Abstract:

In order to prevent possible errors in the pressure-sensing element signals caused by water vapor condensation inside the PSS of the LEAP-1A engine, which will affect engine control and flight safety, an anti-icing retrofit study of the PSS was conducted by simulation. By establishing the finite element model of the PSS and combining the real flight data, the icing conditions inside the casing under different operating conditions were explored. Failure modes and severity caused by system icing were analyzed, and failure warning modes for the PSS were studied. On this basis, the anti-icing retrofit scheme of the PSS was designed, and the anti-icing simulation and verification methods were proposed. The test results were used to verify the criterion. The results show that the retrofit scheme based on pressure manifold differential pressure-controlled heating will effectively avoid the failure caused by icing in the PSS, and the value of pressure difference provides a criterion for prototype tests.

Key words: pressure-sensing subsystem (PSS), failure mode, finite element model, fault warning, Ansys