- 1、本文档共32页,可阅读全部内容。
- 2、原创力文档(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
1.Ba Brief introduction to flight vehicles
2.Basic flight principles
Flight environment
Atmospheric environment
Standard atmosphere
At the sea level, height H= 0m,
And gas state equa( t)pionH ( )isH( RT) r H
Basic concepts of flowing fluid
Flight vehicles move in the air that is flowing
fluid.
Relative movement
9
Basic parameters of flowing fluid
9
5
State parameters of fluid: (physical
1
3
quantities) 8
0
7
Compressible:
0
1
Q r const
Liquid incompressible
Q
Air compressible, density varies with T p
Mach number
Basic rules of flowing fluid
“speed, pressure and temperature” change
Continuous equation (Mass equation)
Mass conversation law
Vr A Vr A
1 1 1 2 2 2
For incompressible fluid, densitry r , then
1 2
V A V A . Meaning
1 1 2 2
For high speed fluid, density is changed,
r const .
dA 2 dV
Thus( , 1)Mach
A V
Bernoulli equation
Energy conversation:
for incompressible, and ideal fluid,
9
1 2 1 2
9
p V p V1 r 1 2 r 2
2 2
5
1
3
文档评论(0)