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Optimering av kylsystemslayout i BvS10
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
2019 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

BAE Systems Hägglunds AB har sedan 2001 tillhandahållit den midjestyrda bandvagnen BvS10. BvS10 är ett armerat och amfibiskt allterrängsfordon som är utformat för att ge operativt stöd både militärt och civilt där andra fordon inte kan. Kylsystemet i BvS10 har sitt luftintag på taket på fordonets främre del och sitt utblås bakåt ut över styrdonet som kopplar samman bak- och framvagn. I den här rapporten har det utvärderats om ändringar i geometrin av delar i kylsystemet och om den alternativa radialfläkt som identifierats ger ett gynnsammare luftflöde jämfört med den tillförda fläkteffekten. I Catia V5 ritades en förenklad grundmodell av kylsystemet i 3D och de fyra koncept som togs fram upp. De simulerades sedan i programmet FloEFD. Koncepten som togs fram visade inget gynnsammare luftflöde jämfört med den tillförda fläkteffekten. Beräkningar visar att den nya fläkten Airscrew 475MP4 IGV ger ett ökat luftflöde vid samma fläkteffekt. En optimering utfördes och visade en minskning av driveffekten för fläkten med 15,5 kW vid ett luftflöde på 6,15 kg/s. Ett byte till Airscrew 475MP4 IGV är därför rekommenderat.

Abstract [en]

BAE Systems Hägglunds AB have since 2001 provided the twin-bodied all-terrain vehicle BvS10. BvS10 is an armored and amphibious vehicle that is designed to provide total operational support where other vehicles cannot. The cooling system in BvS10 has its air intake on the roof on the front part of the vehicle and its exhaust backwards out over the connection which interconnects the rear- and front chassis. In this report, it has been evaluated whether if changes in the geometry of parts of the cooling system and if the alternative radial fan identified gives a more favorable air flow compared to the supplied fan power. Catia V5 was used to design a simplified model of the cooling system in 3D and the four concepts that were developed. Then they were simulated in FloEFD. The concepts that were developed did not show a more favorable airflow compared to the supplied fan effect. Calculations show that the new fan Airscrew 475MP4 IGV provided an increased air flow at the same fan power. An optimization was performed and showed a reduction in the drive power of the fan with 15,5 kW at an air flow of 6,15 kg/s. A change to Airscrew 475MP4 IGV is therefore recommended.

Place, publisher, year, edition, pages
2019. , p. 48
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-74567OAI: oai:DiVA.org:ltu-74567DiVA, id: diva2:1325225
Subject / course
Student thesis, at least 30 credits
Educational program
Sustainable Energy Engineering, master's level
Supervisors
Examiners
Available from: 2019-06-17 Created: 2019-06-14 Last updated: 2019-06-17Bibliographically approved

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