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Tuesday, 30 December 2014

Properties of Liquid Fuels

Properties of Liquid Fuels Points : Properties of Liquid Fuels 1. Calorific value of fuels Calorific value of a fuel is defined as quantity of heat energy released while unit mass of fuel is blistered totally in enough air. Fuels contain hydrogen contain two calorific values, higher or gross calorific value (HVV) and lesser or net calorific value (LCV). The common values for higher calorific value of several liquid fuels are given.
Calorific Value of Fuels
Fuel
Higher Calorific Value
1.Ethyle alcohol24
2.Methyl alcohol29
3.Benzole40
4.Diesel45
5.Kerosene46
6.Petrol47
2. Cetane number A main property of diesel fuel for utilize in high-speed compression-ignition engines is its sell-ignition excellence. This is governed through the cetane number: the higher centane number (60—70) the more proper is fuel for compression-ignition engines. 3. Ignition temperature Ignition temperature of a fuel is define as lowly temperature at which fuel will self ignite, that is with no the help of a flame or spark. Ignition temperature must be high for petrol engines and lesser for diesel engines. 4. Flash point Flash point of a fuel is defined as lowest temperature at which combustible vapour is given of with the fuel to ignite while a flame is applied to it. Petrol has a quite low flash point and must always be treated by the maximum quantity of care. 5. Octane number Octane number is the term functional to petrol and it is a measure of their propensity to oppose detonation or pinking. High-octane fuels oppose explosion extremely strongly and are required for use by modern high compression ratio engines, while low octane fuels explode simply at low compression ratios.

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