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Combustion & systèmes réactifs

Contexte de la recherche et objectifs

Chemical kinetic studies are necessary for understanding combustion processes. They allow analysing new combustion concepts and predicting energy release. Furthermore, combustion chemistry is useful for developing new fuels and understanding the formation of pollutants and potential means of reduction in future applications (engines, burners …).

The development of detailed and reduced chemical kinetic reaction mechanisms involves the computation and measurement of fundamental parameters (thermochemical properties, rate constants) and development of experimental databases (ignition delays, fundamental flame propagation velocities…) to validate the proposed kinetic schemes. Such databases are obtained under well-controlled laboratory conditions. ICARE has equipments available for measuring fundamental parameters and providing experimental databases for model validations. Several ‘ideal’ complementary reactors are currently used with appropriate diagnostics :

  • Heated spherical combustion chambers for the measurement of fundamental burning velocities of gaseous and liquid fuels at high pressures by fast speed ombroscopy imaging. The spherical bombs used at ICARE have characteristics not entirely available for similar equipments in France : maximum heating temperature of 210°C, high operating pressure (50 bars), and large internal volume (56 L) allowing reliable laminar combustion properties measurements (laminar flame speeds, Markstein lengths, maximum combustion overpressure)
  • Burners
    • A recently implemented unique high pressure counter-flow burner facility (maximum chamber pressure 5MPa) allowing, as a first step, the stabilisation of laminar premixed counter flow flames up to 1MPa (as well as partially premixed or diffusion flames,), with optical access for laser diagnostics (such as Laser Induced Fluorescence, Emission, Absorption, Raman spectroscopy, Cavity Ring Down Spectroscopy) for major and minor chemical species, radicals, pollutants and temperature measurements.
    • Flat flame burner with probe sampling for characterization and measurement of stable chemical species by gas phase chromatography (CPG-FID-TCD) and FTIR
  • Pressurized jet stirred reactors (JSR) that can operate over an extended range of temperature (500-1500 K, covering both low and high temperature oxidation regimes), pressure (0.1- 4.0 MPa), and equivalence ratio (0.02-4). This is a unique and powerful system allowing operation at pressures as high as those encountered in gas turbines. Chemical analyses of stable species are performed using complementary techniques such as FTIR, GC-MS-FID-TCD, trap and HPLC.
  • High pressure shock tubes (ST) that can operate up to ca. 5000 K. They are equipped with complementary diagnostics such as ARAS, Laser Scattering/Extinction, UV and IR absorption, detection of OH* and CH* emission. ICARE has a large ensemble of shock tubes for chemical kinetic studies and its ST-ARAS set-up is unique in France whereas only few are operating worldwide.