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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
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[color=rgba(0, 0, 0, 0.74902)]这里写自定义目录标题
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4 g4 F+ h" {4 G2 V9 g. g' X6 K/ ?1 ?these equations, as follows:
- Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,0 q* { A3 ~4 K. h% Q. M
a. Mass is conserved (i.e., mass can be neither created nor destroyed).) K6 U% s# L9 J- w, q7 ]/ i! d) ^
b. Newton’s second law: force = mass × acceleration.# ]3 C- i7 g$ F) l
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.
) O5 N8 j: G; I9 |+ e3 c/ @2 H7 r这些方程如下:
1 |/ `" u) r0 r: e1.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
' G; o$ {2 ^; S2 a0 m: k9 r, C1.质量是守恒的(即既不能产生质量也不能破坏质量)。
; m2 A( w3 u/ {7 r9 P2.牛顿第二定律:力=质量×加速度。
% G9 P4 v r( C+ g3.节约能源; 它只能从一种形式变为另一种形式。
- T; T: G4 R" U2 T2 y2 L# W3 S4 E. u2.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。
8 o3 D' P% u( x; S: A3.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。
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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。。。。。。。。。。。。。5 x+ N9 O0 N1 a2 v- R
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