为深入探究在非均匀热流密度条件下不同操作参数对脉动热管传热特性的影响，进而拓宽脉动热管使用场景，设计并搭建了一种非均匀热流密度下脉动热管传热性能的测试装置。该装置包括脉动热管主体装置、加热装置、冷却水循环装置、数据测量采集装置、充注工质及抽真空装置。之后进行了实验稳定性测试，保证实验结果的可靠性。在充液率为50%和70%的情况下，选用乙醇、HFE-7100两种工质，分别进行了加热功率为40~140 W、无量纲热差为0~0.56的实验测试，对脉动热管的传热性能、蒸发段温度及内部压力波动特性进行实验研究。结果表明：均匀热流密度下，当加热功率较小时HFE-7100工质表现出更低的运行热阻；随着加热功率的增加，乙醇和HFE-7100工质在50%和70%充液率下运行热阻逐渐接近。非均匀热流密度下，随着无量纲热差的增加，脉动热管表现出低于和接近均匀热流密度下的运行热阻，且高充液率的脉动热管在启动和运行时，能够表现出更好的稳定性及传热性能。在非均匀热流密度下，70%充液率的脉动热管装置存在一个无量纲热差临界值0.33，大于该值后，管内不同热流密度侧气液相工质能够较快地打破平衡，改善管内循环流动状态，并降低运行热阻。乙醇工质在均匀热流密度加热时，高充液率下管内存在大量长液塞，容易出现工质流动停滞现象。非均匀热流密度加热时，由于装置加热段存在高热流密度侧，使得不同弯头的管内工质移动方向具有一致性，减少内部流体流动过程中的停滞和反向，从而可以在一定无量纲范围内提升脉动热管装置的传热性能。

To further explore the influence of different operating parameters on the heat transfer characteristics of pulsating heat pipe under the condition of non-uniform heat flux and broaden the application scenarios of pulsating heat pipe, this study constructed an experimental platform of pulsating heat pipe with non-uniform heat flux. The platform consists of pulsating heat pipe module, heating module, cooling water circulation module, data measurement and acquisition module, and filling and vacuum working medium module. In order to ensure the reliability of the experimental results, the stability test was carried out. Under the conditions of 50% and 70% liquid filling rate, the performance of heat transfer, evaporation temperature and internal pressure fluctuation characteristics were studied by using ethanol and HFE-7100 as the working mediums and varying the heating power from 40W to 140 W and the dimensionless heat difference from 0 to 0.56. The results show that the HFE-7100 has lower operating thermal resistance at low heating power under uniform heat flux. With the increase of heating power, the thermal resistances of the two kinds of working fluid gradually get close to each other at 50% and 70% filling rate. Alone with the raise of dimensionless heat difference, the operating thermal resistance of the pulsating heat pipe under non-uniform heat flux is lower or close to the uniform heat flux. And the evaporation temperature of the pulsating heat pipe with high liquid filling rate has better stability during start-up and operation. There exists a critical value of dimensionless heat difference (0.33) for pulsating heat pipe under 70% liquid filling rate of non-uniform heat flux. When the value exceeds 0.33, the vapor-liquid working fluid at different heat flux sides can break the equilibrium rapidly, thus improving the circulating flow state and reducing the operating thermal resistance. When the ethanol working medium is heated with a uniform heat flux density, there are a large number of long liquid plugs in the tube under the high liquid filling rate, which is prone to the phenomenon of working medium flow stagnation. When the non-uniform heat flux density is heated, due to the high heat flux density side in the heating section of the device, the moving direction of the working fluid in the pipe of different elbows is consistent, reducing the stagnation and reversal in the internal fluid flow process, so as to improve the heat transfer performance of the pulsating heat pipe device within a certain dimensionless range.