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Technical Data and Research

Posted by: gus777 - Sat Jan 18, 2014 4:44 pm
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Technical Data and Research 
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Launch Director
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Post Technical Data and Research   Posted on: Sat Jan 18, 2014 4:44 pm
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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Post Spacecraft drag; Free molecular flow; Rarefied aerodynamics   Posted on: Sat Jan 18, 2014 4:50 pm
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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Post Conductive Composites for Lightening Strike Protection   Posted on: Sat Jan 18, 2014 8:50 pm
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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Post Low Reynolds Number Aerodynamics for MicroVehicles and Drone   Posted on: Sat Jan 18, 2014 8:54 pm
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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Post Re: Technical Data and Research   Posted on: Sun Jan 19, 2014 12:53 am
Quite interesting I'm particularly interested in the low Reynolds number flow article.

Monroe

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Post Impact of turbulence modelling on external supersonic flow f   Posted on: Wed Jan 29, 2014 3:50 am
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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Post TeraFLOP computing on a PC w 3D CFD   Posted on: Wed Jan 29, 2014 1:08 pm
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

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DOI:10.1080/10618560802238275
Published online: 24 Jul 2008

Citations: 37
Article Views: 287


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Post H2O2/kerosene bipropellant rocket system for space missions   Posted on: Sun Feb 02, 2014 9:40 pm
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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