Gasoline vapor/air premixed flame's unstretched laminar burning velocity
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摘要: 为了研究汽油蒸气/空气的爆炸特性，介绍了汽油蒸气/空气预混火焰的无拉伸层流燃烧速率。通过实验研究了无拉伸层流燃烧速率，与汽油的主要组分异辛烷和正庚烷与空气的预混火焰层流燃烧速率做了对比，发现汽油蒸气/空气的无拉伸层流燃烧速率小于异辛烷和正庚烷与空气的预混火焰无拉伸层流燃烧速率，但无拉伸层流燃烧速率随当量比的变化规律相同，随着当量比增大，无拉伸层流燃烧速率呈先增大、再减小的变化趋势，最大值在当量比为1处取得。Abstract: In order to characterize the explosion of the gasoline vapor/air mixture, we introduced the unstretched laminar burning velocity of premixed gasoline vapor/air flame to the research of the mixture. The unstretched laminar burning velocity was experimentally studied and compared with those of two mixture gases consisting of such major compositions of gasoline as isooctane and n-heptane, respectively. The results show that the unstretched laminar burning velocity of the prepared gasoline vapor/air mixture is lower than those of the isooctane/air mixture gas and the n-heptane/air misture gas, but it takes on a similar tendency to change with the equivalence ratio, i.e. the unstretched laminar burning velocity firstly increases and then decreases with the increase of the equivalence ratio, and the maximum value can be obtained at the equivalence ratio of 1.
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Key words:
- gasoline vapor /
- deflgration /
- premixed flame /
- overpressure /
- unstretched laminar /
- burning velocity
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图 3 汽油蒸气体积分数为2.00%的汽油蒸气/空气预混火焰传播高速摄影图像
Figure 3. High-speed images of gasoline vapor/air premixed flame propagation at the gasoline vapor volume fraction of 2.00%
图 4 汽油蒸气体积分数不同的条件下汽油蒸气/空气预混火焰传播高速摄影图像
Figure 4. High-speed images of gasoline vapor/air premixed flame propagation at different gasoline vapor volume fractions
图 6 拉伸火焰速率与火焰拉伸率之间的关系
Figure 6. Relationship between stretched flame speed and flame stretch rate
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