Regan Brown
Jet fuel and diesel are both petroleum-based fuels with similar compositions, but they have distinct characteristics and applications. Jet fuel, also known as aviation turbine fuel (ATF) or avtur, is specifically designed for aircraft with gas-turbine engines. It is a mixture of hydrocarbons, primarily kerosene, and naphtha, which burn at different temperatures, resulting in varying burning temperatures for jet fuel. On the other hand, diesel is composed of multiple hydrocarbons and other compounds, and its composition can vary depending on the source. This raises the question: which of these two fuels burns hotter? Understanding their unique properties and behaviour under combustion will provide insight into their relative heat output.
| Characteristics | Values |
|---|---|
| Burning temperature of diesel | Not found in sources |
| Burning temperature of jet fuel | 800 to 2500°F; up to 3000°F |
| Diesel composition | Many different hydrocarbons, including heptane and hexadecane, sulfuric acid esters, and other compounds |
| Jet fuel composition | Hydrocarbons kerosene and naphtha; other petroleum-based fuels |
| Diesel flash point | 55°C |
| Jet fuel flash point | 115°F (46°C); 300°F (149°C) for Jet A; 500°F (260°C) for Jet B |
| Diesel viscosity | Not found in sources |
| Jet fuel viscosity | Higher than petrol or kerosene |
| Diesel lubricity | Better than jet fuel |
| Jet fuel lubricity | Poorer than diesel |
| Diesel advantages | More fuel-efficient than avgas; higher flash point than jet fuel |
| Jet fuel advantages | Higher octane rating than petrol or kerosene; burns more efficiently in aircraft engines, resulting in better performance and fewer pollutants |
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What You'll Learn
Jet fuel is a mixture of hydrocarbons, kerosene and naphtha
Jet fuel is a mixture of hydrocarbons, kerosene, and naphtha. It is derived from crude oil and natural gas and is used to power aircraft engines. The performance of jet fuel is defined by its specifications rather than its chemical composition, which can vary depending on its source. Kerosene-type jet fuel, including Jet A and Jet A-1, has a carbon number distribution between 8 and 16, while wide-cut or naphtha-type jet fuel, including Jet B and JP-4, has a carbon number distribution between 5 and 15.
Kerosene-based jet fuel, also known as Jet A, is a common type of jet fuel that has a similar composition to commercial kerosene. However, aviation kerosene is produced under more stringent specifications. It is a complex mixture of 260+ aliphatic and aromatic hydrocarbon compounds, including toxicants such as benzene, n-hexane, toluene, xylenes, trimethylpentane, and methoxyethanol. The concentration of these compounds can vary depending on the source of crude oil.
Naphtha-type jet fuel, also known as Jet B, is a blend of approximately 30% kerosene and 70% gasoline. It has a very low freezing point of −60 °C (−76 °F) and a low flash point, making it more dangerous to handle. For this reason, it is rarely used except in very cold climates, such as northern Canada and Alaska.
The burning temperature of jet fuel depends on the ratio of kerosene to naphtha in the mixture. Kerosene burns at a higher temperature than naphtha, so the proportion of kerosene in the mixture will result in a higher burning temperature. Jet fuel typically burns at temperatures between 800 and 2500 degrees Fahrenheit, with the potential to reach up to 3000°F (1661°C) under certain conditions.
In comparison to diesel, jet fuel has a lower energy density and burns at a lower temperature. Diesel is composed of various hydrocarbons and other compounds, and its exact composition can vary depending on its source. However, it generally has a higher energy density and burns at a higher temperature than jet fuel.
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Diesel is composed of many hydrocarbons, heptane, hexadecane and other compounds
Diesel is a complex mixture of hydrocarbon molecules, derived from crude oil through fractional distillation. It consists of aliphatic and aromatic hydrocarbons, with a boiling point range of approximately 150°C to 380°C. The composition of diesel varies depending on its source, but it typically includes many different hydrocarbons, such as heptane, hexadecane, alkanes, cycloalkanes, and aromatics. These hydrocarbons have a significant impact on the distillation process due to their lower and constant boiling temperatures.
Heptane, for example, has a boiling point of 98.5°C, which influences the distillation characteristics of the blended fuels. The addition of n-heptane and n-dodecane to diesel fuel can reduce fuel consumption. However, n-heptane also increases HC and NOx emissions significantly. On the other hand, n-dodecane slightly increases CO, HC, and NOx emissions.
Hexadecane is another important hydrocarbon component of diesel fuel. It falls within the range of hydrocarbons used in fuel oils, which typically contain between 15 and 18 carbon atoms per molecule. These hydrocarbons are essential for the functionality of diesel fuel, contributing to its energy density and combustion characteristics.
Other compounds found in diesel include non-hydrocarbon compounds like dibenzothiophene (a sulfur compound) and carbazole (a nitrogen compound). These compounds are formed when small amounts of sulfur, nitrogen, and oxygen (known as heteroatoms) bind with carbon and hydrogen molecules. Additionally, diesel fuel may contain additives similar to those in gasoline, such as nitrogenous detergents and dispersants.
The wide range of hydrocarbons and other compounds present in diesel fuel contributes to its complex nature. This complexity makes it challenging to simulate and understand the behaviour of diesel in combustion engines. However, the specific composition of these compounds influences the physical and ignition properties of diesel, ultimately affecting engine performance and combustion characteristics.
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Jet fuel burns at 800 to 2500 degrees Fahrenheit
Jet fuel burns at temperatures between 800 and 2500 degrees Fahrenheit, with some sources giving a lower range of 800 to 1500 degrees Fahrenheit. It is important to note that the exact burning temperature of jet fuel depends on its specific composition, particularly the ratio of its two main hydrocarbons: kerosene and naphtha. Kerosene burns at a higher temperature than naphtha, so a higher proportion of kerosene in the mixture will result in jet fuel that burns at a higher temperature.
The burning temperature of jet fuel also depends on various additives used during production. These additives can affect the viscosity and combustion efficiency of the fuel, influencing the burning temperature. Additionally, jet fuel is highly sensitive to temperature, with optimal burning conditions requiring specific temperature ranges and pressures.
While jet fuel has a high burning temperature, it is not sufficient to melt steel, which has a melting point of around 2750 degrees Fahrenheit. However, jet fuel can weaken the structural integrity of steel structures by reducing their strength at lower temperatures. This was evident in the collapse of the World Trade Center towers during the September 11, 2001, attacks, where jet fuel burning at temperatures between 800 and 1500 degrees Fahrenheit ignited fires that compromised the structural integrity of the buildings.
When comparing jet fuel to diesel, it is generally agreed that diesel burns at a higher temperature than jet fuel due to its higher energy density. Diesel is composed of various hydrocarbons and compounds, resulting in a higher energy output per unit mass compared to jet fuel. However, during the early testing days of jet engines, diesel was considered as a potential fuel due to its higher flash point, which is the temperature at which the vapors above the liquid fuel catch fire when exposed to a flame or spark.
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Diesel burns hotter due to higher energy density
Diesel burns hotter than jet fuel due to its higher energy density, which means it has more energy per unit mass. The composition of diesel varies depending on its source, but it typically contains multiple hydrocarbons, including heptane and hexadecane, as well as compounds like sulfuric acid esters. This variety in composition can lead to fluctuations in its burning temperature. However, its higher energy density consistently results in greater heat generation compared to jet fuel.
Jet fuel, on the other hand, is primarily composed of two hydrocarbons: kerosene and naphtha. Kerosene burns at a higher temperature than naphtha, and the ratio of these two hydrocarbons in jet fuel determines its burning temperature. While jet fuel can reach extremely high temperatures, typically ranging from 800 to 2500 degrees Fahrenheit, it does not surpass the heat generated by diesel.
The higher energy density of diesel translates into more energy produced per unit mass. This efficiency advantage is particularly notable when comparing diesel to jet fuel. Jet fuel has a lower flash point, which is the temperature at which the vapor above the liquid fuel ignites when exposed to a flame or spark. Jet fuel's higher viscosity further contributes to its lower energy density.
The combustion chamber of a jet engine, where the fuel and air mixture ignite, can reach temperatures of up to 2000°C (3727°F) during combustion. While these temperatures are exceptionally high, they are still lower than the heat generated by diesel fuel. The combustion process in jet engines is highly efficient, with faster combustion and increased power output. However, diesel's higher energy density enables it to surpass jet fuel in terms of heat generation.
In summary, diesel burns hotter than jet fuel due to its higher energy density. The varying compositions of diesel and jet fuel contribute to their distinct burning characteristics. The combustion processes and applications of these fuels also differ, with jet fuel being specifically designed for aircraft engines, while diesel has a broader range of uses.
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Jet fuel is harder to ignite in an engine
While jet fuel burns at a high temperature, it is harder to ignite in an engine than other fuels. Jet fuel is a mixture of hydrocarbons, including kerosene and naphtha, which have different burning temperatures. The ratio of these two hydrocarbons determines the burning temperature of jet fuel, which can be as high as 3,000°F (1,661°C).
Jet fuel has a higher flashpoint than other fuels, which is the reason it doesn't catch fire easily. Flashpoint refers to the lowest temperature at which a liquid will ignite and burn when exposed to heat or flame. Jet fuel has a flashpoint of about 115°F (46°C), while gasoline has a flashpoint of -40°F (-40°C). This means that jet fuel won't ignite until it gets much warmer than other fuels.
Additionally, jet fuel contains additives that make it harder to ignite. These additives form a gel-like substance called an emulsion when they come into contact with water or moisture from the atmosphere. The emulsion acts as a barrier between the flame and the rest of the fuel, making it less likely to burn. These additives are necessary for military aircraft and engine fuel systems and can improve the safety and reliability of flight.
The development of jet fuel specifications focused on finding a fuel with a higher flash point that didn't vaporize easily. This was important because jet engines burn fuel under steady-state conditions, and the high octane properties of aviation gasoline (Avgas) were no longer needed. Jet fuel's higher flash point makes it safer to transport and handle than other fuels.
Overall, while jet fuel burns at high temperatures, it is harder to ignite in an engine due to its higher flashpoint and the presence of additives that form a protective emulsion. These characteristics make jet fuel a safer choice for aviation fuel.
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