主流速度对微细管式预冷器结霜和抑霜特性的影响
收稿日期: 2023-03-02
修回日期: 2023-03-23
录用日期: 2023-04-17
网络出版日期: 2023-05-12
基金资助
民机专项(MJ-2016-D-35)
Effects of main flow velocity on frosting and defrosting characteristics of microtubule precooler
Received date: 2023-03-02
Revised date: 2023-03-23
Accepted date: 2023-04-17
Online published: 2023-05-12
Supported by
Civil Aircraft Project(MJ-2016-D-35)
基于不同的实验工况，对微细管式预冷器分别开展了结霜和抑霜的地面实验研究，具体的实验工况为：主流的温度和湿度值分别为50 ℃和1.8 g/kg；主流速度分别为10、20、30 m/s。在不同主流速度的抑霜实验中，向主流中喷射的无水甲醇-水的质量比均为1.0。结霜和抑霜的地面实验结果均表明，主流速度对微细管式预冷器的结霜和抑霜特性均有显著的影响，且增大主流速度，能够明显地减少霜层在预冷器微细管束壁面外侧的凝结和累积量。在抑霜实验中，由于向主流中喷射了质量比为1.0的无水甲醇，预冷器微细管束的壁面温度显著增大，且抑霜效果得到明显改善，自由来流的压力损失系数亦明显下降，且预冷器的换热率显著增大。此外，随着主流速度逐渐增大，自由来流的压力损失系数急剧增大，而凝结在预冷器微细管束壁面外侧的霜层覆盖面积明显减小，这表明增大主流速度有利于抑制霜层在预冷器微细管束外侧壁面上的凝结和累积。
韦宏 , 王鹏 , 董威 , 郭晓峰 , 李治达 , 杨学森 , 唐中富 , 付超 . 主流速度对微细管式预冷器结霜和抑霜特性的影响[J]. 航空学报, 2024 , 45(2) : 128639 -128639 . DOI: 10.7527/S1000-6893.2023.28639
Based on different experimental conditions， the ground experimental studies on the frosting and defrosting of the microtubule precooler have been carried out. The specific experimental conditions are as follows： the temperature and humidity value of the mainstream are 50 ℃ and 1.8 g/kg， respectively， and the flow velocity of the mainstream is 10， 20， and 30 m/s， respectively. For the defrosting experiments at different main flow velocities， the mass ratio of the anhydrous methanol-to-water spraying into the main flow is 1.0. The results of the frosting and defrosting ground experiments show that the main flow velocity has significant effects on the frosting and defrosting characteristics of the microtubule precooler. In addition to increasing the main flow velocity， it can significantly reduce the condensation and accumulation of the frost layer on the outside wall surface of the microtubule bundle of the precooler. In the defrosting experiments， due to the spraying of anhydrous methanol with a mass ratio of 1.0 into the main flow， the wall surface temperature of the microtubule bundle of the precooler can be significantly increased， and the defrosting effect can also be clearly improved. As a result， the pressure loss coefficient of the freestream deceases distinctly and the heat transfer rate of the precooler appreciably increases. In addition， with the increase of the main flow velocity， the pressure loss coefficient of the freestream increases sharply， while the covering area of the frost layer on the outside wall surface of the microtubule bank of the precooler clearly decreases， which indicates that increasing the main flow velocity is beneficial to the suppression of the condensation and accumulation of frost layers on the outside wall surface of the precooler microtubule bank.
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