Application of laser ignition to hydrogen–air mixtures at high pressures
Application of laser ignition to hydrogen–air mixtures at high pressures
复制标题
DOI：
10.1016/j.ijhydene.2004.03.040
复制
发表时间：
2005-03
影响因子：
7.2
通讯作者：
M. Weinrotter;H. Kopecek;E. Wintner;M. Lackner;F. Winter
中科院分区：
文献类型：
--
作者：
M. Weinrotter;H. Kopecek;E. Wintner;M. Lackner;F. Winter
为了在广泛的应用领域优化燃烧，激光代表了有吸引力的未来替代点火源，特别是内燃机。实验在高压恒容实验室内进行（峰值压力高达25 MPa，初始温度为473 K）。采用不同的填充压力（p=0.5 ~ 4.2 MPa）、不同的点火能量（脉冲能量PE=1 ~ 50 mJ）、不同的腔室温度（T=393 ~ 473 K）和不同的焦距透镜（f=60、120 mm），研究了不同氢-空气混合物（空气/燃料当量比λ=1.8 ~ 8）的激光诱导点火。采用1064 nm调q Nd:YAG激光点火，脉冲持续时间约为5 ns。利用InGaAs光电探测器（800-1800 nm）和压电压力传感器表征燃烧过程。λ=2.5和3.6之间的气体混合物表现出爆燃现象。随着初始压力的增大，最小脉冲能量逐渐减小。
To optimise combustion in a wide field of applications, lasers represent attractive future alternative ignition sources, especially for internal combustion engines. Experiments were carried out in a high pressure, constant volume chamber (up to 25 MPa peak pressure and initial temperature of 473 K ). Laser induced ignition of different hydrogen–air mixtures (air/fuel equivalence ratio λ=1.8–8) was investigated, using different filling pressures (p=0.5–4.2 MPa ), different ignition energies (pulse energy PE=1–50 mJ ), different chamber temperatures (T=393–473 K ) and different focal length lenses (f=60, 120 mm ). A Q-switched Nd:YAG laser at 1064 nm with a pulse duration of about 5 ns was used for ignition. An InGaAs photodetector (800–1800 nm ) and a piezoelectric pressure transducer were used to characterise the combustion. Gas mixtures between λ=2.5 and 3.6 showed knocking combustions. With increasing initial pressures the minimum pulse energy was decreasing.