This law tells us that pressure is inversely related to temperature. In other words, if we raise the pressure, then we also raise the temperature so that the equation P/T remains a constant. In diesel engines, the pressure is increased to the point that temperature rises above the combustion point of the fuel, causing ignition. That is to say, no spark is needed in a diesel engine. A standard petrol engine usually has a compression ratio of about 10:1. A diesel engine will have a compression ratio that ranges from 14:1 to 18:1.
So, cetane rating tells us how well a fuel burns under the conditions found in a diesel engine and can basically be thought of as a quality rating. The rating is based off of an alkane called cetane, which has the formula C16H24. With this fuel, the time between fuel being injected into the cylinder and ignition is 2.407 milliseconds, which gets a cetane rating of 100. The longer ignition takes, the lower the cetane number will be.
Cetane number is not the only property of biodiesel that is of interest. Biodiesel is liquid, usually yellow to dark brown, and has a high boiling point. Of most importance, biodiesel has no sulfur content.
Of note, diesel engines do not use lubricant. Instead, they rely on the fuel, which is more oil-like than gasoline, to lubricate the pistons and reduce friction with the cylinder wall. Biodiesel is a better lubricant than low-sulfur diesel, though not quite as good as standard diesel (which is being phased out due to pollution).
This law tells us that pressure is inversely related to temperature. In other words, if we raise the pressure, then we also raise the temperature so that the equation P/T remains a constant. In diesel engines, the pressure is increased to the point that temperature rises above the combustion point of the fuel, causing ignition. That is to say, no spark is needed in a diesel engine. A standard petrol engine usually has a compression ratio of about 10:1. A diesel engine will have a compression ratio that ranges from 14:1 to 18:1.So, cetane rating tells us how well a fuel burns under the conditions found in a diesel engine and can basically be thought of as a quality rating. The rating is based off of an alkane called cetane, which has the formula C16H24. With this fuel, the time between fuel being injected into the cylinder and ignition is 2.407 milliseconds, which gets a cetane rating of 100. The longer ignition takes, the lower the cetane number will be.Cetane number is not the only property of biodiesel that is of interest. Biodiesel is liquid, usually yellow to dark brown, and has a high boiling point. Of most importance, biodiesel has no sulfur content.Of note, diesel engines do not use lubricant. Instead, they rely on the fuel, which is more oil-like than gasoline, to lubricate the pistons and reduce friction with the cylinder wall. Biodiesel is a better lubricant than low-sulfur diesel, though not quite as good as standard diesel (which is being phased out due to pollution).
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