基于横向射流的旋流燃烧器热声不稳定控制  

Controlling Thermoacoustic Instability in a Swirl Combustor Based on a Transverse Jet

作　　者：周昊[1] 李国能[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《燃烧科学与技术》2010年第3期204-209,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50576081);浙江省自然科学基金资助项目(R107532);新世纪优秀人才支持计划资助项目(NCET-07-0761);全国优秀博士学位论文作者专项资金资助项目(200747);浙江大学曹光彪高科技发展基金资助项目(2008RC001);中央高校基本科研业务费专项资金资助项目.

摘　　要：为研究横向射流控制旋流燃烧器内自激热声不稳定的机理,搭建了旋流燃烧器热声不稳定控制试验台架,分别采用了横向射流(JICF)和横向火焰射流(JFCF)研究了空气流率为1.333.3 mL/s、化学当量比为0.9、旋流强度为0.77时旋流燃烧器的热声不稳定控制作用.试验发现横向射流能够大幅度降低旋流燃烧器的热声不稳定强度,而且横向射流所占用的空气流率比例小.当横向射流空气流率比例XJICF为6%时,热声不稳定的有效压力振幅从1.712.Pa降到185.Pa,降低了89.2%.另外,横向射流的控制作用远远优于横向火焰射流,横向火焰射流需要在燃料流率比例XJFCF>50%,时才能获得大于32.5%的控制效果.An laboratory facility was built to study the controlling mechanism of self-excited thermoacoustic instabili-ty in a swirl combustor based on a transverse jet.Jet in cross-flow（JICF） and jet flame in cross-flow（JFCF） were em-ployed separately to control thermoacoustic instability in a swirl combustor with a swirl number SW of 0.77.The air flow rate QOX is 1 333.3 mL/s,and the equivalence ratio φ is 0.9.The experimental resualts revealed that the intensity of thermoacoustic instability inside the swirl combustor was greatly suppressed when JICF with low ratios of airflow rates XJICF was introduced.When XJICF=6%,the effective amplitude of thermoacoustic instability decreased by 89.2% from 1 712 Pa to 185 Pa.Besides,JICF was found to be much more effective in controlling thermoacousticinstability than JFCF,and the latter can only achieve a controlling effect of 32.5% on condition that the ratio of fuel flow rate XJFCF should be greater than 50%.

关 键 词：旋流流动 热声不稳定 横向射流 

分 类 号：TF055[冶金工程—冶金物理化学]