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
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these equations, as follows:

• Invoke three fundamental physical principles that are deeply entrenched in our macroscopic observations of nature, namely,
  a. 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.
  1 R1 |7 w& m/ n  Y9 a这些方程如下：
  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
  ) L3 ]8 F. o: s9 ~- M1.质量是守恒的（即既不能产生质量也不能破坏质量）。
  + F) L: T& ^/ n2.牛顿第二定律：力=质量×加速度。
  % d4 G9 V0 g) \4 f" I3 l3.节约能源; 它只能从一种形式变为另一种形式。
  ) p  t1 a6 Q) [! l* C2.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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不错。。。。。。。。。。。。。
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