论文部分内容阅读
通过对单回路紫铜–水脉动热管壁温振荡特性的实验研究,揭示传热功率、充液率和管径对热管启振及传热性能的影响。实验采用风冷却方式和定热流加热,测试稳定运行时加热段和冷却段外壁温的波动特性曲线,得到温度振荡与热管传热功率之间的的内在关系;同时研究了充液率和管径对管壁温振荡特性的影响。结果显示,随加热功率的增加,管壁温振荡呈现四种状态,无振荡、启振、大幅振荡和小幅均匀振荡;频率呈现由小到大和高位稳定振荡的特点。充液率和管径对热管的启振功率、振幅和频率都有影响;中间管径和中间充液率热管的启振功率最小;管内径越小,充液率越大,热管的温度振幅越大;中间管径、中间充液率的热管的平均振荡频率最大,而大管径、小充液率管子的平均振荡频率最小。当传热功率达到一定值时,振荡转变为小幅均匀振荡,充液率和管内径对热管振幅和频率的影响变小。
Through the experimental study on the wall temperature oscillation characteristics of single-circuit copper-water pulsating heat pipe, the effects of heat transfer power, liquid filling rate and pipe diameter on the heat-conducting and heat transfer properties of the heat pipe were revealed. In this experiment, the wind cooling method and the constant heat flow heating were used to test the fluctuation curve of the outer wall temperature of the heating section and the cooling section during the steady operation. The relationship between the temperature oscillation and the heat pipe heat transfer power was obtained. Effect on wall temperature oscillation characteristics. The results show that with the increase of heating power, the tube wall temperature oscillation presents four states without oscillation, start-up vibration, large oscillation and small uniform oscillation; the frequency appears stable oscillation from small to large and high. Liquid filling rate and diameter of the heat pipe start-up power, amplitude and frequency have an impact; intermediate diameter and the middle of the charge rate heat pipe minimum power startup; tube diameter is smaller, the greater the liquid filling rate, heat pipe temperature amplitude The average oscillation frequency of the heat pipe with the middle diameter and the middle filling rate is the largest, while the average oscillation frequency of the pipe with the large diameter and the small liquid filling rate is the smallest. When the heat transfer power reaches a certain value, the oscillation transforms into a small and even oscillation, and the influence of liquid filling rate and tube diameter on the heat pipe amplitude and frequency becomes smaller.