This paper presents a new concept of a partial flow sampling system (PFSS), involving a two-stage dilutor which operates at underpressure, while exhaust is sampled through a capillary. The sample flowrate is in the order of few cubic centimeters per minute. Due to the low flowrate, no tight fixation is required between the exhaust line and the capillary inlet. The dilutor may sample from an opening in the exhaust line which freely exhausts to ambient pressure. As a result, the PFSS operates at constant pressure conditions even upstream of diesel particle filters (DPF). A straightforward mathematical model is then developed to calculate the dilution ratio (DR), depending on the dilution air flowrate and the dilutor underpressure. The model is validated using CO2 as a trace gas, and a very good agreement is demonstrated between the calculated and the measured DR values. After validation, the PFSS is combined with electrical aerosol detection devices to measure the exhaust particle concentration of a diesel engine operating at different steady-state modes. Also, the filtration efficiency of two particle filters is examined by respectively providing exhaust samples upstream and downstream of each filter. These applications demonstrate the stability and applicability of the PFSS combined with an aerosol instrument to measure the filtration efficiency of a DPF at low cost. Future applications of such configuration may include particle exhaust concentration measurements and on-board (portable) emission measurements.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A New Constant Dilution Ratio Concept for Vehicle and Engine Exhaust Particle Sampling


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    SAE World Congress & Exhibition ; 2008


    Erschienen in:

    Erscheinungsdatum :

    14.04.2008


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    A new constant dilution ratio concept for vehicle and engine exhaust particle sampling

    Ntziachristos,L. / Tzamkiozis,T. / Manakos,A. et al. | Kraftfahrwesen | 2008


    2008-01-0762 A New Constant Dilution Ratio Concept for Vehicle and Engine Exhaust Particle Sampling

    Ntziachristos, L. / Tzamkiozis, T. / Mamakos, A. et al. | British Library Conference Proceedings | 2008


    Improving the calculation of exhaust gas dilution during constant volume sampling

    Austin,T.C. / Caretto,L.S. / Sierra Research,US | Kraftfahrwesen | 1998


    Improving the Calculation of Exhaust Gas Dilution During Constant Volume Sampling

    Austin, T. C. / Caretto, L. S. / Society of Automotive Engineers | British Library Conference Proceedings | 1998


    Improving the Calculation of Exhaust Gas Dilution During Constant Volume Sampling

    Caretto, L. S. / Austin, Thomas C. | SAE Technical Papers | 1998