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首页> 外文期刊>Optics Letters >Pressure measurement in supersonic air flow by differential absorptive laser-induced thermal acoustics
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Pressure measurement in supersonic air flow by differential absorptive laser-induced thermal acoustics

机译：利用差分吸收激光诱导的热声波测量超声波气流中的压力

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摘要

Nonintrusive, off-body flow barometry in Mach 2 airflow has been demonstrated in a large-scale supersonicwind tunnel using seedless laser-induced thermal acoustics (LITA). The static pressure of the gas flow is determined with a novel differential absorption measurement of the ultrasonic sound produced by the LITA pump process. Simultaneously, the streamwise velocity and static gas temperature of the same spatially resolved sample volume were measured with this nonresonant time-averaged LITA technique. Mach number, temperature, and pressure have 0.2percent, 0.4percent, and 4percent rms agreement, respectively, in comparison with known free-stream conditions.
机译：已经在大型超音速风洞中使用无籽激光诱导的热声（LITA）证明了2马赫气流中的非侵入式体外流量晴雨表。气流的静压由LITA泵工艺产生的超声波的新型差分吸收测量确定。同时，使用这种非共振时间平均LITA技术测量了相同空间分辨样品体积的流向速度和静态气体温度。与已知的自由流条件相比，马赫数，温度和压力分别具有0.2％，0.4％和4％rms的均方根值。

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