摘要
大型结冰风洞气流温度均匀性直接影响风洞流场品质,而当前风洞温度场控制精度和均匀性不能满足低温高负荷试验工况要求。针对大型结冰风洞液氨蒸发器建立了一维流动换热仿真模型,采用出口气流温度对模型进行了验证。仿真结果表明蒸发器器出口气流温度随着换热器高度由高至低逐渐升高,与试验变化趋势一致。换热器各模块存在高度落差,使得各模块管内氨液蒸发压力和流量差异较大,导致蒸发器后气流温度场不均匀。基于仿真模型,研究分析了风洞试验高度、气流速度以及入口气流温度对蒸发器后气流温度场的影响,提出了使用进液阀和回气阀进行风洞蒸发器后气流温度场均匀性调节的方法。
The uniformity of the airflow temperature directly affects the quality of the flow field of the large-scale icing wind tunnel,while the current control accuracy and uniformity of the temperature field cannot meet the requirements of the low temperature and high load test conditions.In this study,a one-dimensional simulation model of ammonia evaporator was established,and the predicted outlet temperatures of airflow are validated against the test data.The simulation results show that the outlet air temperature of the evaporator gradually increases with the height of the heat exchanger,which is consistent with the experimental change trend.The height difference between the modules of the evaporator enlarges the ammonia vapor pressure and flow rate difference in the tubes of each module,resulting in the uneven temperature field of the airflow.Based on the simulation model,the influence of wind tunnel test height,air flow velocity,and inlet air temperature on the airflow temperature field at the outlet of evaporator was studied,and a control method of the inlet liquid valve and outlet vapor valve was proposed for the adjustment of airflow temperature field uniformity.
作者
张平涛
王文瑄
郭向东
陈良
侯予
Zhang Pingtao;Wang Wenxuan;Guo Xiangdong;Chen Liang;Hou Yu(Key Laboratory of Icing and Anti/De-Icing,China Aerodynamics Research and Development Center,Mianyang 621000,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《低温工程》
CAS
CSCD
北大核心
2021年第5期68-73,共6页
Cryogenics
基金
国家科技重大专项(HT-J2019-III-0010-0054)。
关键词
结冰风洞
制冷系统
大型换热器
温度均匀性
icing wind tunnel
refrigeration system
large heat exchangers
temperature uniformity
