多孔介质回热微燃烧器预混燃烧特性研究

设计了多孔介质回热徽燃烧器,对微燃烧器内H2/Ak的预混燃烧特性进行了实验研究和数值模拟,实验结果表明,当过量空气系数1.0＜α＜3.0时,微燃烧器具有较高的燃烧效率,出口烟气温度和较低的燃烧热损失率,且燃烧热功率P越高,α越大,热损失率越小.当P=100 W时,其出口烟气温度最高可达到1 232 K,当α=3.0时,燃烧效率仍达到96.85％,而热损失率仅为14.87％.数值模拟结果表明,由于采用了回热夹层和多孔介质回热结构,有效地回收了热量损失,使得微燃烧器具有良好的热性能.证明设计的多孔介质回热微燃烧器是一种燃烧效率高、热损失率低的微燃烧器.

Study of the Pre-mixed Combustion Characteristics of a Porous Medium Heat Recuperation Micro-burner

Designed was a porous medium heat recuperation micro-burner and experimentally studied and numerically simulated were its H2/Ak premixed combustion characteristics.The test results show that when the excess air factor falls in a range of 1.0<α<3.0,the burner has a relatively high combustin efficiency and outlet flue gas temperature,and a relatively low combustion heat loss.Furthermore,the higher the combustion heat power P,the bigger the α and the smaller the heat loss rate.When P=100 W,the maximum outlet flue gas temperature can hit 1232 K.When α=3.0,the combustion efficiency still can reach 96.85% while the heat loss rate is only 14.87%.The numerical simulation results show that due to an adoption of a heat recuperation interlayer and porous medium heat recuperation structure,the heat lost can be effectively recovered,making the micro-burner have a good heat performance.It has been proven that the porous medium heat recuperation micro-burner thus designed is regarded as one with a high combustion efficiency and a low heat loss rate.