Analytical determination of front end airflow re-circulation characteristics using CFD during automotive vehicle idle conditions and its impact on AC / PTC performance

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Analytical determination of front end airflow re-circulation characteristics using CFD during automotive vehicle idle conditions and its impact on AC / PTC performance

Stier, B. / Kaushik, S.

The phenomenon of recirculating high temperature under-hood air from an automobile's radiator outlet forward to the air conditioning condenser inlet during an engine idle condition, and its associated negative impact on both the AC and the Powertrain Cooling performance, is a well-known fact in the automotive community. The rate of rise and magnitude of condenser air inlet temperature during idle is directly proportional to the extent of the UH recirculation pattern. In this paper, the level of this recirculation is quantified via a non-dimensional number - FERF (Front End Recirculation Factor). Its direct impact on vehicle AC performance during idle is determined. Elevated levels of FERF can lead to increased rates of rise in AC refrigerant pressure and increase the potential for AC idle shut-off events. It is therefore imperative that some of the key factors affecting the nature of the recirculation pattern - e.g. vehicle fascia, grille openings, and baffle/sealing system - are optimally developed in order to meet AC performance requirements. This study proposes a methodology that combines a CFD tool effectively with a ID AC tool in determining analytically an optimal baffle/seal configuration for a particular vehicle. The temperature based non-dimensional number FERF is the bridge between the two analysis tools. Furthermore, various other AC performance parameters are investigated and system sensitivities established.

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Dokumentinformationen

Titel :

Analytical determination of front end airflow re-circulation characteristics using CFD during automotive vehicle idle conditions and its impact on AC / PTC performance

Weitere Titelangaben:

Analytische Bestimmung der Kenndaten der Rezirkulationsluftströmung an der Stirnseite mit Hilfe der numerischen Strömungssimulation während des Leerlaufs eines Kraftfahrzeuges und ihr Einfluss auf die Leistung der Klimaanlage und der Antriebsstrangkühlung

Beteiligte:

Stier, B. (Autor:in) / Kaushik, S. (Autor:in)

Erschienen in:

VTMS, Vehicle Thermal Management Systems Conference, 8 ; 635-649

Erscheinungsdatum :

2007

Format / Umfang :

15 Seiten, 17 Bilder, 5 Quellen

ISBN :

978-1-84334-348-6

Medientyp :

Aufsatz (Konferenz)