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Technical Data and Research
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
Posts: 13 ![]() |
Setting up a Topic for technical data pertaining to launch, mission control, platform design, rocket design and engineering, payload design, aerospace research etc.
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
Posts: 13 ![]() |
A paper evaluating the latest methods to calculate drag coefficients of spacecraft traveling in low Earth orbits (LEO).
http://www.sciencedirect.com/science/ar ... 2113000754 Spacecraft drag modelling David Mostaza Prieto, Benjamin P. Graziano, Peter C.E. RobertsCorresponding author contact information, E-mail the corresponding author Space Research Centre, School of engineering, Cranfield University, United Kingdom Progress in Aerospace Sciences Volume 64, January 2014, Pages 56–65 Abstract This paper reviews currently available methods to calculate drag coefficients of spacecraft traveling in low Earth orbits (LEO). Aerodynamic analysis of satellites is necessary to predict the drag force perturbation to their orbital trajectory, which for LEO orbits is the second in magnitude after the gravitational disturbance due to the Earth's oblateness. Historically, accurate determination of the spacecraft drag coefficient (CD) was rarely required. This fact was justified by the low fidelity of upper atmospheric models together with the lack of experimental validation of the theory. Therefore, the calculation effort was a priori not justified. However, advances on the field, such as new atmospheric models of improved precision, have allowed for a better characterization of the drag force. They have also addressed the importance of using physically consistent drag coefficients when performing aerodynamic calculations to improve analysis and validate theories. We review the most common approaches to predict these coefficients. |
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
Posts: 13 ![]() |
Lightning strike protection of composites
http://www.sciencedirect.com/science/ar ... 2113000651 Martin Gagné, Daniel TherriaultCorresponding author contact information, E-mail the corresponding author Center for Applied Research on Polymers and Composites (CREPEC), Mechanical Engineering Department, École Polytechnique de Montréal, C.P. 6079, Succursale Centre-Ville, Montreal, QC, Canada H3C 3A7 Progress in Aerospace Sciences Volume 64, January 2014, Pages 1–16 Elsevier | http://www.sciencedirect.com/ Abstract Aircraft structures are being redesigned to use fiber-reinforced composites mainly due to their high specific stiffness and strength. One of the main drawbacks from changing from electrically conductive metals to insulating or semi-conducting composites is the higher vulnerability of the aircraft to lightning strike damage. The current protection approach consists of bonding a metal mesh to the surface of the composite structure, but this weight increase negatively impact the fuel efficiency. This review paper presents an overview of the lightning strike problematic, the regulations, the lightning damage to composite, the current protection solutions and other material or technology alternatives. Advanced materials such as polymer-based nanocomposites and carbon nanotube buckypapers are promising candidates for lightweight lightning strike protection technology. Keywords Lightning strike protection; Composites; Conductive material; Nanomaterials; Coating; Aircraft |
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
Posts: 13 ![]() |
Control of low Reynolds number flows by means of fluid–structure interactions
I. GursulCorresponding author contact information, E-mail the corresponding author, D.J. Cleaver, Z. Wang University of Bath, Department of Mechanical Engineering, Bath BA2 7AY, United Kingdom http://www.sciencedirect.com/science/ar ... 2113000857 Progress in Aerospace Sciences Volume 64, January 2014, Pages 17–55 Abstract There is great interest in small aircraft known as Micro Air Vehicles and mini Unmanned Air Vehicles due to the wide range of possible applications. This article reviews recent work that aims to exploit the flexibility of the wing structure in order to increase lift and thrust, and delay stall. Wing flexibility has often been considered to be unwanted for large conventional aircraft and measures are taken to limit the deformation. In contrast, very small aircraft flying at low speeds are not necessarily subject to the same limitation. This approach is only applicable to small aircraft because the frequencies of the wing structure and fluid flow instabilities are close to each other. Consequently, small amplitude and high-frequency motions will be considered. |
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Space Station Commander ![]() ![]()
Joined: Fri Sep 05, 2008 9:29 pm
Posts: 758 ![]() |
Quite interesting I'm particularly interested in the low Reynolds number flow article.
Monroe _________________ Today's the day! We go into Space! |
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
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Impact of turbulence modelling on external supersonic flow field simulations in rocket aerodynamics
International Journal of Computational Fluid Dynamics Volume 27, Issue 8-10, 2013 http://dx.doi.org/10.1080/10618562.2013.867951 Abstract This paper contains a three-dimensional study on the influence of different turbulence models for external supersonic flow field simulations, aiming at reaching the best accuracy in rocket aerodynamics. A well-studied test case -a slender body- has been used for the validation process, which involves the major turbulence models available. The SST k–ω model has been selected as the most suitable one for this kind of flows. Good agreements between numerical, theoretical and experimental results are obtained, which are used to set up some guidelines regarding the configuration of Reynolds-averaged Navier–Stokes Computational Fluid Dynamics (CFD) supersonic models for these flight regimes. DOI:10.1080/10618562.2013.867951 Deibi Lópeza*, Diego Domíngueza & Jesús Gonzaloa pages 332-341 Publishing models and article dates explained Received: 12 Mar 2013 Accepted: 17 Nov 2013 Published online: 12 Dec 2013 |
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
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TeraFLOP computing on a desktop PC with GPUs for 3D CFD
http://dx.doi.org/10.1080/10618560802238275 J. Tölke & M. Krafczyk pages 443-456 International Journal of Computational Fluid Dynamics Volume 22, Issue 7, 2008 Special Issue: Mesoscopic Methods And Their Applications To CFD View full text Download full text Access options DOI:10.1080/10618560802238275 Published online: 24 Jul 2008 Citations: 37 Article Views: 287 |
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Launch Director ![]() ![]()
Joined: Thu Dec 12, 2013 4:43 am
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Design specifications of H2O2/kerosene bipropellant rocket system for space missions
Aerospace Science and Technology, Available online 31 January 2014, Pages Yongjun Moon, Chul Park, Sungkwon Jo, Sejin Kwon Aerospace Science and Technology, Volume 32, Issue 1, January 2014, http://dx.doi.org/10.1016/j.ast.2014.01.006 |
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