System and method for direct non-intrusive measurement of corrected airflow

A sensor system for measuring a physical gas flow value WPhysical of a gas flowing through a duct of a gas turbine engine and for calculating a corrected gas flow value WCorr from WPhysical, the sensor system comprising:

• a laser-based sensor affixed to an interior of the duct, wherein the laser-based sensor measures a static temperature T, a gas density ρ, and a velocity v of the gas in said interior of said duct;
• means for obtaining a standard day-value temperature T0 and a standard day-value pressure P0;
• and
• a processor coupled to the laser-based sensor for controlling operation of the sensor, receiving signal information from the sensor, and calculating WPhysical and WCorr, wherein WCorr is calculated from the measured physical gas flow value, the static temperature T, the gas density ρ, the velocity v of the gas in said interior of said duct, the standard day-value temperature T0, and the standard day-value pressure P0.

A method of generating a corrected gas flow value from a physical gas flow value for a gas moving through a duct, the method comprising the steps of:

• applying a laser-based sensor to an interior of the duct;
• measuring the physical gas flow value WPhysical of the gas, a gas density ρ, and a velocity v of the gas in said interior of said duct with said laser-based sensor;
• measuring with a conventional sensor system a stagnation temperature TT;
• obtaining a standard day-value temperature T0 and a standard day-value pressure P0;
• and
• calculating the corrected gas flow value WCorr from the measured physical gas flow value, the gas density ρ, the velocity v of the gas in said interior of said duct, the stagnation temperature TT, the standard day-value temperature T0 and the standard day-value pressure P0.

A sensor system for measuring a physical gas flow value WPhysical of a gas flowing through a duct of a gas turbine engine and for calculating a corrected gas flow value WCorr from WPhysical, the sensor system comprising:

• a laser-based sensor affixed to an interior of the duct, wherein the laser-based sensor measures the physical gas flow value WPhysical of the gas, a gas density ρ, and a velocity v of the gas in said interior of said duct with said laser-based sensor;
• a conventional sensor system for measuring a stagnation temperature TT;
• means for obtaining a standard day-value temperature T0 and a standard day-value pressure P0;
• and
• a processor coupled to the laser-based sensor for controlling operation of the sensor, receiving signal information from the sensor, and calculating WPhysical and WCorr, wherein WCorr is calculated from the measured physical gas flow value, the gas density ρ, the velocity v of the gas in said interior of said duct, the stagnation temperature TT, the standard day-value temperature T0 and the standard day-value pressure P0.