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.

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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.