方案摘要
方案下载应用领域 | 其他 |
检测样本 | 其他 |
检测项目 | |
参考标准 | 暂无 |
美国著名科研单位,圣地亚国家实验室采用LaVision公司的平面激光诱导荧光测试系统(PLIF)对本生灯的火焰进行了OH和甲醛自由基的空间分布的同时测量。激光源采用美国光谱物理公司的Pro 290型大能量Nd:YAG激光器。紫外355nm输出能量达到500毫焦。采用透镜耦合的图像增强器IRO测量微弱的荧光信号。
Results are presented here from a three-dimensional direct numerical simulation of a temporallyevolving
planar slot jet flame and experimental measurements within a spatially-evolving axisymmetric
jet flame operating with DME (dimethyl ether, CH3OCH3) as the fuel. Both simulation and experiment
are conducted at a Reynolds number of 13050. The Damko¨ hler number, stoichiometric mixture fraction
and fuel and oxidizer compositions also are matched between simulation and experiment. Simultaneous
OH=CH2O PLIF imaging is performed experimentally to characterize the spatial structure of the turbulent
DME flames. The simulation shows a fully burning flame initially, which undergoes partial extinction and
subsequently, reignition. The scalar dissipation rate (v) increases to a value much greater than that
calculated from near-extinction strained laminar flames, leading to the observed local extinction. As the
turbulence decays, the local values of v decrease and the flame reignites. The reignition process appears
to be strongly dependent on the local v value, which is consistent with previous results for simpler fuels.
Statistics of OH and CH2O are compared between simulation and experiment and found to agree. The
applicability of OH=CH2O (formaldehyde) product imaging as a surrogate for peak heat release rate is
investigated. The concentration product is found to predict peak heat release rate extremely well in the
simulation data. When this product imaging is applied to the experimental data, a similar extinction/
reignition pattern also is observed in the experiments as a function of axial position. A new 30-species
reduced chemical mechanism for DME was also developed as part of this work.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
相关产品
汽车光学检测系统AIS
PT403型波长可调谐皮秒激光器
ANL系列高能量高重复频率DPSS纳秒激光器
APL4206 系列高能量皮秒激光放大器
UltraFlux FF/FT 5000 高能量可调谐飞秒激光器系统
UltraFlux FT300型波长可调谐飞秒激光器系统
Ekspla 超高功率激光器系统SYLOS 2A
LaVision PTUx 可编程时间控制单元
LaVision 用于粒子成像测速PIV的相机
LaVision StrainMaser 全场应变测试系统组件
LaVision 用于数字图像相关DIC的相机
LaVision StrainMaster 数字图像相关分析软件包
LaVision 标定板
LaVision StrainMaster 形变应变成像测量系统
LaVision StrainMaster DVC 体视全场应变测量系统
关注
拨打电话
留言咨询