气流非均匀分布时百叶窗翅片式换热器性能仿真

Simulation on characteristics of louvered-fin type heat exchanger in airflow maldistribution

针对百叶窗翅片式换热器传热和流动性存在的问题,在风洞试验台上,对两种不同结构(单、三排管)换热器进行了试验,测量了非均匀来流条件下流动和传热的相关值,采用分布参数模型,由威尔逊网格法确定出了翅片的传热关联式;同时结合数值仿真的方法,研究了气流非均匀分布对换热器换热性能的影响,结果表明:非匀流时总的换热系数会下降8.2%。将模拟结果与试验值进行了比较,两者基本吻合,说明仿真程序代码可用作高效换热器的设计工具。

Aiming at the flow and thermal performance of louvered-fin heat transfer,experimental study on the heat transfer with two different configurations（single and three-screen mode） were carried out on a wind tunnel test rig.The parameters of heat transfer and flow with non-uniform inlet flow conditions were measured experimentally,these served to determine the heat transfer correlation for the fin type using the distributed parameter model and the Wilson plot method.Numerical simulation was established,to predict the thermal performance of heat exchangers in non-uniform flow conditions.The results show that a drop of up to 8.2% is found in the overall heat transfer coefficient for non-uniform flow profile.Some calculated results are verified by the experimental datas,which show they are reasonable.The numerical code can be used as a design tool to develop more efficient heat exchangers.