Abstract: In order to study the heat transfer characteristics of a flat plane with uniform heat flux under the pulsating flow, an experimental setup was built. The heat transfer features of a High Temperature Co-fire Ceramic (HTCC) heating plane cluster in pulsating flow under different Reynolds numbers (Re=433～1733) were investigated. The pulsating frequency and pressure amplitude of the pulsating flow were 30 Hz and 165 Pa, respectively. Results showed that the pulsating flow with proper pulsating parameters (f=30 Hz, prms =165 Pa) has the capability to enhance obviously the heat transfer of the flat plane, and in this work, the enhanced heat transfer efficiency was at the value between 9.7% and 10.8%, changed linearly with the Reynolds number. Besides, results revealed that the heat transfer flux increases linearly with the Reynolds number no matter the flow is pulsating or not. However, the slop coefficient under the pulsating condition is larger, and is 1.26 times of that under the steady condition. Finally, results indicated that the addition of pulsating component in the steady flow increased the heat exchange inside the airflow.

Key words: laminar flow;pulsating flow, heat transfer enhancement;flow over a flat plane

摘要： 为研究脉动气流下等热流密度平面的换热特性，搭建了脉动气流强化传热实验台架，进行了不同雷诺数（Re=433～1733）的脉动气流下高温共烧陶瓷发热片组的换热实验研究，脉动气流的脉动频率f固定为30 Hz，脉动振幅prms固定为165 Pa。结果表明，在合适的脉动参数下（f=30 Hz, prms=165 Pa），脉动气流有效地强化了等热流密度平面的换热性能，本文获得的强化换热效率介于9.7%和10.8%之间，随着雷诺数的增加轻微地线性增加。另外，结果揭示了在层流流动中，不管在稳定气流下还是在脉动气流下，等热流密度平面的换热性能都随着雷诺数的增加而线性地增加，但脉动气流下线性拟合的结果的斜率较大，为稳定气流下的斜率的1.26倍。最后，结果显示了在稳定气流中加入脉动分量能迅速增大换热面下游的温度水平，预示着脉动气流在强化传热的同时，也增强了气流内部的热传递。

关键词: 层流, 脉动流, 强化传热, 横掠平板