不同喷管间距甲烷微火焰阵列温度场和燃尽特性研究

Study of temperature and burn-out characteristics of methane premixed microflame array combustor with different nozzle center distance

中文关键词: 微火焰  阵列火焰  温度均匀性  燃尽率  甲烷

英文关键词: micro combustion  array combustor  temperature uniformity  burn-out rate  methane  

中文摘要:

      为了优化微阵列火焰燃烧加热系统，本文在相同的燃料负荷和喷管物理条件下，构建了甲烷预混和微火焰阵列燃烧模型，并研究了不同喷管中心间距对温度场和燃尽率特性的影响规律。研究结果表明，由若干微小喷管火焰优化组成的阵列可形成温度均匀的加热场；随着喷管中心间距减小，火焰间相互影响程度增加，均温加热场的温度提高；喷管中心间距继续减小，微喷管阵列火焰开始聚并、向大火焰转变，燃烧反应区间变长、均温场处的燃尽率下降，微喷管火焰丧失微火焰特性；因此确定微火焰阵列加热场喷管中心间距这一重要参数时，需综合考虑温度均匀性、热负荷、燃尽率和污染物等因素。

英文摘要:

      With the same fuel load and nuzzle physical conditions, a numerical model of methane premixed microflame array combustor was built to optomize the combustion heating system of micro array flame. The temperature and burn-out characterisrtics with different nozzle center distance was also studied. The results show that a heating field with uniform temperature could be formed by the optimized microflame array combustor. With shorter nozzle center distance, the iteraction among microflame would be enhanced, thus the temperature of heating field was increasing. However, when the nozzle center distance shortens further, the micro flames of array combustor begin to merge and turn to be a big single flame. Correspondingly, the burn-out reaction time was longer and the burn-out rate was lower, until the microflame characteristics disappeared. Therefore, multiple factors, like the tenperature uniformity, fule load, burn-out rate and pollutants, need to be considered comprehensively to design the nozzle distance of microflame array combustor.