Eulerian versus Lagrangian simulation of unsteady two-way coupled coalescing two-phase flows in solid propellant combustionReport as inadecuate




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1 EM2C - Laboratoire d-Énergétique Moléculaire et Macroscopique, Combustion 2 Palaiseau - ONERA - The French Aerospace Lab 3 Chatillon - ONERA - The French Aerospace Lab 4 FR3487 - Fédération de Mathématiques de l-Ecole Centrale Paris 5 CTR - Center for Turbulence Research

Abstract : Solid rocket motor flows depend strongly on alumina granulometry, which spreads up with coalescence. Solving droplet sizes in unsteady flows is a modeling and numerical challenge, specially when high loadings generate retrocoupling. As an alternative to Lagrangian approaches, the Eulerian Multi-Fluid model describes polydispersity with sizesorted droplet fluids called sections. A two size moment method, that spares sections, is implemented in the CEDRE code. A new transport and coupling method allows to capture moderately dense spray structures with low diffusion. The aim is threefold: compare CEDRE-s Lagrangian and new Eulerian two-phase approaches, prove the feasibility of unsteady and complex motor flow simulations, and show the effect of coalescence on instabilities.

Keywords : Combustion Solid rocket motor Eulerian Multi-Fluid Coalescence Moderately dense spray





Author: François Doisneau - Joel Dupays - Angelo Murrone - Frédérique Laurent - Marc Massot -

Source: https://hal.archives-ouvertes.fr/



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