1 / 16

# 第三章 理想 流体 动力 学 基本方程 - PowerPoint PPT Presentation

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about '第三章 理想 流体 动力 学 基本方程' - korbin

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

• §3-4动量方程和运动方程
• §3-5伯努利方程

(1) 恒定(定常)

(2) 不可压缩流体 即 =const

(3)不可压缩平面(二维) 连续性方程有

u2

2

A2

2

1

u1

A1

1

uA=const

uA=const=Q

u1A1=u2A2=Q

1

d2

2

d1

2

1

d2=200mm, 求流量和过流断面 1-1, 2-2 的平均流速

y

u

ur

r

0

x

§3-4 动量方程和运动方程

Z

dz

p

c

a

b

dy

Y

dx

X

O

dz

p

c

a

b

dy

dx

X方向:

dz

p

c

a

b

dy

dx

(1)理想

(2)恒定

(3)质量力有势fxdx+fydy+fzdz = dW

(1)理想

(2)恒定

(3)质量力有势fxdx+fydy+fzdz = dW

(4)不可压缩流体

(5)沿流线 有v=u(dy/dx) w=u(dz/dx)

(a)

(b)

( c)

(a)dx+(b)dy+( c)dz

W = -gz

(A)物理意义和几何意义

u

S

r

g

§3-5 至 3-10 伯努利方程