应用粒子成像测速技术(PIV)对平焰燃烧湍流场及其对应的冷态流场进行了测量，对热态流场与相应冷态流场进行了对比分析。结果表明，与冷态流场相比，燃烧状况下流场的回流区宽度增加，回流速度明显增大；附壁射流区厚度变薄，附壁射流区内的径向速度持续增加。实验表明，在湍流燃烧中冷态流场模拟与实际燃烧过程的流动存在较大差异。由于燃烧使气体温度升高体积膨胀产生的推力对流场有很大影响，是不能忽略的。
Experiments have been performed to investigate the differences between the turbulent flow of flat flame combustion and the cold airflow under the same condition. The reactive fields and the cold flow fields were measured by PIV technique, and the velocity fields have been acquired successfully. The results show that compared to the cold flow, it is found that the width of the reverse flow zone is bigger, and the reverse flow velocity increases; the thickness of jet flow along the wall is thinner and the radial velocity increases continually. It is suggested that there are obvious difference between cold flow and actual combustion. The force caused by combustion air volume expanding has great effect on turbulent flow, and it couldn’t be ignored.
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