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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。
The turbulent flow field and its corresponding cold flow field were measured by particle image velocimetry (PIV). The comparison between the hot flow field and the corresponding cold flow field was carried out. The results show that, compared with the cold state, the width of the recirculation zone increases and the recirculation velocity increases obviously in the combustion condition. The thickness of the wall decreases and the radial velocity in the attached area increases. Experiments show that the turbulent flow in the cold flow simulation and actual combustion process there is a big difference. Due to the combustion of the gas temperature increases due to volume expansion thrust has a great impact on the flow field can not be ignored.