内燃机热效率提高 Where does the energy go? University of Wisconsin RCCI low temperature combustion engine Gross thermal efficiency ~37.6% Gross thermal efficiency:59.7 %/o (Reitz et al.2012) .Ideal Carnot efficiency ~1-300/1800=83% .Otto cycle efficiency:68%(compression ratio of 17) 《燃烧学基础》1，绪论 陈正(cz@pku.edu.cn21 Low temperature combustion Newton's cooling equation >Super-Lean burn q(0)=A-h()(Tgas(0)-Tsurface(0)] Reduction o Super-Lean erating High turbulent flow (=20~50 m/s,u'=5 m/s) High EGR (EGR rate =20 % (ida2017) 《燃烧学基础》1，绪论 陈正(cz@pku.edu.cn)22澦࢖䏝؅ׁक澧ͬ ঠ੥ ୟࠔ I`&VQ[KJ[IT ޻⟹ᵰ✣᭾⦽ᨆ儎 21 Gross thermal efficiency ~ 37.6% Ideal Carnot efficiency ~ 1-300/1800=83% Otto cycle efficiency: 68% (compression ratio of 17) Gross thermal efficiency˖ 59.7 % University of Wisconsin RCCI low temperature combustion engine (Reitz et al. 2012) 澦࢖䏝؅ׁक澧ͬ ঠ੥ ୟࠔ I`&VQ[KJ[IT Low temperature combustion  (lida 2017)