DIODE-LASER ABSORPTION TECHNIQUE FOR SIMULTANEOUS MEASUREMENTS OF MULTIPLE GASDYNAMIC PARAMETERS IN HIGH-SPEED FLOWS CONTAINING WATER-VAPOR
DIODE-LASER ABSORPTION TECHNIQUE FOR SIMULTANEOUS MEASUREMENTS OF MULTIPLE GASDYNAMIC PARAMETERS IN HIGH-SPEED FLOWS CONTAINING WATER-VAPOR
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DOI：
10.1364/ao.33.003296
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发表时间：
1994-05-20
期刊：
影响因子：
1.9
通讯作者：
HANSON, RK
中科院分区：
文献类型：
--
作者：
ARROYO, MP;LANGLOIS, S;HANSON, RK
利用分布反馈的InGaAsP半导体激光器，在1.38微米附近发射，以10 kHz的重复频率获得了NU1+Nu3波段H2O谱线的光谱分辨吸收分布。这些剖面被用来同时测量激波管中产生的高速一维(1-D)瞬变流动的流动参数。速度是由多普勒频移确定的，该频移是通过同时获得相对于流动方向不同角度的一对剖面来测量的。温度由相邻两条线的强度比确定。压力和密度是由分数吸收得到的。根据这些主要的气体动力学变量，确定了质量和动量通量。在激波管中进行了三种不同的混合气体：初始压力低于3Torr时纯H2O，初始压力低于120Torr时氧气中高达6%的H2O，以及初始压力低于35Torr时氧气中高达8%的H-2。在第三种情况下，入射冲击波后H-2/O2的热解产生了已知的H2O产量。对于所有三种混合物，结果与一维激波计算结果相当好。这种H2O诊断策略显示出在地面和飞行测试中的应用前景。
A distributed-feedback InGaAsP diode laser, emitting near 1.38 mum, was used to acquire spectrally resolved absorption profiles of H2O lines in the nu1 + nu3 band at a repetition rate of 10 kHz. The profiles were used for simultaneous measurements of flow parameters in high-speed, one-dimensional (1-D) transient flows generated in a shock tube. Velocity was determined from the Doppler shift, which was measured with a pair of profiles simultaneously acquired at different angles with respect to the flow direction. Temperature was determined from the intensity ratio of two adjacent lines. Pressure and density were found from the fractional absorption. From these primary gasdynamic variables, the mass and momentum fluxes were determined. Experiments were conducted with three different gas mixtures in the shock tube: pure H2O at initial pressures lower than 3 Torr, up to 6% of H2O in O2 at initial pressures below 120 Torr, and up to 8% of H-2 in O2 at initial pressures below 35 Torr. In the third case, pyrolysis of H-2/O2 behind incident shocks produced known yields of H2O. With all three mixtures, results compare well with 1-D shock calculations. This H2O diagnostic strategy shows promise for applications in both ground and flight testing.