Octane Number -Definition ,How to calculate Octane rating

Octane Number -Definition ,How to calculate Octane rating

What is Octane Number ?

汽油质量(汽油) - 辛烷值

在空气存在下燃料的受控燃烧,给出了内燃机的电力。低质量的燃料不会平稳地燃烧并导致偶尔的爆炸声,称为爆震。这大大降低了发动机的力量。

根据其辛烷值表示燃料的质量。不同的碳氢化合物具有不同的爆震趋势。产生最小爆震的燃料被认为是良好的燃料。
An arbitrary scale of octane number has been set up with n-heptane and 2,2,4-trimethylpentane (iso-octane) as the reference compounds. All fuels are graded in between these two limiting values by comparing with a suitable mixture of the above two compounds. 2,2,4-trimethylpentane (generally called iso-octane) has excellent anti-knocking properties and has been arbitrarily assigned an octane number of 100, whereas n-heptane, which is very prone to knocking is assigned an octane number of zero (0). Therefore, the antiknock property of a fuel increases with the increase in its octane number.

octane number
octane number

阅读更多:100 IC引擎和汽车技术问题

辛烷值的定义:

就这样辛烷值的任何燃料的数量被定义为“异辛烷和正庚烷混合物中的异辛烷百分比,其具有与在检查下的燃料相同的爆震”中。
辛烷值80的燃料以类似于具有80%的异丁烷的混合物和20%的正庚烷的混合物行为。直流汽油可以具有20至73的辛烷值。航空燃料被评定为100辛烷值。

如何衡量辛烷值

燃料的辛烷值在测试发动机中测量反对异辛烷和庚烷的混合物。如果汽油样品具有与含有90%异辛烷和10%庚烷的混合物相同的抗凹凸质量,则该样品的辛烷值定义为90.一些烃具有比异辛烷更高的抗敲击能力。因此,延长辛烷值定义以允许辛烷值高于100。

根据测量技术,定义了以下不同类型的辛烷值,

  • 研究辛烷值(RON);是最常用的辛烷值,并且通过在受控条件下的测试发动机中燃烧燃料和可变压缩比来确定。然后将结果与异辛烷和庚烷的混合物进行比较。
  • Motor Octane Number (MON);测试使用类似的测试引擎在RON测试中使用,但具有预热的燃料混合物,发动机速度更高(900rpm而不是600 rpm用于ron),可变点火正时为了进一步应力燃料的抗爆裂性。周一是一个更好的措施如何燃料如何实际表现在较高的载荷下比正常值更高。

根据燃料的组成,现代汽油的周一比罗恩低约8至10点,但罗恩和周一之间没有直接的联系。

Some times an average of RON and MON known asAnti Knock Index (AKI)在某些位置指定。这也被称为道路辛烷值(RDON)or泵辛烷值(PON)

Octane ratings of some compounds are:

  • n-庚烷-0
  • N-戊烷-62
  • 叔丁醇-98
  • 新辛烷苯-100
  • Ethanol -112
  • 甲醇-116
  • Toluene- 118

Sachin Thorat.

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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