Katerina Swanson
The most common type of jet fuel, Jet-A, is made from kerosene and is similar to diesel fuel. Jet fuel is defined by its performance specifications, such as its freezing and flash points, rather than its chemical composition. Kerosene-based jet fuel has been in use since World War II and is favored due to its higher flash point and freezing point compared to standard kerosene. Turbine engines, like those found in jets, can operate with a wide range of fuels, but gasoline is not suitable due to its low boiling point, which could interfere with the operation of fueldraulic parts. Diesel fuel is also not used in jet engines due to its viscosity, which could cause it to solidify at high altitudes.
| Characteristics | Values |
|---|---|
| Jet fuel | Kerosene-based, clear or straw-coloured liquid |
| Jet fuel vs. gasoline | Jet fuel is denser, has a higher flashpoint and a lower freezing point |
| Jet fuel vs. diesel | Jet fuel has a higher flashpoint, lower freezing point, and lower lubricating power |
| Jet fuel types | Jet A, Jet A-1, Jet B, JP-4, JP-5, JP-8 |
| Jet A | Used primarily in the US, heavier than standard kerosene, freezing point of -40° C |
| Jet A-1 | Most used jet fuel worldwide, freezing point of -47° C |
| Jet B | A naphtha-kerosene fuel, rarely used due to safety concerns, freezing point of -60° C to -76° C |
| Kerosene | Less viscous than diesel, safer due to lower volatility, can be used in diesel engines |
| Diesel | Viscous, can solidify at high altitudes, can be used in jet engines but is not due to potential for solidification |
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What You'll Learn
Jet fuel is a refined kerosene-based liquid
There are several types of jet fuel, including Jet A, Jet A-1, and Jet B. Jet A is primarily used in the United States and has a higher flash and freezing point than standard kerosene. Jet A-1 is the most commonly used jet fuel worldwide and has an even lower freezing point, making it suitable for international travel. Jet B is a naphtha-kerosene blend with an extremely low freezing point, making it useful in cold climates. However, its lighter composition makes it more dangerous to handle, so it is rarely used outside of very cold regions like northern Canada and Alaska.
Jet fuel has a higher energy density than gasoline and is safer due to its higher flash point. Kerosene is also less viscous than diesel, making it the preferred choice for jet engines as it is less likely to solidify at high altitudes. Turbine engines can operate with a wide range of fuels, but jet fuel's performance characteristics make it the optimal choice.
The aviation industry is actively working to develop sustainable alternatives to jet fuel, such as biofuels and biokerosene made from algae or plant oils. These efforts are part of a broader push towards carbon neutrality by 2050.
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Jet fuel contains more sulfur than diesel
Jet fuel is a kerosene-based refined liquid that is used to power turbine engines, such as jet and turboprop engines. Jet fuel is defined by its performance specifications, such as its freezing point and smoke point, rather than by its chemical composition. Kerosene-type jet fuels include Jet A, Jet A-1, JP-5, and JP-8, which is also used in NATO diesel vehicles and by the US military.
The higher sulfur content of jet fuel has implications for its use in diesel-powered vehicles. Jet fuel is sometimes used in diesel-powered ground-support vehicles at airports, but its poor lubricating ability compared to diesel can increase wear on fuel injection equipment. An additive may be needed to improve the lubricity of jet fuel when used in diesel engines.
The process of removing sulfur from jet fuel through hydrodesulfurization can increase costs and lead to increased CO2 emissions. While ultra-low sulfur jet fuel could provide health benefits and reduce toxic particle emissions, it may also increase aviation-related climate warming due to the reduction of sulfate particles reflecting solar radiation into space.
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Jet fuel has a higher energy density than gasoline
Jet fuel is a refined kerosene-based liquid primarily used to power turbine engines. It is a high-quality fuel that is clear to straw-coloured and has a high flash point, making it safer to carry. Kerosene also has a higher octane rating than gasoline.
The use of kerosene in jet fuel dates back to World War II, when it was chosen for economic reasons. Kerosene was a leftover product of crude oil distillation that wasn't selling well due to the popularity of electricity. It was also chosen for its performance characteristics, such as a high flash point, which means it requires a significantly higher temperature to ignite, making it safer.
While jet fuel has a higher energy density than gasoline, other alternatives like hydrogen, ammonia, and sustainable aviation fuel are being explored. Hydrogen has the highest energy density by weight but requires aircraft redesign and solving other problems. Ammonia (NH3) has been suggested as an alternative for maritime shipping but has half the energy density of fossil fuels. Sustainable aviation fuel is another option that requires few modifications to aircraft.
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Jet fuel is not suitable for diesel-engine vehicles
Jet fuel is a kerosene-based refined liquid primarily used to power jet and turboprop engines. It is also known as Jet A, the most common type of jet fuel, and is similar to diesel fuel. However, jet fuel is not suitable for diesel-engine vehicles due to several reasons.
Firstly, jet fuel lacks some of the lubricants found in road diesel fuel. Lubricity is an important factor in the performance of diesel engines, and the lack of sufficient lubricants in jet fuel can lead to issues with the engine. This is a key reason why jet fuel is not recommended for diesel-engine vehicles.
Secondly, jet fuel has a lower lubricating power compared to diesel. While jet fuel contains more sulfur, which provides better lubricity, it is not as effective as the lubricants specifically designed for diesel engines. The lower lubricating power of jet fuel can impact the performance and longevity of diesel engines.
Additionally, jet fuel has a different flash point and freezing point compared to diesel fuel. Aviation fuels must meet strict requirements for flying characteristics, including a higher flash point and a lower freezing point. These characteristics are not optimal for diesel engines, which operate under different conditions. Using jet fuel in a diesel engine can affect the engine's performance and may not meet the required standards for diesel-engine vehicles.
Furthermore, jet fuel has a higher energy density than gasoline, both by weight and volume. This higher energy density is not suitable for diesel engines, which are designed to operate with specific fuel requirements. Using jet fuel in a diesel engine can impact fuel efficiency and may not provide the desired power output.
While some sources suggest that jet fuel can technically be used in diesel engines, it is not advisable due to the potential long-term damage it can cause. Jet fuel is designed for aviation purposes and has unique properties that are not compatible with the specific requirements of diesel-engine vehicles. Therefore, it is important to use the appropriate fuel type for each engine to ensure optimal performance, fuel efficiency, and longevity.
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Jet fuel is defined by performance specifications, not a chemical compound
Jet fuel is a mixture of various hydrocarbons. The exact composition varies based on the petroleum source, making it impossible to define jet fuel as a ratio of specific hydrocarbons. Hence, jet fuel is defined by performance specifications, not a chemical compound. The range of molecular mass between hydrocarbons (or different carbon numbers) depends on the requirements for the product, such as the freezing point or smoke point.
Kerosene-type jet fuel (including Jet A and Jet A-1, JP-5, and JP-8) has a carbon number distribution between about 8 and 16 (carbon atoms per molecule). Wide-cut or naphtha-type jet fuel (including Jet B and JP-4) has a carbon number distribution between about 5 and 15. Jet A fuel, primarily used in the United States, is heavier with a higher flash point and freezing point than standard kerosene. Jet A-1 is the most used jet fuel worldwide and has a lower freezing point (-47° C) than Jet A (-40° C), making it suitable for international travel through varying climates.
Jet B is a naphtha-kerosene fuel with enhanced cold-weather performance and a very low freezing point of −60 °C (−76 °F). However, its lighter composition makes it more dangerous to handle, so it is rarely used except in very cold climates like northern Canada and Alaska. Jet B is also known as wide-cut fuel, a blend of approximately 30% kerosene and 70% gasoline.
Fuel for piston-engine-powered aircraft, usually a high-octane gasoline known as avgas, has a high volatility to improve carburetion characteristics and a high autoignition temperature to prevent pre-ignition in high-compression aircraft engines. Turbine engines, like diesel engines, can operate with a wide range of fuels because the fuel is injected into the hot combustion chamber.
The push for sustainable aviation fuel, also known as aviation biofuel, has existed since before the 2016 Paris Agreement. As the emphasis on renewable energy increases, aviation may turn to hydrogen power and electric batteries for fueling systems.
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Frequently asked questions
Jet fuel is a refined kerosene-based liquid that is used to power turbine engines, such as jet and turboprop engines.
Jet fuel and diesel are similar in that they are both denser than gasoline and have a higher flash point and a lower freezing point. However, jet fuel contains more sulfur, giving it better lubricity. Diesel fuels are also rated in cetane, which is a measure of the fuel's ignition quality, while jet fuel is not.
Yes, jet fuel can theoretically be used in diesel engines. However, jet fuel lacks some of the lubricants found in road diesel fuel, so using jet fuel in a modern diesel engine could cause serious issues.
While jet engines can technically run on almost any flammable liquid, diesel is not typically used as jet fuel. This is because diesel is more viscous and could solidify at high altitudes. Kerosene, which is less viscous, is the preferred fuel for jet engines.
