CAJ | 학술논문

提出了一种可改善换热效率的百叶窗式纵翅片换热管的结构模型，对其进行简化，采用 Fluent 软件对换热管烟气侧流动与传热过程进行数值模拟，对比了两种百叶窗纵翅片与普通纵翅片的换热效率与压降，结果发现：百叶窗式纵翅片传热效果比普通纵翅片高130%以上。模拟了6组不同流体入口速度下传热与压降的变化情况，分析了百叶窗翅片间距与倾斜角度对传热与压降的影响，结果表明：入口速度越大，进出口温差越小，压降越大；翅片间距越大，进出口温差和压降都越小；翅片倾斜角度越大，换热效果相差不大，压降越大。搭建了简易实验平台对模拟结果进行验证。
제출료일충가개선환열효솔적백협창식종시편환열관적결구모형，대기진행간화，채용 Fluent 연건대환열관연기측류동여전열과정진행수치모의，대비료량충백협창종시편여보통종시편적환열효솔여압강，결과발현：백협창식종시편전열효과비보통종시편고130%이상。모의료6조불동류체입구속도하전열여압강적변화정황，분석료백협창시편간거여경사각도대전열여압강적영향，결과표명：입구속도월대，진출구온차월소，압강월대；시편간거월대，진출구온차화압강도월소；시편경사각도월대，환열효과상차불대，압강월대。탑건료간역실험평태대모의결과진행험증。
Longitudinal finned tube heat exchanger is a new type of tube heat exchanger used in flue gas heat recovery. In order to improve the heat transfer efficiency,the structural model of a new type of longitudinal louvered fin tubes was proposed and simplified. Using Fluent Software,the process of flow and heat transfer in gas phase was simulated for the longitudinal louver fined heat exchangers,and the transfer efficiency and pressure drop of two types of longitudinal louver fin and the common type exchanger were compared. The results showed that the heat transfer efficiency of longitudinal louvered fin heat transfer were over 130% higher than that of the common type. This paper simulates the changes of transfer and pressure drop at six different inlet velocities,and analyzed the influences of heat transfer and pressure drop caused by the difference of spacing and inclination angles on longitudinal louver fin. The results showed that at higher inlet velocities, the range of temperature was smaller,and the pressure drop was bigger. At bigger spacing the range of temperature and pressure drop were both smaller. Bigger inclination angles resulted in bigger pressure drop,but had little impact on heat exchange effects.