Experimental Study on Minimum Ignition Energy of Diesel-Air Cloud
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摘要: 为了研究柴油的最小点火能量，分别在激波管和外场模拟油箱中开展了-10号柴油的点火引燃实验。激波管实验结果表明，柴油-空气云雾的最小点火能量与柴油-空气当量比近似呈“L”型曲线关系，在当量比为1.31时，最小点火能量达到极小值0.16 MJ/m2(约5.02 kJ)；外场实验结果表明，油液区的最小点火能量是油-蒸汽区的6.74倍，并且油-蒸汽区的最小点火能量不随柴油量的变化而改变，油液区的最小点火能量则随柴油量增加而线性增大。在柴油量为21 mL时，外场实验测定的油液区最小点火能量为36.42 kJ，是激波管实验最小点火能量极值的7.25倍。Abstract: In order to study the minimum ignition energy (MIE) of diesel, ignition experiments of -10# diesel were carried out in the shock tube under condition of spray and in the external field diesel tank.Results of the shock tube experiment show that the MIE of diesel cloud is approximate to a L-shaped curve in relationship with equivalence ratios, and the minimal MIE reaches 0.16 MJ·m-2(about 5.02 kJ) when the equivalence ratio is 1.31.Results of the external field experiment show that the MIE of the oil zone is 6.74 times of that of the oil-vapor zone, and it increases with diesel quantity linearly.However, the MIE of the oil-vapor zone does not change with diesel quantity.In addition, when the volume of diesel is 21 mL, the MIE of the external field experiment is 36.42 kJ, which is 7.25 times the minimal MIE of shock tube experiment.
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Key words:
- diesel cloud /
- minimum ignition energy /
- vapor /
- dispersion
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图 3 柴油-空气云雾最小点火能量随当量比的变化
Figure 3. Variation of $E_{\min }^{\prime}$ with equivalence ratios for diesel-air cloud
图 4 在油箱不同位置处以最小点火能量引燃柴油的过程
Figure 4. Diesel ignition process at different positions of the tank by minimum ignition energy
表 1 不同当量比下柴油-空气云雾的最小点火能量
Table 1. Minimum ignition energy of diesel-air cloud with different equivalence ratios
V/(mL) C/(g/L) φ E′min/(MJ/m2) 5.2 0.026 0.32 0.66 10.4 0.052 0.65 0.28 15.6 0.078 0.98 0.23 21.0 0.105 1.31 0.16 26.2 0.131 1.63 0.18 46.6 0.233 2.89 0.28 
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表 2 3 L柴油的外场实验结果
Table 2. Results of the external field experiment for 3 L diesel
h/(mm) Emin/(kJ) Pool fire 90 45.59 No 45 45.59 Yes 0 45.59 Yes -55 307.20 Yes
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表 3 不同体积柴油油液区的最小点火能量
Table 3. Minimum ignition energy of the oil zone for different volume of diesel
V/(L) Emin/(kJ) 0.010 17.58 0.015 26.46 0.021 36.42 0.500 62.68 1.000 114.09 1.500 178.64 3.000 307.20
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