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CARS thermometry in high pressure rocket combustors

机译：高压火箭燃烧器中的CARS测温

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摘要

Coherent anti-Stokes Raman spectroscopy (CARS) has been used to investigate high pressure cryogenic liquid oxygen/gaseous hydrogen (LOX/GH_2) flames at pressures up to 6.5 MPa. The method employs two synchronized broadband CARS systems to probe simultaneously H_2 and H_2O. Temperature is deduced from the H_2 and H_2O CARS profiles while the H_2O concentration is deduced from the modulation from the resonant the H_2O resonant signal superimposed on the nonresonant background signal. Details of the modeling of the CARS spectra at high pressure and the data reduction are discussed. Problems issued from the presence of liquid phase are also investigated. The results demonstrate the applicability and usefulness of CARS for investigating cryogenic combustion under representative rocket model combustor regimes where the pressure range is above the supercritical condition (P > 5.04 MPa).
机译：相干反斯托克斯拉曼光谱（CARS）已用于研究在压力高达6.5 MPa时的高压低温液态氧/气态氢（LOX / GH_2）火焰。该方法采用两个同步宽带CARS系统同时探测H_2和H_2O。从H_2和H_2O CARS曲线推导出温度，而从谐振H_2O谐振信号叠加到非谐振本底信号上的调制中推导得出H_2O浓度。讨论了在高压下对CARS谱进行建模和数据缩减的细节。还研究了由于液相存在而产生的问题。结果表明，CARS在压力范围高于超临界条件（P> 5.04 MPa）的代表性火箭模型燃烧器条件下研究低温燃烧的适用性和实用性。

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