|Preprint-No.:||< 374 >||Published in:||September 2013||PDF-File:||IGPM374_k.pdf|
|Title:||Numerical Simulation of Transpiration Cooling through Porous Material|
|Authors:||Wolfgang Dahmen, Thomas Gotzen, Siegfried Müller|
Transpiration cooling using ceramic matrix composite (CMC) materials is an innovative concept for cooling rocket thrust chambers. The coolant (air) is driven through the porous material by a pressure difference between the coolant reservoir and the turbulent hot gas flow. The effectiveness of such cooling strategies relies on a proper choice of the involved process parameters such as injection pressure, blowing ratios, material structure parameters, to name only a few. In view of the limited experimental access to the subtle processes occurring at the interface between hot gas flow and porous medium, reliable and accurate simulations become an increasingly important design tool. In order to facilitate such numerical simulations for a carbon/carbon material mounted in the side wall of a hot gas channel that are able to capture a spatially varying interplay between the hot gas flow and the coolant at the interface, we formulate a two dimensional model for the porous medium flow of Darcy-Forchheimer type. A finite element solver for the corresponding porous media flow is presented and coupled with a finite volume solver for the compressible Reynolds averaged Navier-Stokes equations. The results at Mach number M a = 0.5 and hot gas temperature Thg = 540 K for different blowing ratios are compared with experiments.
|Keywords:||Transpiration cooling, porous media flow, Darcy-Forchheimer equation, coupled finite element - finite volume schemes|
|Publication:||International journal for numerical methods in fluids|
76(6), 331-365 (2014)
Proceedings of the jointly organised 11th World Congress on Computational Mechanics (WCCM XI) : 5th European Conference on Computational Mechanics (ECCM V) ; 6th European Conference on Computational Fluid Dynamics (ECFD VI) ; Barcelona, Spain, July 20 - 25, 2014 / Eugenio Oñate ... (eds.). Organized by Spanish Association for Numerical Methods in Engineering (SEMNI) with the support of International Center for Numerical Methods in Engineering (CIMNE)