Fuel circuit for jet engine of airplane, has control units whose input pressures depend on input pressure of re-circulation loop, and strangulation unit placed in re-circulation loop, and creating fuel passage section reduction

摘要

The circuit has a flow metering unit (219) for controlling flow of fuel injected in a combustion chamber (220) of a turbomachine via while sending back excess of fuel in a main circuit (212) upstream of a high pressure pump (218) via a re-circulation loop (221). Input pressures (Pe) of electrohydraulic control units e.g. servovalves (S1, S2) depend on input pressure (Pr) of the re-circulation loop for certain operating speeds of the turbomachine. A strangulation unit e.g. Venturi (260), is placed in the re-circulation loop, and creates fuel passage section reduction.