High-speed fs/ps-CARS thermometry for supersonic H2/air combustion studies

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2025-03-25 DOI:10.1007/s00348-025-04007-y

Clément Pivard, Michael Scherman, Rosa Santagata, Guillaume Pilla, Guillaume Pelletier, Thomas Le Pichon

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Abstract

We present the results of a hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps-CARS) thermometry campaign performed in a H₂/air research supersonic scramjet combustor. In situ vertical and horizontal temperature profiles were retrieved upstream and downstream the combustion zone. The repetition rate of the measurement was adjusted in order to optimize the signal-to-noise ratio of the CARS signal depending on the local turbulence of the flow. Near the flame front, single-shot measurements were demonstrated at kHz rate to catch the high-speed temperature fluctuations. In steady flow zones downstream of the combustion, up to 100 shots integration was performed in order to increase the precision of the measurement. This measurement campaign allowed to build a valuable experimental database for comparison with a 3D numerical unsteady computational fluid dynamic (CFD) simulation developed at ONERA. This work demonstrates the efficiency of hybrid fs/ps-CARS to perform single-shot kHz thermometry inside large-scale supersonic combustor.

Graphical abstract

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超声速氢气/空气燃烧的高速fs/ps-CARS测温研究

本文介绍了在H2/air超声速冲压发动机燃烧室中进行的飞秒/皮秒相干反斯托克斯拉曼散射（fs/ps-CARS）混合测温实验的结果。在燃烧区上游和下游获取了原位垂直和水平温度分布。根据流动的局部湍流度调整测量的重复频率，以优化CARS信号的信噪比。在火焰前缘附近，以kHz速率进行了单次测量，以捕捉高速温度波动。在燃烧下游的稳定流动区，为了提高测量精度，进行了多达100次的射击积分。该测量活动可以建立一个有价值的实验数据库，用于与ONERA开发的三维数值非定常计算流体动力学（CFD）模拟进行比较。本工作证明了混合fs/ps-CARS在大型超音速燃烧室内进行单次kHz测温的效率。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.