ACTIVE CONTROL OF COMBUSTION INSTABILITY IN FUEL INJECTOR AND COKE REMOVING DEVICE

摘要

PROBLEM TO BE SOLVED: To efficiently decoke an injector by providing a voltage feedback generating means for processing and controlling the signal of a detector for measuring the pressure fluctuation of a combustion chamber, and a piezoelectric device for generating the pulsation of a fuel flow rate in the outlet of the injector on a fuel supply hydraulic line. SOLUTION: A detector 50 is provided to detect the degree of pressure instability in a combustion chamber 51, a piezoelectric device 53 is provided on a fuel supply line to the combustion chamber 51, and these are connected to a feedback generating means 52. Since this generating means 52 generates a signal corresponding to pressure fluctuation in the combustion chamber 51, a filtering means 55 is provided for the static component of a measuring signal, pressure fluctuation with respect to a set value is calculated by a comparing means 56, and a control voltage for reducing the pressure fluctuation is generated by an electronic device 57 and outputted to the piezoelectric device 53. The electronic device 57 changes the amplitude of a voltage so as to optimize the frequency of a voltage applied to the piezoelectric device 57 and a necessary output.