不同台阶高度对中心分级燃烧室点火熄火性能的影响

Effect of different step heights on ignition and blowout performance of internally-staged combustor

设计了一种贫油燃烧中心分级燃烧室,采用单头部矩形试验件,试验研究了3种不同台阶高度对点火熄火性能的影响.试验中只有预燃级喷嘴供油工作,在常温常压、常温低压条件下进行了贫油点火试验,在常温常压、加温常压下进行了贫油熄火试验.结果表明：台阶高度越大,贫油点火边界越宽,同时贫油熄火边界越宽;进口温度的升高有助于改善贫油熄火性能,并缩小3种方案贫油熄火油气比的差距,在320~570K的进口温度范围内,贫油熄火油气比的最大差距由40%减小到13%;3种方案都具有较好的常温负压点火性能,且在0.5%~1.5%的火焰筒进出口总压降下,贫油点火油气比差异不大,最大相差不超过10%.

A lean-burn internally-staged combustor was designed.Using a single module rectangular test article,the effects of three different step heights on ignition and blowout performance were studied herein.Only the pilot stage nozzle was fueled in the tests.The lean ignition test was operated with normal and negative inlet pressures under normal inlet temperatures condition,and the lean blowout test was operated with the normal and raised inlet temperature under the normal inlet pressure condition.The experimental results indicate that the lean ignition and blowout boundaries are simultaneously widened with the increasing the step height;the inlet temperature rise is good for lean blowout performance with narrowing the lean blowout fuel air ratio differences in these three cases,and the maximum differences decrease from 40%to 13%under the test condition of the inlet temperature of 320-570K;the ignition performance under the negative inlet pressure and normal inlet temperature condition is rather good for all three cases with little difference of the lean ignition fuel air ratio,and the maximum differences don＇t exceed 10% under the test condition of the liner total pressure drop of 0.5%-1.5%.