What type of fuel is primarily used in turbine engines?

The primary fuel used in turbine engines is jet fuel, specifically types such as Jet A and Jet A-1. Jet fuel is a kerosene-based fuel that has a high flash point and is designed to meet the stringent requirements for performance and safety in aviation.

Jet fuel's composition allows for efficient combustion in turbine engines, which operate at high temperatures and pressures. This fuel is specifically formulated to maintain stable combustion characteristics and to provide the energy density necessary to power aircraft, especially at the high altitudes and speeds at which turbine engines operate.

In contrast, AVGAS is used in piston engines and is not suitable for turbine engines. Diesel fuel is primarily used in compression-ignition engines, while biofuels, though gaining popularity in some aviation contexts, are not the primary choice for turbine engines at this time, with jet fuel being the widely accepted standard due to its established use and reliability.