在受限空间通过模拟试验研究细水雾作用下烟气温度的变化规律。实验中通过改变通风口面积、通风口与火源的相对位置及喷雾强度等因素，研究自然通风对细水雾降温速率的影响规律，定量地表征不同自然通风条件下降温速率的衰减比例，实验发现增加喷雾强度可以降低自然通风造成的降温速率衰减。研究结果可为细水雾灭火系统的工程应用和优化设计提供必要的参考依据。

Variational principles of smoke temperature are studied in confined space with water mist applying.  Effect of ventilation area,  position between ventilation and fire and water mist flux on temperature decreasing velocity is studied by experiments.  The attenuation of temperature decreasing velocity is described under different ventilation conditions.  It is found in experiments that the attenuation of temperature decreasing velocity caused by ventilation can be reduced by increasing water mist flux.  This paper provides necessary references for water mist application in fire protection.