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Rotational hydrogen thermometry by hybrid fs/ps coherent anti-Stokes Raman scattering in the plume of a burning metalized propellant
Applied Physics B ( IF 2.0 ) Pub Date : 2020-04-15 , DOI: 10.1007/s00340-020-07434-3
Jonathan E. Retter , Daniel R. Richardson , Sean P. Kearney

We employed a hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) instrument to probe rotational temperatures of molecular hydrogen in the multiphase reaction zone of an aluminized ammonium perchlorate (AP) propellant flame. Significant concentrations of hydrogen, present in the plume due to the decomposition of the propellant binder material and subsequent reactions with AP oxidizers, allowed for single-shot thermometry at the laser repetition rate of 1 kHz. A time-asymmetric picosecond probe pulse time-gated the impulsively generated Raman coherence at a delay of 2.66 ps from the pump and Stokes pulses, before any appreciable coherence dephasing occurred in the atmospheric pressure flames and mitigating uncertainties in the Raman transition frequencies and dephasing processes. Measurements in near-adiabatic H 2 -air flames at equivalence ratios of $$\phi$$ ϕ = 1–1.8 demonstrated measurement accuracy to near 5% of equilibrium predictions with a precision approaching 3% for high signal-to-noise ratio spectra. Introduction of a time-delayed probe pulse provided Raman-resonant spectra from the plumes of burning propellants with ample signal above broadband background emission, which were fit to libraries of synthetic spectra to infer the gas rotational temperature 0–15 mm from the burning surface. The mean fitted temperature of 2494 K from three propellant burns compares favorably to other measurements of gas and particle temperatures in similar propellant studies.

中文翻译:

通过混合 fs/ps 相干反斯托克斯拉曼散射在燃烧的金属化推进剂羽流中进行旋转氢测温

我们采用混合飞秒/皮秒相干反斯托克斯拉曼散射 (fs/ps CARS) 仪器来探测铝化高氯酸铵 (AP) 推进剂火焰多相反应区中分子氢的旋转温度。由于推进剂粘合剂材料的分解以及随后与 AP 氧化剂的反应,羽流中存在高浓度的氢气,允许以 1 kHz 的激光重复率进行单次测温。在大气压火焰中发生任何明显的相干移相并减轻拉曼跃迁频率和移相过程中的不确定性之前,时间不对称皮秒探测脉冲对脉冲产生的拉曼相干性进行时间门控,延迟时间为泵和斯托克斯脉冲的 2.66 ps . 当量比为 $$\phi$$ ϕ = 1–1.8 时,在近绝热 H 2 空气火焰中的测量表明,测量精度接近平衡预测的 5%,高信噪比光谱的精度接近 3% . 延迟探测脉冲​​的引入提供了来自燃烧推进剂羽流的拉曼共振光谱,具有高于宽带背景发射的充足信号,这些光谱适合合成光谱库,以推断距离燃烧表面 0-15 毫米的气体旋转温度。来自三种推进剂燃烧的平均拟合温度为 2494 K,与类似推进剂研究中的其他气体和颗粒温度测量值相比具有优势。图 8 展示了接近 5% 的平衡预测的测量精度,对于高信噪比光谱的精度接近 3%。延迟探测脉冲​​的引入提供了来自燃烧推进剂羽流的拉曼共振光谱,具有高于宽带背景发射的充足信号,这些光谱适合合成光谱库,以推断距离燃烧表面 0-15 毫米的气体旋转温度。来自三种推进剂燃烧的平均拟合温度为 2494 K,与类似推进剂研究中的其他气体和颗粒温度测量值相比具有优势。图 8 展示了接近 5% 的平衡预测的测量精度,对于高信噪比光谱的精度接近 3%。延迟探测脉冲​​的引入提供了来自燃烧推进剂羽流的拉曼共振光谱,具有高于宽带背景发射的充足信号,这些光谱适合合成光谱库,以推断距离燃烧表面 0-15 毫米的气体旋转温度。来自三种推进剂燃烧的平均拟合温度为 2494 K,与类似推进剂研究中的其他气体和颗粒温度测量值相比具有优势。它们适合合成光谱库,以推断距离燃烧表面 0-15 毫米的气体旋转温度。来自三种推进剂燃烧的平均拟合温度为 2494 K,与类似推进剂研究中的其他气体和颗粒温度测量值相比具有优势。它们适合合成光谱库,以推断距离燃烧表面 0-15 毫米的气体旋转温度。来自三种推进剂燃烧的平均拟合温度为 2494 K,与类似推进剂研究中的其他气体和颗粒温度测量值相比具有优势。
更新日期:2020-04-15
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