火源生成的火焰区是燃烧引起的化学反应区域。
The flame area which has developed from the fire source is an area of chemical reaction caused by combustion.
结果表明：图像清晰地显示了爆轰波阵面的诱导激波、横波及化学反应区。
The results show that the transverse waves, leading shock and reaction zone can be clearly observed in the consecutive images.
旋涡加速了未反应区的化学反应速率。
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