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%.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
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.
关键词
旋流流动
热声不稳定
横向射流
swirl flow
thermoacoustic instability
transverse jet
