Method and apparatus for acceleration limiting a gas turbine...

Details Method and apparatus for acceleration limiting a gas turbine... Method and apparatus for acceleration limiting a gas turbine...

F - Mech Eng,Light,Heat,Weapons

02

C

60/125, 60/140,

F02C 9/26 (2006.01) F02C 9/28 (2006.01)

Patent

CA 1177264

ABSTRACT A method and apparatus for acceleration limiting a gas turbine engine (10) is disclosed. A proportional fuel control (11) regulates the fuel flow Wf from a hydromechanical unit (36) based upon an error signal E representing the difference between a demanded speed signal Nd and an actual speed signal Ng. The demanded speed signal Nd is generated by an integrator (32) as the time integral of the difference between the demanded signal Id and a scheduled speed signal Ngs. Additionally, the difference signal is limited between an upper limit Al and a lower limit D1 prior to the integration by a comparator (28) and a limiter circuit (30). The acceleration limit, Al is generated as a function of a nondimensional parameter ratio (dN/dt X N)/Wf. (Figure 1)

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