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标题: 空气动力学三大方程 [打印本页]
作者: 杨利霞 时间: 2019-4-21 11:19
标题: 空气动力学三大方程
空气动力学三大方程. e& R F* k$ Y/ A1 U, p
" b0 b4 c* ~/ [- D/ f/ d ]; E[color=rgba(0, 0, 0, 0.74902)]这里写自定义目录标题
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6 w- p$ {$ a4 ?/ K) x, m8 x' `7 d: Tthese equations, as follows:
- Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,
, ~ X. ] X' {# pa. Mass is conserved (i.e., mass can be neither created nor destroyed).3 b! H# ?( e0 k6 |0 A, j$ L* ]. |
b. Newton’s second law: force = mass × acceleration.# a- O9 Y8 G0 h, u
c. Energy is conserved; it can only change from one form to another. - Determine a suitable model of the fluid. Remember that a fluid is a squishy substance, and therefore it is usually more difficult to describe than a well-defined solid body. Hence, we have to adopt a reasonable model of the fluid to which we can apply the fundamental principles stated in item 1.
- Apply the fundamental physical principles listed in item 1 to the model of the fluid determined in item 2 in order to obtain mathematical equations which properly describe the physics of the flow. In turn, use these fundamental equations to analyze any particular aerodynamic flow problem of interest.
0 @7 _2 r( O. v* M- S, p# J这些方程如下:
: E; P, e ^% X o* t/ a1.引用我们对自然的宏观观察中根深蒂固的三个基本物理原则,即, Y' z( w7 P T, |" x
1.质量是守恒的(即既不能产生质量也不能破坏质量)。7 i) O* E8 e A3 A
2.牛顿第二定律:力=质量×加速度。
+ n4 B1 A9 a! O0 q- t0 r% C( L9 Y3.节约能源; 它只能从一种形式变为另一种形式。! i8 Z5 A( p' M* r
2.确定合适的流体模型。 请记住,流体是一种柔软的物质,因此通常比明确定义的固体更难描述。 因此,我们必须采用合理的流体模型,我们可以应用第1项所述的基本原则。
, o) @* W6 z7 j1 s+ _7 z1 T$ U- {3.将第1项中列出的基本物理原理应用于第2项中确定的流体模型,以获得正确描述流动物理学的数学方程。 反过来,使用这些基本方程来分析任何感兴趣的特定空气动力学流动问题。6 p$ z7 [2 O- @! H
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网络挑战赛个人赛优秀论文集完结版.zip
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作者: 3477959497 时间: 2019-4-22 10:50
不错。。。。。。。。。。。。。% ], R, {1 T' P; l. N* ~7 L7 }
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