Atomic Spectra Database

https://hal.archives-ouvertes.fr/hal-02594054/document

A review on experience feedback and numerical modeling of packed-bed thermal energy storage systems

Supersonic mixing in airbreathing propulsion systems for hypersonic flights

An adaptive high-order hybrid scheme for compressive, viscous flows with detailed chemistry

Numerical modeling and optimization of thermal stratification in solar hot water storage tanks for domestic applications: CFD study

Sensitivity analysis for thermocline thermal storage tank design

A perturbation model for stratified thermal energy storage tanks

Results from combustion experiments in a direct-connect supersonic combustor facility are presented. Successful ignition and sustained combustion of both hydrogen and ethylene fuels were achieved using an integrated aerorampinjector/plasma-torch igniter configuration. A Mach 2 nozzle was used to obtain flow simulating Mach ≈ 4 flight conditions at 27 km, at a total temperature of 1000 K and a static pressure of 42 kPa. Combustion was achieved at (global) equivalence ratios between 0.08 and 0.31 for hydrogen and 0.13 and 0.47 for ethylene, with corresponding maximum combustor pressure rises of about a factor of 4.0. One-dimensional performance analysis of the test data indicates combustion efficiencies as high as 75% for both fuels, in the leanest conditions tested. Off-design flight conditions were tested by varying the freestream air total temperature. Supersonic combustion was achieved at total temperatures as low as 530 K with hydrogen and 680 K with ethylene.

/pdf/dual-mode-combustion-experiments-with-an-integrated-aeroramp-2c8t0hp90j.pdf

Dual-Mode Combustion Experiments with an Integrated Aeroramp-Injector/Plasma-Torch Igniter

Algebraic model for thermocline thermal storage tank with filler material

The flow field and mixing in an expansion-ramp geometry is studied using large-eddy
simulation (LES) with subgrid scale (SGS) modelling. The expansion-ramp geometry
was developed to investigate enhanced mixing and flameholding characteristics while
maintaining low total-pressure losses. Passive mixing was considered without taking
into account the effects of chemical reactions and heat release, an approximation
that is adequate for experiments conducted in parallel. The primary objective
of the current work is to validate the LES–SGS closure in the case of passive
turbulent mixing in a complex configuration and, if successful, to rely on numerical
simulation results for flow details unavailable via experiment. Total (resolved-scale
plus subgrid contribution) probability density functions (p.d.f.s) of the mixture fraction
are estimated using a presumed beta-distribution model for the subgrid field. Flow
and mixing statistics are in good agreement with the experimental measurements,
indicating that the mixing on a molecular scale is correctly predicted by the LES–
SGS model. Finally, statistics are shown to be resolution-independent by computing
the flow for three resolutions, at twice and four times the resolution of the coarsest
simulation.

/pdf/large-eddy-simulation-of-mixing-in-a-recirculating-shear-3wvvhlhbp9.pdf

Aristides M. Bonanos

Papers

Sensitivity analysis for thermocline thermal storage tank design

A perturbation model for stratified thermal energy storage tanks

Dual-Mode Combustion Experiments with an Integrated Aeroramp-Injector/Plasma-Torch Igniter

Algebraic model for thermocline thermal storage tank with filler material

Large-eddy simulation of mixing in a recirculating shear flow