摘要:
Bei einem Brennstoffverteilungssystem (25) für eine Gasturbine mit mehrstufiger Brenneranordnung zweigt von einer gemeinsamen Brennstoffzuführung (18) jeweils wenigstens eine Verteilleitung (19, 20, 21) ab und führt zu einer Brennerstufe (11, 12), wobei in jeder Verteilleitung (19, 20, 21) wenigstens ein Element (22, 26, 27) zur gezielten Beeinflussung des Brennstoffmassenstroms vorgesehen ist. Bei einem solchen Brennstoffverteilungssystem (25) wird eine vereinfachte Regelung dadurch ermöglicht, dass in einem Teil (19) der Verteilleitungen (19, 20, 21) als Element zur gezielten Beeinflussung des Brennstoffmassenstroms jeweils ein Kontrollventil (22) angeordnet ist, und dass in den übrigen Verteilleitungen (20, 21) als Element zur gezielten Beeinflussung des Brennstoffmassenstroms jeweils eine fest vorgegebene Blende (26, 27) angeordnet ist.
摘要:
A method of controlling combustion stability in a turbine engine having combustion stability control capability includes the steps of providing at least one pair of pulsating valves, mutually arranged in parallel with respect to fuel flow provided to a combustor of the turbine engine, detecting an amplitude and frequency of a pressure wave of at least one periodic combustion instability, selecting an amplitude, frequency and first phase shift, with respect to the pressure wave, of resultant fuel pulsations to reduce the amplitude of the pressure wave, translating the selected amplitude into a second, relative phase shift between each pulsating valve of at least one pair of pulsating valves, and commanding each pulsating valve of at least one pair of pulsating valves to operate at the selected frequency and a relative second phase shift with respect to one another, to yield a resultant fuel pulsation at the selected amplitude, frequency and first phase shift, with respect to the detected pressure wave of combustion instability.
摘要:
The invention relates to the use of electromagnetic fields for influencing combustion processes. According to the invention, the flame is controlled by the coupling of repeated, inductive, pulsed energy. The associated device uses at least one induction coil (11, 21) that at least partially surrounds the flame and said device is equipped with a controllable switch (16, 16') or a high frequency generator (26, 26').
摘要:
A sensor (11) detects the acoustic pressure at a first location in a combustion chamber (7) of a test rig I and produces an input signal which is a function of the acoustic pressure. A controller (13) which receives the input signal and produces an output signal which is a function of the input signal. An acoustic actuator (16-18) receives the output signal and introduces into the combustion chamber (7) at a second location an acoustic pressure which is a function of the output signal. The acoustic actuator may comprise a fuel injector (18) or a loudspeaker. By using an appropriate control algorithm, acoustic boundary conditions corresponding to a particular gas turbine combustion chamber may be produced, at least in a certain frequency range.
摘要:
An apparatus and method to sense the onset of combustion stability is presented. An electrode is positioned in a turbine combustion chamber such that the electrode is exposed to gases in the combustion chamber. The electrode may be integrated with an igniter. A control module applies a voltage potential to the electrode and detects a combustion ionization signal and determines if there is an oscillation in the combustion ionization signal indicative of the occurrence of combustion stability or the onset of combustion instability. The control module broadcasts a notice if the parameters indicate the combustion process is at the onset of combustion instability or broadcasts an alarm signal if the parameters indicate the combustion process is instable. Combustion parameters are adjusted to drive the combustion process towards stability.
摘要:
An apparatus and method to sense the onset of combustion stability is presented. An electrode is positioned in a turbine combustion chamber such that the electrode is exposed to gases in the combustion chamber. A control module applies a voltage potential to the electrode and detects a combustion ionization signal and determines if there is an oscillation in the combustion ionization signal indicative of the occurrence of combustion stability or the onset of combustion instability. A second electrode held in a coplanar but spaced apart manner by an insulating member from the electrode provides a combustion ionization signal to the control module when the first electrode fails. The control module broadcasts a notice if the parameters indicate the combustion process is at the onset of combustion instability or broadcasts an alarm signal if the parameters indicate the combustion process is unstable.
摘要:
Bei einem Verfahren zur Kontrolle von thermoakustischen Instabilitäten bzw. Schwingungen in einem Verbrennungssystem (15) werden mit den thermoakustischen Instabilitäten verknüpfte Druckschwingungen und/oder Wärmefreisetzungsschwingungen im Verbrennungssystem (15) gemessen, das resultierende Messsignal gefiltert, zeitlich verzögert und verstärkt, und nach Massgabe des gefilterten, verzögerten und verstärkten Messsignals der Brennstoffstrom zum oder die Verbrennungsluft für das Verbrennungssystem (15) moduliert. Bei einem solchen Verfahren wird der Einsatz kostengünstigerer Modulationseinrichtungen dadurch erreicht, dass die Modulation bei einer Subharmonischen einer dominanten Instabilitätsfrequenz im Verbrennungssystem (15) erfolgt.