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采用热色液晶定量测温技术对稳态及脉冲式空气－氮气圆形浸没射流冲击冷却换热进行了实验研究．脉冲射流的实验结果表明，对于喷嘴直径 Ｄ＝３ｍｍ的情形，无论脉冲频率高低，均无强化换热效果；对于Ｄ＝１０ｍｍ的情形，在较高Ｒｅ数时出现个别工况的驻点换热强化．脉冲射流表现出换热系数沿径向分布趋于均匀的特点．
An experimental study was conducted on the steady-state and pulsed air-nitrogen circular immersion jet impingement cooling with thermochromatic liquid crystal quantitative temperature measurement. The experimental results of pulsed jet show that for the case of nozzle diameter D = 3mm, there is no enhancement effect of heat transfer no matter the pulse frequency is high or low. For D = 10mm, strengthen. Pulsed jets show a characteristic that the heat transfer coefficient tends to be uniform along the radial direction.