著者

Radu Rosca Edward Rakosi Comsa Iulian-Agape RADU Gaiginschi

出版者

一般社団法人日本機械学会

雑誌

JSME international journal. Ser. B, Fluids and thermal engineering (ISSN:13408054)

巻号頁・発行日

vol.44, no.4, pp.634-640, 2001-11-01

参考文献数

4

被引用文献数

2

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The paper presents the application of a three component model to the theoretical study of the combustion process of a Diesel engine fueled with sunflower oil and sunflower oil-Diesel fuel mixtures. The model assumes that the working fluid consists of three components: the fresh air, the flame and the burned gases.<BR>The combustion model uses the energy conservation equation:<BR>v<SUB>c</SUB>·Q<SUB>c</SUB>·dξ<SUB>α</SUB>=dU<SUB>α</SUB>+dL<SUB>α</SUB>+dQ<SUB>wα</SUB>, [1]<BR>where v<SUB>c</SUB> is the fuel cyclic dose, Q<SUB>c</SUB> is the fuel heating value, ξ<SUB>α</SUB>=v<SUB>cα</SUB>/v<SUB>c</SUB>, v<SUB>cα</SUB> is the quantity of burned fuel up to the moment α, U<SUB>α</SUB> is the internal energy of the working fluid, Q<SUB>wα</SUB> is the heat exchanged through the cylinder walls and L<SUB>α</SUB> is the mechanical work.<BR>The heat release law was assumed to be a Vibe type one:<BR>ξ<SUB>α</SUB>=R<SUB>c</SUB>·[1−exp(−6.9·A<SUP>m</SUP><SUB>P</SUB><SUP>p+1</SUP>)]+(1−R<SUB>c</SUB>)·[1−exp(−6.9·A<SUP>md+1</SUP>)], [2]<BR>where:<BR>·A<SUB>p</SUB>=(α−α<SUB>d</SUB>)/(α<SUB>P</SUB>−α<SUB>d</SUB>) and A=(α−α<SUB>d</SUB>)/(α<SUB>F</SUB>−α<SUB>d</SUB>);<BR>·α<SUB>d</SUB>-start of combustion angle;<BR>·α<SUB>f</SUB>-end of combustion angle;<BR>·α<SUB>P</SUB>-end of rapid combustion angle.<BR>Using Eqs. [1] and [2] we have obtained the cylinder pressure during combustion, for the vegetable fuels taken into account; the peak values were confirmed during the experiments.