低排放燃烧室燃料空气预混均匀性研究

Study on Premixing Uniformity of Fuel and Air in Low Emission Combustor

为了解决燃料与空气均匀预混的问题,以气态燃料-低排放塔式同轴分级燃烧室为研究对象,采用数值模拟与实验设计数理统计方法相结合,研究了主燃级叶片角、叶片数、燃料速度和单面孔数对燃料和空气预混特性的影响,筛选出对燃料空气预混均匀性影响的显著项,并拟合得出均匀性的预测公式。结果表明:单面孔数及其平方项对预混均匀性影响最大;燃料速度与叶片角、燃料速度与单面孔数的交互效应其次;叶片数、叶片角、燃料速度及其平方项和交互项对均匀性的影响最小。

In order to solve the problem of uniform premixing of fuel and air,low emission tower-type coaxial-staged combustor with gaseous fuel was selected as the research object.The effects of blade angle,blade number,the velocity of fuel and the number of one-side fuel hole in main combustion stage on the premixing characteristics of fuel and air were explored by combining numerical simulation and design of experiments.The significant terms that affected fuel-air premixing uniformity were screened out,then a prediction formula for premixing uniformity was obtained by fitting.The results show that the number of single-side fuel hole and its quadratic term are the significant factors affecting the premixing uniformity;the interaction effects between the velocity of fuel and blade angle,the velocity of fuel and number of one-side fuel hole are considered as the second significant factors;the effects of blade number,blade angle and the velocity of fuel and their quadratic and interaction terms on uniformity are not significant.