發(fā)布時間：2018-07-17 02:08

【摘要】：空間液氦溫區(qū)J-T節(jié)流制冷機技術(shù)是目前深空探測任務的主要制冷技術(shù),而逆流換熱器是液氦溫區(qū)J-T節(jié)流制冷機的關(guān)鍵部件之一.螺旋套管換熱器結(jié)構(gòu)簡單,體積重量較小,在空間液氦溫區(qū)J-T節(jié)流制冷機中被普遍采用.本文分析了螺旋套管換熱器效率對節(jié)流循環(huán)的影響,并對換熱器進行了理論分析和優(yōu)化設(shè)計.分析表明減小螺旋套管換熱器的管徑和螺旋直徑可以提高換熱器的換熱系數(shù),進而提升換熱器的效率.開展了相關(guān)的實驗研究,實驗結(jié)果驗證了理論分析的正確性,證明提升套管換熱器效率,可以降低節(jié)流循環(huán)對預冷量的需求,同時降低節(jié)流前溫度,最終提高預冷型J-T節(jié)流制冷機的整機效率和制冷量.
[Abstract]:J-T throttling refrigerator technology is the main refrigeration technology in deep space exploration at present, and countercurrent heat exchanger is one of the key parts of J-T throttling refrigerator in liquid helium temperature region. The helical casing heat exchanger is widely used in J-T throttle chiller with simple structure and small volume and weight. In this paper, the effect of the efficiency of spiral casing heat exchanger on throttle circulation is analyzed, and the theoretical analysis and optimization design of the heat exchanger are carried out. The analysis shows that the heat transfer coefficient of the heat exchanger can be increased by reducing the diameter of the tube and the diameter of the spiral tube, and then the efficiency of the heat exchanger can be improved. The experimental results verify the correctness of the theoretical analysis. It is proved that raising the efficiency of casing heat exchanger can reduce the demand for precooling rate of throttle cycle and reduce the temperature before throttling. Finally, the efficiency and refrigerating capacity of the pre-cooled J-T throttle refrigerator are improved.
【作者單位】： 中國科學院理化技術(shù)研究所空間功熱轉(zhuǎn)換技術(shù)重點實驗室;中國科學院大學;
【基金】：航空科學基金(20132446001) 國家重點基礎(chǔ)研究發(fā)展計劃(613322)資助
【分類號】：TB651

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