From figure 2.12 notice that While spray ratio between air and fuel ethanol is mainly based on the theory (λ tip = 1) found that average temperatures of the fuel spray ethanol are also lower than the temperature of ignition with yourself stay. Because ethanol is the latent heat of vaporization (Latent heat of evaporation) high. Therefore, it is necessary to use the heat energy in this process greatly. Moreover, Ethanol is also high temperature ignition by yourself. Therefore, the ethanol can detonate himself. To solve the problem mentioned above, it is important to increase the temperature after compression to rise from the original for the use of ethanol as a fuel.
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