方案摘要
方案下载| 应用领域 | 能源/新能源 |
| 检测样本 | 其他 |
| 检测项目 | |
| 参考标准 | 暂无 |
首先用Ekspla公司的PL2143型皮秒脉冲激光器泵浦的PG401波长可调谐光学参量发生器，对248纳米激发的甲苯长波和短波荧光分量的比值进行了标定实验。然后采用LaVision公司两台图像增强器IRO加ImagerIntense相机。构成一套甲苯激光诱导荧光双色测量系统。激发光源采用KrF准分子激光器。利用甲苯荧光不同分量的比值，研究了跨音速喷嘴流动，识别不完全分子混合的特性。
Toluene laser-induced fluorescence (LIF) has been applied to image the mixing deficit on the molecular level in the transonic wake of two different blunt-body injectors in a compressible accelerated nozzle flow. A single-color excitation and two-color detection scheme is employed to measure the signal red-shift caused by the quenching effect of molecular oxygen on the fluorescence of toluene, which reduces and red-shifts the LIF signal if both substances interact on a molecular level. To this end, toluene is injected alternatingly with O2-contaning and O2-free carrier gas into the air main flow. Differences of both signals mark regions where mixing on molecular level is incomplete. A zone of molecular mixing deficit extending several millimeters in stream-wise direction is identified. The effect of local variations in temperature on the sensitivity of this technique is discussed using photo-physical data measured in a stationary low-temperature cell.
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