CAJ | 학술논문

　　探索了二甲醚（ DME ）发动机的一种新型的预混等压燃烧模式，即掺混LPG燃料实现发动机的等压燃烧。基于STAR-CD平台，对某二甲醚发动机内掺混液化石油气（ LPG）燃料后的缸内喷雾与燃烧过程进行了计算与分析。计算结果表明：与纯二甲醚发动机相比，掺混LPG燃料后其滞燃期延长、燃烧持续期缩短、着火点延后；同时燃烧压力与温度有所升高，放热率峰值增大，燃烧控制在上止点附近，基本实现了发动机等压燃烧模式。为进一步提高二甲醚发动机的效率提供了重要参考。
　　탐색료이갑미（ DME ）발동궤적일충신형적예혼등압연소모식，즉참혼LPG연료실현발동궤적등압연소。기우STAR-CD평태，대모이갑미발동궤내참혼액화석유기（ LPG）연료후적항내분무여연소과정진행료계산여분석。계산결과표명：여순이갑미발동궤상비，참혼LPG연료후기체연기연장、연소지속기축단、착화점연후；동시연소압력여온도유소승고，방열솔봉치증대，연소공제재상지점부근，기본실현료발동궤등압연소모식。위진일보제고이갑미발동궤적효솔제공료중요삼고。
A new kind of premixed isobaric combustion mode that mixes LPG fuel to realize isobaric combustion of a dimethyl ether engine has been explored .Based on STAR-CD platform , the calculation and analysis of the fuel spray and combustion process in cylinder of certain dimethyl ether engine after mixing liquefied petroleum gas ( LPG) has been finished .The calculation results show that compared with the pure DME engine , after mix-ing LPG fuel , there are a longer combusting delay period , a shorter burning duration , and a delay in ignition .At the same time , the pressure and temperature of combustion rise somewhat .The peak of the heat release rate in-creases , and the combustion has been controlled nearby TDC , which show that the isobaric combustion mode of the engine has been realized basically .This measure provides a significant reference to further enhance the effi-ciency of DME engine .