VTI National Transport Research Database

Ökad energieffektivitet hos personbilar genom optimerat kylluftsflöde kombinerat med effektiv hjul- och underredesströmning (Increased energy efficiency on passenger cars through optimized cooling flow combined with efficient wheel and underbody aerodynamics)

  • Chalmers tekniska högskola AB, Universitet eller högskola, 556479-5598
Sponsors, duration, budget: Energimyndigheten ; 2011-06-01 -- 2014-07-01 ; 3686000 kronorRegistration number:
  • Energimyndigheten 2010004572
Subject(s): Abstract: Avsikten med projektet är att att öka energieffektiviteten hos personbilar genom optimerat kylluftsflöde kombinerat med effektiv hjul- och underredesströmning. Kylluftflödet kan utgöra upp till 15 % av strömningsmotståndet. Genom optimerade kylluftsintag, ”air-shutters”, och kylflödesutlopp utefter fordonets undersida, integrerat med hjulhusströmningen, kan strömningsmotståndet kraftigt reduceras. Abstract: The aim of this project is to increase the energy efficiency of passenger cars through optimized cooling flow combined with efficient wheel and underbody aerodynamics. Due to today´ streamlining of passenger cars, the contribution of the so-called cooling flow plays a major role in the drag coefficient, and for certain models may comprise up to 15 % of the drag. By optimizing air-intakes, cooling flow outlets, using air-shutters and integrate the underbody and wheel house flows significant improvements’ may be achieved. In this process, the flow generated by the wheel rotation is key issue, and combined with the underbody flow a significant pressure difference can be obtained for the cooling air evacuation. In an earlier project, (Dnr. 530-2003-07300) an advanced detailed 30 % vehicle model and a moving belt facility was developed for studying cooling flows. The results were presented in a Ph. D. thesis 2009, with the main conclusion that higher energy efficiency can be achieved. The proposed project is a direct continuation of earlier works, and will focus on investigating the above parameters as to achieve a decrease in the order of 2-3 % in fuel consumption.
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