双波长NO-PLIF法测量运动激波前后温度场的实验研究

Temperature measurement on moving shock wave by two-wavelength NO-PLIF method

利用双波长NO-PLIF法,研究激波管内运动激波前后温度场分布.实验中以NO作为温度测量的示踪剂,分别选取波长为225.072nm和225.282nm的染料激光作为激发光,获得了较好的荧光图像.对入射激波流场的1区和2区温度分布进行了理论估算和实验测量,结果表明NO的荧光强度对温度的敏感程度与激发波长有关,当波长为225.072nm时,荧光强度随温度变化不明显,当波长为225.282nm时,荧光强度随温度变化而剧烈变化.实验测得的温度分布相对理论估算值的误差约为10%左右,这表明该方法具有较高的精度,具有一定的工程应用价值.

Experiments were conducted in the shock tube on temperature measurements with the two-line NO-PLIF technique. NO was selected as the tracer and exciting wavelengths were 225. 072 nm and 225. 282 nm, respectively. Temperatures in Zone 1 and Zone 2 of the incident shock wave were theoretically estimated and experimentally measured. The results show that the intensity of fluorescence strongly depends on temperature when the exciting wavelength is 225. 282 nm, but the dependence is not so strong when the exciting wavelength is 225. 072 nm. The error relative to the theoretically estimated value is about 10%, which implies the practicability and reliability of the NO-PLIF system.