Thekey differencebetween unleaded and super unleaded petrol is thatUnleaded petrol has minimum RON 91 whereas super unleaded petrol has minimum RON 97-98.
The term RON stands for Research Octane Number. It is a measure of the effect of fuel on an engine. We can measure it by running the fuel in a test engine under controlled conditions (with a variable compression ratio) and comparing the results of this test with a mixture of isooctane and n-heptane.
内容
1.Overview and Key Difference
2.为什么将铅添加到汽油中
3.What is Unleaded
4.What is Super Unleaded
5.并排比较 - 无铅和超级无铅形式
6。概括
为什么将铅添加到汽油中？
汽油是烃燃料的挥发性液体形式。我们可以通过分数隔离distillation石油,它是有用的作为燃料ternal combustion engines. Manufacturers mix some additional compounds with petrol in order to enhance its use in engines.Hydrocarbonslike isooctane or benzene and toluene are some examples of such additives which are important in increasing its octane rating. This octane number measures the ability of an engine to cause self-ignition in the engine cylinders (which causes knocking).
Figure 01: Leaded Petrol is not in use at present due to its harmful effects
In premature ignition, when petrol and air mixture caught before the spark passes through the spark plug, it pushes against the crankshaft producing a knocking sound. Because of this knocking, the engine tends to overheat and loose power. Therefore, it damages the engine in the long run. Therefore, we should increase the octane number of the fuel. Other than adding hydrocarbons stated above, we can increase the octane number by adding certain lead compounds as well.
What is Unleaded Petrol?
这是一种不含铅的汽油。如上所述，铅化合物可用作燃料的抗敲击剂。但是，这是人类和其他动物的剧毒元素。此外，当这些化合物在发动机中燃烧时，烟雾将带有烟雾。它们将积累在引起健康问题的生物的呼吸道中。在极端条件下，该元素甚至可以具有致癌性。此外，它会引起环境污染。由于这些原因，现在不使用含铅的汽油，而人们使用无铅汽油。这种形式的汽油不会产生含有铅的有害烟雾。
人们发现了通过使用无铅汽油消除车辆中敲击问题的各种策略。一种解决方案是添加芳族烃以增加辛烷值。但是，这种辛烷值的等级低于铅汽油所期望的。另一种方法是生产不会引起预先设置的引擎。此外，汽车制造公司以更好的燃油燃烧技术生产发动机。具有催化转化器的汽车就是一个例子，这些汽车使用无铅汽油。
What is Super Unleaded Petrol?
Super unleaded petrol has a minimum research octane number (RON) of 97-98. Therefore, the octane number is very high in this type of petrol even than the premium unleaded petrol. Although the pricing is very high, this petrol grade is remarkably efficient and productive.
In order to avoid problems, cars which have designs that are suitable to run in higher octane rating fuels, like super unleaded petrol, should not be filled with lower octane rating fuels.
无铅和超级无铅有什么区别？
Unleaded vs Super Unleaded |
|
| A form of petrol that has no added lead compounds. | Has no lead compounds and has a high octane rating than unleaded petrol. |
| RON Value | |
| Unleaded petrol has minimum RON 91. | The minimum RON is 97-98 for super unleaded petrol. |
| 价格 | |
| Less expensive compared to super unleaded petrol. | 与无铅汽油相比，非常昂贵。 |
| Performance | |
| 铅汽油的整体性能低于超级无铅汽油。 | The overall performance of super unleaded petrol is much higher than that of unleaded petrol. |
概括– Unleaded vs Super Unleaded
Lead compounds are added to petrol in order to decrease the knocking effect on engines. However, due to the toxic effects of these compounds, now they are not in use. Therefore, manufacturers have discovered different forms of petrol that have no lead compounds. The difference between unleaded and super unleaded petrol is that Unleaded petrol has minimum RON 91 whereas super unleaded petrol has minimum RON 97-98.
Reference:
1. “Unleaded Petrol and Pre-1986 Cars – Facts About Fuels.” RACQ.Available here
2. “Gasoline.” Wikipedia, Wikimedia Foundation, 14 May 2018.Available here
Image Courtesy:
1.’7822806770′ by Michael Coghlan(CC BY-SA 2.0)viaFlickr
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