초록 ▼

A gas turbine engine (12) wherein combustion conditions are controlled as a function of the humidity of the ambient air (36) in order to ensure stable, emission-compliant performance over a range of ambient conditions. The pilot fuel fraction supplied to a dual mode combustor (10) may be controlled

A gas turbine engine (12) wherein combustion conditions are controlled as a function of the humidity of the ambient air (36) in order to ensure stable, emission-compliant performance over a range of ambient conditions. The pilot fuel fraction supplied to a dual mode combustor (10) may be controlled to be responsive to the relative humidity or the specific humidity of the ambient air. Humidity may be measured directly or it may be calculated as a function of other temperature and pressure measurements. A fuel system (44) is controlled by a controller (46) having as inputs the signals from one or more of a relative humidity sensor (62), a barometric pressure sensor (56), a wet bulb temperature sensor (58) and a dry bulb temperature sensor (60).

대표청구항 ▼

1. A method of controlling a dual-mode gas turbine combustor having a pre-mixed combustion zone and a pilot diffusion combustion zone, pilot fuel fraction being defined as a ratio of a fuel flow rate to the pilot diffusion combustion zone divided by a sum of the fuel flow rate to the pilot diffusion

1. A method of controlling a dual-mode gas turbine combustor having a pre-mixed combustion zone and a pilot diffusion combustion zone, pilot fuel fraction being defined as a ratio of a fuel flow rate to the pilot diffusion combustion zone divided by a sum of the fuel flow rate to the pilot diffusion combustion zone plus a fuel flow rate to the pre-mixed combustion zone, the method comprising controlling the pilot fuel fraction as a function of a level of humidity of ambient air used for combustion in the combustor. 2. The method of claim 1, further comprising controlling the pilot fuel fraction in response to a measurement of relative humidity of the ambient air. 3. The method of claim 1, further comprising controlling the pilot fuel fraction in response to a measurement of relative humidity of the ambient air and further in response to a measurement of temperature of the ambient air. 4. The method of claim 1, further comprising controlling the pilot fuel fraction as a function of specific humidity of the ambient air. 5. The method of claim 4, further comprising controlling the pilot fuel fraction in response to respective measurements of dry bulb temperature, relative humidity and barometric pressure of the ambient air. 6. The method of claim 4, further comprising calculating a specific humidity value (ω, lbs. water vapor/lbs. dry air) as a function of ambient dry bulb temperature (Tdb,° F.), relative humidity (φ, %) and barometric pressure (Patm,psi) by calculating: Pg=14.504×105.9364-(2216.53+0.5555×(Tdb+459.67)) Pv=(φ+100)×Pg ω=Pv+[1.608×(Patm-Pv)]. 7. The method of claim 4, further comprising controlling the pilot fuel traction in response to respective measurements of dry bulb temperature, wet bulb temperature and barometric pressure of the ambient air. 8. The method of claim 4, further comprising calculating a specific humidity value (ω, lbs. water vapor/lbs. dry air) as a function of ambient dry bulb temperature (Tdb,° F.), ambient wet bulb temperature (Twb,° F.), and barometric pressure (Patm,psi) by calculating: P=Patm×2.0359 Pdb=(4.413×1011)Tdb5+(4.5224×1010)Tdb4+8.6346×107)Tdb3+(2.9593×105)Tdb2+2.4521 Tdb+0.041414 Pwb=(4.413×1011)Twb5+(4.5224×1010)Twb4+8.6340×107)Twb3+(2.9593×105)Twb2+2.4521 Twb+0.041414 Pact=Pwb+(Tdb+Twb)(Pwb-P)×[1+0.15577(Pwb/P)]/(2829.454767-1.47359696 Tdb)