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Development of Efficient Methods used for Aft-body Assessment
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aerodynamics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This paper presents a Master of Science thesis project, performed at SAAB Aeronautics propulsion division in 2014. A method was developed to implement performance calculations on nozzles and aircraft aft-body’s. Creating mesh for Computational Fluid Dynamics (CFD) calculations is time consuming, so efficient methods and tools are necessary to decrease time spent on meshing. Tools used to speed up the meshing and calculation process have been developed and are described in this paper. A method was developed to be used for nozzle and aft-body geometries. Efficient tools are needed because the nozzle geometry is constantly changing at different flight conditions were every new flight condition requires a new mesh and a new calculation. To validate the method a NASA wind tunnel test was used and showed reasonably good agreement with CFD. By varying the nozzle pressure ratio, shock patterns and jet plume could also be studied, which was important to estimate the performance. Two different nozzle configurations were compared with respect to aft-body drag and nozzle performance. It is shown in this paper that parametrization of geometry and good block structure in meshing are key factors to generate a mesh with high quality.

Place, publisher, year, edition, pages
2014. , 16 p.
TRITA-AVE, ISSN 1651-7660 ; 2014:79
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-164295OAI: diva2:805330
Available from: 2015-04-15 Created: 2015-04-15 Last updated: 2015-04-15Bibliographically approved

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