An experimental heat transfer study was performed on the exhaust system of a diesel powered light-duty vehicle. The following conclusions can be drawn: 1. Most of the energy loss in the exhaust system occurred in the turbocharger (nearly equal 35 %), as expected, followed by the takedown pipe (nearly equal 30 %), the tailpipe (nearly equal 15 %), the close-coupled oxidation catalyst (nearly equal 10 %) and the underbody LNT (Lean-NOx-Trap), where the energy loss was less than 10 %. 2. All of the catalytic exothermic energy released came from the close-coupled catalyst. The underfloor LNT relied solely on convective heat transfer from the hot exhaust gases for heating. 3. The heat transfer measurements at the takedown pipe and tailpipe were well correlated by the following equations, respectively Nu = 0.209 Re0.60, Nu = 0.453 Re0.51. 4. Application of the steady-state correlations to temperature measurements obtained in fuel-step transient experiments at constant engine speed showed that the energy storage by the walls was significant for at least the first 200 sec of the step test. This clearly indicates the importance of interior insulation of the exhaust in order to minimize heat losses and consequently temperature loss during the cold-start.
Temperature and heat transfer measurements in the exhaust system of diesel-powered light-duty vehicle
Messungen der Temperatur und des Wärmeüberganges in der Abgasanlage eines Kraftfahrzeuges bis 2,7 to Gesamtgewicht mit Dieselantrieb
2003
26 Seiten, 18 Bilder, 1 Tabelle, 29 Quellen
Aufsatz (Konferenz)
Englisch
British Library Conference Proceedings | 2003
|Thermal Studies in the Exhaust System of a Diesel-Powered Light-Duty Vehicle
SAE Technical Papers | 2004
|Thermal Studies in the Exhaust System of a Diesel-Powered Light-Duty Vehicle
British Library Conference Proceedings | 2004
|Thermal Studies in the Exhaust System of a Diesel-Powered Light-Duty Vehicle
British Library Conference Proceedings | 2004
|