Active Instability Control of Thermoacoustic Oscillation in Premixed Gas Turbine Combustors

• Published in: JSME International Journal Series B Fluids and Thermal Engineering Vol. 48; no. 2; pp. 328 - 333
• Main Authors: SATO, Hiroyuki, IKAME, Masaru, HARUMI, Kazuyoshi, KISHI, Takeyuki, HIRAOKA, Katsuhide, OKA, Hideyuki, HAYASHI, A. Koichi, OGAWA, Satoru
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Tokyo The Japan Society of Mechanical Engineers 2005; Japan Society of Mechanical Engineers; Japan Science and Technology Agency
• Subjects: Applied sciences; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Gas Turbine; Noise; Oscillating Combustion; Premixed Combustion; Swirl; Pressure fluctuation; Noise; Control system; Oscillating Combustion; Premixed flame; Premixed Combustion; Experimental study; Pollutant emission; Combustion chamber; Active system; Test facility; Swirl; Thermoacoustic effect; Gas turbine
• ISSN: 1340-8054; 1347-5371
• DOI: 10.1299/jsmeb.48.328

In this investigation, experimental results on combustion control systems to suppress the pressure oscillation and combustion noise were indicated using laboratory scale rigs of premixed gas turbine combustors. As for the way of controlling, two different control approaches were examined. One was a thermoacoustic approach using minute secondary flames. The control system had a simple time-delay algorithm and equipped a microphone as a sensor. The minute secondary flames as an actuator were formed with pulsing supply of the secondary fuel using a piezo valve. The other was a fluid mechanical approach using a secondary injection method. In that case, both fuel and air injections as the secondary jet from the center of nozzle were examined to clarify the control factor to reduce the pressure oscillation and NOx emissions. As the results, combustion noise caused by pressure oscillation was reduced successfully with the suppression of about 10dB by the thermoacoustic approach. Furthermore, it was found that secondary air injection was effective to suppress the NOx emissions based on thermal NO.