Patent ID: 11859561
Assignee: PRATT & WHITNEY CANADA CORP.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 4:
5. The method of claim 1, comprising:
receiving, at the computing device, a speed of a fan of the aircraft engine; and
determining, at the computing device, a discharge pressure of air discharged from a compressor of the aircraft engine;
wherein determining the mass air flow includes:
determining the mass air flow based on an overall pressure ratio defined as the discharge pressure over the first inlet total air pressure;
concurrently with determining the mass air flow based on the overall pressure ratio, determining the mass air flow based on the speed of the fan; and
using the mass air flow from the speed of the fan to determine the Mach number if the mass air flow from the overall pressure ratio is unavailable.