第4章理想气体的热力过程 Chapter 4 Thermodynamic processes of Ideal Gas 4.1基本热力过程 Basic thermodynamic processes p.134p313 44.2多变过程 Polytropic process ---P 135 44.3活塞式压气机的理论压缩过程 Theoretical compression process---P 336 44.4多级压缩中间冷却 Multistage Compression with inter-cooling P337~P343
第4章 理想气体的热力过程 Chapter 4 Thermodynamic processes of Ideal Gas 4.1基本热力过程 Basic thermodynamic processes--- p.134,p.313 4.2多变过程 Polytropic process ---P.135 4.3活塞式压气机的理论压缩过程 Theoretical compression process ---P.336 4.4多级压缩中间冷却 Multistage Compression with inter-cooling- -- P.337~P343
1.本章的研究任务 The task of this chapter A. It is to determine the change in the properties of working fluid during a process; (在于确定在一个过程中工质状态参数的变化量) B. It is to determine the amount of heat, work interaction between the system and its surroundings during a process. (确定在一个过程中系统与外界所交换的功量和热量的多少) 2.本章研究的对象 The object of this chapter Reversible processes of Ideal gases in closed systems (闭口系统中理想气体的可逆过程)
A. It is to determine the change in the properties of working fluid during a process; (在于确定在一个过程中工质状态参数的变化量) B. It is to determine the amount of heat, work interaction between the system and its surroundings during a process. (确定在一个过程中系统与外界所交换的功量和热量的多少) 2. 本章研究的对象 The object of this chapter Reversible processes of Ideal Gases in closed systems (闭口系统中理想气体的可逆过程) 1.本章的研究任务 The task of this chapter
3.所采取的步骤 The procedures adopted PVERT pi p2l T △=c.△T △h=c.△T &g=c, dT+ pdv q=cpdr-vdp Tas=C,dT+ pd Tds=c. dr-vdp R R ds===di ds=PdT-dp As=c In 2+rhn 2 As=c, hn2-Rhn △s=c.h2+Rh T pi Sw= pdv 6=-1 'dp dq= tas
u c T h = c p T = v q c dT pdv = v + Tds c dT pdv = v + dv v R dT T c ds v = + 1 2 1 2 ln ln v v R T T s c = v + Tds = cp dT − vdp q = c p dT − vdpdp p R dT T c ds p = − 1 2 1 2 ln ln p p R T T s c = p − 1 2 1 2 ln ln p p R v v s c = p + w = pdv wt = −vdp q = Tds 3. 所采取的步骤 The procedures adopted 2 2 2 1 1 1 T p v T p v Pv=RT =
4. 1 Basic Thermodynamic Process (4.1基本热力过程) 1等容过程 Isochoric-----Constant Volume process V=0.1979m3 P=101420Pa 合合合合
4.1 Basic Thermodynamic Process (4.1 基本热力过程) 1.等容过程 Isochoric-----Constant Volume process
(1)过程方程( Process equation For a constant volume process the addition or removal of heat will lead to a change in the temperature and pressure of the gas, as shown on the two graphs above. Substitute v=C into p,v, p2v2
For a constant volume process, the addition or removal of heat will lead to a change in the temperature and pressure of the gas, as shown on the two graphs above. Substitute into 2 2 2 1 1 1 T p v T p v v = C = 2 2 1 1 T p T p = (1) 过程方程 (Process equation)