Polytropic Process Defining a polytropic process of a closed system: 400 300 燃烧结束 Logog'气，p=consn log p 200 点火 Any gas/liquid 100 =1.30 60 膨胀 State1→State2: 40 压缩 1=1.29 30 20 排气 p网p,”or 大气 10 8 index 6 56810 203040V constant.-o∞~+o∞ In(p2/p) n= Exp.observation log V In(v/v2) 上游充通大 March 25,2019 2 SHANGHAI JIAO TONG UNIVERSITYMarch 25, 2019 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 p V 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