, the time required for the nitrogen to reach the cold-end temperature is shorter than that for the argon. When the inlet pressure is 7 MPa, the temperature of the cold-end argon gas occurs approximately 450 s ahead of time. Further, the temperature drops for nitrogen at an 8-MPA inlet pressure and argon at a 4-5 MPa inlet pressure are similar. In addition, the nitrogen cooling time is shorter. Thus, the use of nitrogen instead of argon can reduce the cooling costs. |
| Key words: Joule-Thomson effect rectangle micro channel velocity of temperature falling |
