In this thesis, a Thermal Model Tool (TMT) is developed for standard Avionic
Transport Rack (ATR) chassis and thermal design of a standard ATR chassis is done
using developed TMT. This ATR chassis is a Digital Moving Map (DMAP) of a
helicopter and the tool is used to determine the cooling channel details of DMAP.
TMT decreases design process steps and eliminates the complexity of the design.
Experimental studies are conducted on one of the existing chassis produced in
Aselsan Inc. for different operating conditions. There are two different operating
conditions for the chassis as 25 º / C and 55 º / C, which are given, in military standard
MIL-STD-810F. Critical temperature values are measured, which are used in
analytical calculations, and results are represented.
At the first step, outputs of the experimental studies are used in analytical calculation
in order to develop TMT. Secondly, heat dissipation rate of two different chassis are
v
calculated easily by using the TMT, and without making effort for CFD analysis, the
necessary number of plate fins of the chassis are assessed considering given
geometrical constraints and heat loads. Finally, cooling channels are generated using
the results of TMT.
In the next step the chassis, which are designed using the results of TMT, are
analyzed numerically by using Icepak Computational Fluid Dynamics (CFD) tool
and results of TMT are verified. The cooling capacities of the decided plate fins,
which are obtained by TMT, are checked whether or not the required heat dissipation
rates are ensured.
Consequently, TMT is tested under for two different operating conditions on two
different chassis. Analytical and numerical studies for both conditions are compared
and discussed in detail. Comparisons show that, developed TMT results are
meaningful and close to numerical results, therefore TMT can be used in
forthcoming ATR chassis designs.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12613517/index.pdf |
| Date | 01 August 2011 |
| Creators | Colpa, Bekir Onur |
| Contributors | Tari, Ilker |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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