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Experimental Study on the Thermoacoustic Instability and Passive Control of Thermoacouxtic Instability in Swirl Combustor

Author: LiShiYu
Tutor: ZhouZuo
School: Zhejiang University
Course: Thermal Power Engineering
Keywords: Thermoacoustic instability Swirl burner Passive control
CLC: TK477
Type: Master's thesis
Year: 2008
Downloads: 59
Quote: 1
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Abstract


With the improvement of the environmental protection requirements , lean premixed gas turbine is widely used in industrial production , accompanied by thermal acoustic vibrations frequent appearance of , large amplitude thermoacoustic vibration causes the gas turbine performance and NOx emissions increase even cause damage on the gas turbine structure . The thermoacoustic instability characteristics of the swirl -type passive control of the pilot study . Firstly thermoacoustic phenomenon and its theoretical elaboration , Research reviews the thermoacoustic vibration control . Thermoacoustic vibration control mechanism , and a brief introduction about the thermoacoustic vibration control through a simple system model . Drawing on the basis of previous studies to design structures cyclone thermoacoustic test bench , including swirl burner , fuel control system , temperature measurement system and pressure measurement system . In this test system , the thermoacoustic instability characteristics of the swirl burner test research . By changing the stoichiometric ratio and the swirl strength , the temperature and pressure of the thermal acoustic vibrations , temperature, pressure, and frequency of the thermal acoustic vibrations with the trend of the individual parameters . The test results show that the stoichiometric and cyclone intensity influence on the the swirl burner temperature field and thermoacoustic instability strength , while the frequency of the first order , and second and third order frequency has little effect . The center jet thermoacoustic passive vibration control research , the study found that the center of the jet can significantly affect the dynamics swirl combustion core area . Reached when 15% of the total air volume flow rate of the central jet , can significantly reduce the amplitude of the thermal acoustic vibrations . The center jet velocity are important parameters that affect the central jet to change the dynamic characteristics cyclone core area . At the same time we were instead of dc wind Center wind comparative pilot study found that the decline in the thermoacoustic vibration amplitude is the role of the central jet , rather than the result of cyclone strength decreased .

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Gas turbine ( gas turbine ) > Run test
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