空气动力学三大方程

杨利霞

空气动力学三大方程
; h' I& @  b% q
5 `# b; s3 f  f. p[color=rgba(0, 0, 0, 0.74902)]这里写自定义目录标题
0 {5 o7 ?) c/ W& L5 n
3 z. e- ^5 u/ `# ]: J5 i

these equations, as follows:

• Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,
  $ F0 t$ x4 y* ?$ z0 L$ wa. Mass is conserved (i.e., mass can be neither created nor destroyed).
  b. Newton’s second law: force = mass × acceleration.
  * ?  Y. i7 L- U8 x, t. y5 t( ]* {" Bc. 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.
  这些方程如下：
  4 B/ }2 k( U4 k/ `  Q: G1.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
  . ?, X9 h( X. ]1.质量是守恒的（即既不能产生质量也不能破坏质量）。
  2.牛顿第二定律：力=质量×加速度。
  ) N" Z" H, ~$ \3.节约能源; 它只能从一种形式变为另一种形式。
  3 {  o$ I; H( {' A2.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。
  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。
  ) t2 r* g  ~+ T4 U

3477959497

不错。。。。。。。。。。。。。
. S3 T) E( A* L* ?- f9 m