空气动力学三大方程

杨利霞

空气动力学三大方程

[color=rgba(0, 0, 0, 0.74902)]这里写自定义目录标题

these equations, as follows:

• Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,
  , I% r1 i/ Q3 P% a/ ka. Mass is conserved (i.e., mass can be neither created nor destroyed).
  b. Newton’s second law: force = mass × acceleration.
  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.
  这些方程如下：
  ) N: r; i3 e) u9 e' {1.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
  3 U% ?3 T& q8 E5 |- u- K1.质量是守恒的（即既不能产生质量也不能破坏质量）。
  * N" ]  r8 P0 F3 q: g6 b2.牛顿第二定律：力=质量×加速度。
  2 `  u! a9 G; X# C/ x3.节约能源; 它只能从一种形式变为另一种形式。
  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。
  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。
  

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