Dual-Pump CARS Measurements in a Vibrationally Nonequilibrium Supersonic Mixing Layer
Dual-Pump CARS Measurements in a Vibrationally Nonequilibrium Supersonic Mixing Layer
复制标题
振动非平衡超音速混合层中的双泵 CARS 测量
DOI：
10.2514/6.2016-1762
复制
发表时间：
2016
影响因子：
3.8
通讯作者：
W. Lempert
中科院分区：
文献类型：
--
作者：
M. Nishihara;K. Frederickson;W. Lempert
本文研究了振动激发的超声速流与快速振动平移弛豫器射流之间的振动弛豫效应。对于高至TV =2000 K的氮气放电激发超声速流，在膨胀角下游混合CO2导致膨胀角减小达∆θ = 8◦，这是振动松弛过程中热量释放的结果，由此产生的压力升高达55%。单/双泵相干反斯托克斯拉曼散射测量表明，混合层的振动温度降低，并伴随着局部CO2混合比的增加。二维振动温度分布与纹影可视化测量的修正剪切层的空间分布相吻合。振动弛豫区域也与后激波下游超声速流动中vt弛豫剂侵彻层一致，后续流动停留在相应的vt弛豫时间尺度上。
The paper presents effect of vibrational relaxation between a vibrationally excited supersonic flow and jet stream of a rapid vibration-translation (V T ) relaxer. For the discharge excited supersonic flow of nitrogen up to TV =2000 K, mixing of CO2 downstream of the expansion corner results in the decrease of expansion angle by up to ∆θ = 8◦, as a consequence of heat release during the vibrational relaxation and the resultant pressure rise by up to 55%. Single / dual pump Coherent Anti-Stokes Raman Scattering measurements demonstrated the decrease of the vibrational temperature across the mixing layer, which is accompanied with the increase of local CO2 mixture ratio. A two-dimensional vibrational temperature distribution coincides with the spatial profile of the modified shear layer measured in the schlieren visualization. The region of the vibrational relaxation is also consistent with the layer of the V T relaxer penetration into the supersonic flow downstream of the trailing shocks, with the subsequent flow residence on the corresponding time scale of the V T relaxation.
DOI：
10.1007/978-3-642-61247-3
发表时间：
1991-10
期刊：
--
影响因子：
--
作者：
Iu. P. Raizer
通讯作者：
Iu. P. Raizer