Polytropic Process Defining a polytropic process of a closed system: 400 300 燃烧结束 sgpr一nogvse ph=cnsn log p 200 点火 Any gas/liquid 100 l=1.30 膨胀 State1→State2: 40 压缩 =1.29 30 20 排气 or 大气 10 8 index 6 In(p2/p) 56810 203040V constant.-o∞~+o∞ n= Exp.observation log V In(v/v2) 上游充通大 Mar/15,Wed,2017 2 SHANGHAI JIAO TONG UNIVERSITYMar/15, Wed, 2017 2 Polytropic Process Defining a polytropic process of a closed system: n pV constant  constant: -∞ ~ + ∞ State 1State 2: 1 1 2 2 n n pV p V  or 2 1 1 2 n p V p V        log p Exp. observation log V     2 1 1 2 ln / ln / p p n v v  Any gas/liquid log p=-nlogV+c index