What is the primary purpose of fuel heaters in turbine engine fuel systems?

The primary purpose of fuel heaters in turbine engine fuel systems is to prevent ice crystals from clogging system filters. This is particularly important because at high altitudes, fuel temperatures can drop significantly, leading to condensation and the formation of ice. If ice crystals form, they can become lodged in the filters, leading to fuel flow restrictions or complete blockage.

By heating the fuel before it reaches the filters, fuel heaters ensure that any water present in the fuel remains in a liquid state, preventing it from freezing and causing operational issues. This is critical for maintaining reliable engine operation and ensuring that fuel delivery remains uninterrupted, especially during high-demand conditions or in colder environments.

The other options relate to fuel system operations but do not encompass the primary role of fuel heaters. Increasing the fuel temperature before combustion, stabilizing fuel pressure, and enhancing fuel flow rate are important aspects of fuel management; however, they are secondary considerations compared to the critical need to prevent ice formation and ensure filter functionality.