In-Line Electromagnetic Actuator for Fuel Modulation

Okojie, Robert S ; Chang, Carl W ; Meredith, Roger D ; Thomas, Randy ; Kopasakis, George

关键词: ACTUATORS;    COMBUSTION CHAMBERS;    ELECTROMAGNETS;    ELECTRIC POTENTIAL;    INLET PRESSURE;    MODULATION;    ACOUSTIC INSTABILITY;    DIFFERENTIAL PRESSURE;    MODULATORS;    OPTICAL MEASURING INSTRUMENTS;    PLUNGERS;    TETHERING;   

RP-ID  :  GRC-E-DAA-TN58839

学科分类：航空航天科学

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来源: NASA Technical Reports Server

【 摘 要 】

An in-line electromagnetic actuator with normally-open configuration has been developed for the purpose of exploring its application as a fuel modulator for the active control of combustor thermo-acoustic instabilities. The actuator is based on the spring-coil-plunger mechanism with the plunger designed to be suspended by crossed cantilever beam springs. Operational specification was set for a 1000 psi maximum inlet fuel pressure and modulation for a broad frequency bandwidth that encompasses frequencies that are typically associated with combustor thermo-acoustic instabilities. Various test results demonstrated fuel modulation up to 1200 Hz for coil excitation voltage between 2.3 and 4.6 V and current between 16 and 48 mA, respectively. The initial goal of this work was to demonstrate fuel modulation based on the concept of a normally-open fuel modulator with tethered plunger displacement.