Progress in FGM-LES modeling of igniting n-heptane sprays
in a constant volume
Citation for published version (APA):
Bekdemir, C., Somers, L. M. T., Goey, de, L. P. H., Tillou, J., & Angelberger, C. (2011). Progress in FGM-LES modeling of igniting n-heptane sprays in a constant volume. 51-52. Poster session presented at conference; COMBURA 2011.
Document status and date: Published: 01/01/2011 Document Version:
Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:
• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.
• The final author version and the galley proof are versions of the publication after peer review.
• The final published version features the final layout of the paper including the volume, issue and page numbers.
Link to publication
General rights
Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain
• You may freely distribute the URL identifying the publication in the public portal.
If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, please follow below link for the End User Agreement:
www.tue.nl/taverne Take down policy
If you believe that this document breaches copyright please contact us at: openaccess@tue.nl
providing details and we will investigate your claim.
Progress in FGM-LES modeling of
igniting n-heptane sprays in a constant volume
& %HNGHPLU1∗ /07 6RPHUV1 /3+ GH *RH\1 - 7LOORX2 & $QJHOEHUJHU2
1'HSDUWPHQW RI 0HFKDQLFDO (QJLQHHULQJ ZZZFRPEXVWLRQWXHQO
(LQGKRYHQ 8QLYHUVLW\ RI 7HFKQRORJ\ 7KH 1HWKHUODQGV
2,)3 (QHUJLHV 1RXYHOOHV 5XHLO 0DOPDLVRQ )UDQFH
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nKHSWDQH VSUD\V LQ D FRQVWDQW YROXPH FKDPEHU
Numerical code
7KH FRGH WKDW KDV EHHQ XVHG LQ WKLV VWXG\ LV $9%3 ZKLFK LV RZQHG E\ &(5)$&6 DQG ,)3 (QHUJLHV 1RXYHOOHV $9%3 LV D SDUDOOHO &)' FRGH IRU UHDFWLYH XQVWHDG\ I RZ VLPXODWLRQV RQ K\EULG JULGV ,W FDQ KDQGOH WZRSKDVH I RZV ZLWK DQ (XOHULDQ IRUPXODWLRQ DQG KDV DQ LQMHFWLRQ PRGHO VSHFLDOO\ GHYHORSHG IRU IXOO FRQH VSUD\ VLPXODWLRQV 7KH LQMHFWLRQ PRGHO UHODWHV LQMHFWRU SDUDPHWHUV WR WZRSKDVH ERXQGDU\ LQI RZ FRQGLWLRQV WKDW DSSO\ W\SLFDOO\ WLPHV WKH QR]]OH RULI FH GLDPHWHU GRZQVWUHDP RI WKH QR]]OH H[LW 0DUWLQH] HW DO )XHO
FGM: tables and implementation
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a < 7KH LJQLWLQJ I DPH KDV EHHQ VROYHG IRU D VLQJOH VWUDLQ UDWH YDOXH RI >V@ $OO QHHGHG TXDQWLWLHV PD\ EH FKHPLFDO VRXUFH WHUPV VSHFLHV PDVV IUDFWLRQV WKHUPRG\QDPLF SURSHUWLHV HWF DUH VWRUHG DV IXQFWLRQ RI PL[WXUH IUDFWLRQZ DQG SURJUHVV YDULDEOHY KHUH GHI QHG DV WKH VXP RI &22 &2 DQG +22
DPELHQW R[\JHQ >PROH 22@ DPELHQW WHPSHUDWXUH .
DPELHQW GHQVLW\ NJP3
QR]]OH RULI FH GLDPHWHU PP LQMHFWLRQ SUHVVXUH 03D
IXHO nKHSWDQH
IXHO WHPSHUDWXUH .
Figure 1: Conditions baseline n-heptane (http://www.sandia.gov/ecn/index.php) DPELHQWR[\JHQFRQWHQW>PROH2@ DXWRíLJQLWLRQGHOD\D62,>PV@ PHDVXUHPHQW VLPXODWLRQ
Figure 2: Auto-ignition delay as function of the ambient oxygen content.
,Q WKLV VWXG\ D YHU\ FRPSDFW UHDFWLRQ PHFKDQLVP LV XVHG WKDW LV EDVHG RQ WKH nKHSWDQH PHFKDQLVP RI 3HWHUV HW DO & ) 7KH VL]H LV UHGXFHG OHDGLQJ WR D PHFKDQLVP ZLWK UHDFWLRQV DPRQJ VSHFLHV 'XULQJ WKH /(6 VLPXODWLRQV WUDQVSRUW HTXDWLRQV IRU Z DQG Y DUH VROYHG ZKLFK DUH XVHG WR ORRNXS GHVLUHG TXDQWLWLHV IURP WKH )*0 WDEOH 6R IRU QRZ WKH YDULDQFHV DUH QHJOHFWHG
∗&RUUHVSRQGLQJ DXWKRU FEHNGHPLU#WXHQO
&20%85$
Preliminary results
,Q WKLV VHFWLRQ WKH VLPXODWLRQ UHVXOWV RI 6DQGLD¶V EDVHOLQH nKHSWDQH FDVHV DUH FRPSDUHG WR H[SHUL PHQWDO GDWD $OO VLPXODWLRQV KDYH EHHQ SHUIRUPHG RQ DQ XQVWUXFWXUHG JULG ZLWK D PHVK VL]H RI μP DW WKH QR]]OH H[LW WKDW JUDGXDOO\ LQFUHDVHV WR μP GRZQVWUHDP 7KH FDVH FRQGLWLRQV DUH VXPPDUL]HG LQ )LJ
,JQLWLRQ GHOD\ LQ H[SHULPHQWV LV GHI QHG DW UDSLG SUHVVXUH ULVH PDUNLQJ WKH EHJLQQLQJ RI VHFRQG VWDJH KLJK WHPSHUDWXUH FKHPLVWU\ 7KLV SRLQW LV QRW HDVLO\ LGHQWLI HG IURP VLPXODWLRQV 7KHUHIRUH IRU QRZ WKH LJQLWLRQ GHOD\ IURP VLPXODWLRQV LV GHI QHG DW WKH VWHHS LQFUHDVH RI PD[LPXP WHPSHUDWXUH LQ WKH GRPDLQ ZKLFK LV D VKDUS PDUN LQ WHPSRUDO VSDFH ,I RQH ZRXOG WDNH WKH H[SHULPHQWDO GHI QLWLRQ WKH QXPHULFDO LJQLWLRQ GHOD\V ZRXOG UHVHPEOH WKH H[SHULPHQWV EHWWHU EXW DV VDLG WKLV ZRXOG EH PRUH DUELWUDU\ 0HDVXUHG LJQLWLRQ GHOD\V LQFUHDVH ZLWK GHFUHDVLQJ R[\JHQ FRQWHQW 7KH VDPH WUHQG KDV EHHQ IRXQG IRU VLPXODWLRQV DV ZHOO $ FRPSDULVRQ FDQ EH VHHQ LQ )LJ
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
$ VLPLODU SLFWXUH LV VKRZQ IRU WHPSHUDWXUH FRQWRXUV LQ )LJ ,W LV FOHDU WKDW D ORZHU R[\JHQ FRQWHQW LQ WKH DPELHQW DLU VXSSUHVVHV FRPEXVWLRQ WHPSHUDWXUHV FRQVLGHUDEO\
,JQLWLRQ GHOD\ LV SUHGLFWHG TXDQWLWDWLYHO\ ZHOO DQG I DPH OLIWRII WUHQG LV FDSWXUHG FRUUHFWO\ $OWRJHWKHU WKHVH I UVW )*0/(6 VLPXODWLRQ UHVXOWV RI LJQLWLQJ nKHSWDQH VSUD\V DQG WKH FRPSDULVRQ ZLWK H[SHULPHQWV DUH HQFRXUDJLQJ
Outlook
'HYHORSPHQWV LQ )*0/(6 PRGHOLQJ RI FRPEXVWLQJ IXHO VSUD\V ZLOO FOHDUO\ EHQHI W IURP PRUH LQ GHSWK DQDO\VLV RI VLPXODWLRQ UHVXOWV 'HWDLOHG DQDO\VHV ZLOO EH GRQH WR LQYHVWLJDWH IRU LQVWDQFH WKH HIIHFW RI SUHWDEXODWLRQ RQ WKH I DPH VWUXFWXUH DQG WKH HIIHFW RI GLIIHUHQW IXHOV DQG UHDFWLRQ PHFKDQLVPV RQ WKH DXWRLJQLWLRQ EHKDYLRU
12 mole% oxygen
15 mole% oxygen
21 mole% oxygen
Figure : nstantaneous spray cross-sections of different cases showingY-source contours shortly
after auto-ignition.
12 mole% oxygen
15 mole% oxygen
21 mole% oxygen
Figure : nstantaneous spray cross-sections of different cases showing temperature contours shortly after auto-ignition.