The potential of the two-stroke engine has become more and more subject to increasing research work trying to optimise the power-weight ratio as well as the pollutant emissions, especially with the development of high efficient direct injection systems. Doubtless is the scavenging process of the two-stroke engine a most complex and troublesome problem with the numerical simulation or design of new developments. Since the proposal of the perfect mixing model of HOPKINS in 1914 lots of different models have been offered to draw conclusions about the quality of the scavenging process. These may be classified into 3 main categories, the single zone, the multi zone and the fluid mechanical models, while precision and expenditure are increasing dramatically in this order.Every category serves a special purpose. By using single zone models, a simple and handsome way is offered to collect information about the trend behaviour of an engine. In order to optimise for example the intake port design it is essential to use a model which includes detailed geometrical information. Thus leads to the complex and difficult to handle group of the fluid mechanical or comprehensive computing models. However, it is very often necessary to gather information about the scavenging process to optimise operating parameters. Therefore a model with a good ability to reproduce the real process as well as low mathematical expenditure is needed.The multi zone models are an attempt to accomplish these demands. A lot of single and multi zone models are offered by different authors. The present paper introduces and compares the models for scavenging simulation considering the aspects of precision and expenditure to offer the operator the possibility to choose the model for his individual suiting purpose. The fluid mechanical models are expelled because off their complex nature.It was found that the multi zone model group contains a semi-empirical model which is very capable of describing the scavenging process while positively combining high precision and acceptable numerical requirements, the CREST model. To analyse the trend behaviour of an engine, three models have to be considered qualified. These are the DANG/WALLACE, the BENSON/BRADHAM and the MAEKAWA model.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Evaluation on Two Stroke Engines Scavenging Models


    Additional title:

    Sae Technical Papers


    Contributors:
    Merker, G. P. (author) / Gerstle, M. (author)

    Conference:

    International Congress & Exposition ; 1997



    Publication date :

    1997-02-24




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Evaluation on two-stroke engines scavenging models

    Merker,G.P. / Gerstle,M. / Univ.Hannover,DE | Automotive engineering | 1997


    Some scavenging models for two-stroke engines

    Beaudequin,F. / Rochelle,P. / Motobecane,Bobigny,FR | Automotive engineering | 1980


    Some single zone scavenging models for two-stroke engines

    DAng, D. / Wallace, F.J. | Tema Archive | 1992


    LOOP SCAVENGING versus THROUGH SCAVENGING of TWO-STROKE ENGINES

    Hagen, A. L / Rogowski, A. R. / Taylor, C. F. et al. | SAE Technical Papers | 1958