Recently DME is focuscd as 臼 1ternative fuel because mlE could be made fr〔,m natural gas , bi ( , − rnass gasandcoa1 . NDw I ) ME is investiga 亡 ed fuel for Diesel engine because Cetane number Df D 氏TE isalmDst as sar1 〕c as light uil , On the other hand , DMEcanbe blended wjth LPG becausec. hurncteris . tic of DME is simi ] ar as LPG . LPG 〒 s usua1 ] y used as gas fし1el for small gas engine , cooking equipmenL and stove . LPG small gas engine dr[ ves generat 〔} r tund heat pun ' ip systc 【 n , Ifmixture fuel of DME and LPG can be used instead of LPG in the [ narket , energy securjty will be safe hl the wor ! d . However , the kr } ockil コg lill / it〔,f DME is very low c 〔m コ paring Ll ) G because the auto ignitioll telnpera ・ ture ⊂ ) f DMEis almost assame as ligh 亡oiL This research jsinvestigated on kno ⊂king limitof mixture fuel〔,f DME arid LPG or [ each rati ( 川 f DME . The test en . W[ne is na ' Lural aspirated small spFirk igniti { ,n gas engine which is used for micro cogeneration sys し em . The bore size of test el〕 gine 88 mm and strol {e [ s 96 nlrn 、 The displacei皿 ent of the し cst engine is ab 〔 }ut 1 . 61iter . The engine speed is l 500 miu l 、 The result showed し hat the knockingユim辻 Llsillg DME mixture fuel could bc improved by retarded { gnition timing and A 〆 F ratic ) under the limil of blend ratio wi 亡 h〔}ut EGR is less thnn 30 % . The limit of DME blend ratio should be lcss than 40% by rctarded ignitioll しiming and controUing
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