Porous Layers with Heat Transfer for Future Hypersonic Propulsion
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
This work addresses the implementation of heat transport in Cranfield University’s high resolution RANS code FLAMENCO to investigate the effects of heat transfer through porous layers. A detailed literature survey was conducted to investigate the different approaches to modeling heat transport in porous media. This work highlighted the lack of availability of heat transfer models within the the turbulent compressible flow regime. As a result of this study and due to the very specific nature of the problem being simulated in terms of the SABRE precooler engine, the heat transport models implemented relied on the experimental correlation provided by the industry sponsor Reaction Engines.A constant source term in the energy equation was implemented and verified through a benchmark case study - a 2D channel flow with distributed porous media. The benchmark case study was also simulated using commercial code where the same source terms were implemented via a separate code which interfaced to the commercial software. As part of the verification process an analytical solution was derived for compressible flow through porous media. The basis of the analytical solution was found in the description of Fanno and Rayleigh flows. The solution was derived for two particular cases, the first being a flow through a duct of uniform cross-sectional area and another for cylindrically converging cross-sectional area. Newton Rhapsody and the classical Runge Kutta methods were then implemented to solve the derived equations. This work provided an effective tool with which to assess the individual effects of the source terms introduced in the governing equations.The grid convergence study for the benchmark case demonstrated the numerical solution to be grid independent and highlighted the accuracy and grid sensitivity of the higher order schemes. The results from FLAMENCO provided the least error compared to the analytical solution. The commercial code, while able to predict the pressure and temperature fields and the general trends observed, it was unable to faithfully reconstruct the velocity regardless of the scheme or the order used. Following the validation of the benchmark case study, both the commercial code and FLAMENCO were used to analyze the flow configuration within the precooler unit of the SABRE engine for two different experimental configurations.
Place, publisher, year, edition, pages
2013. , 103 p.
Technology, Hypersonics, Computational fluid dynamics, Reaction Engines, Porous Media
IdentifiersURN: urn:nbn:se:ltu:diva-56896Local ID: da30c8bc-81c2-4ec5-b3e1-c9b8d7ea269cOAI: oai:DiVA.org:ltu-56896DiVA: diva2:1030283
Subject / course
Student thesis, at least 30 credits
Space Engineering, master's level
Validerat; 20131210 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved