空气动力学三大方程

杨利霞

空气动力学三大方程
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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).
  6 {# h8 v, B1 C1 h- ib. Newton’s second law: force = mass × acceleration.
  5 t6 x9 U& r+ u2 Vc. 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：
  7 \# G5 @% W. r% B1.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
  1.质量是守恒的（即既不能产生质量也不能破坏质量）。
  & p6 V1 V4 j3 L$ d0 G" q/ |2.牛顿第二定律：力=质量×加速度。
  7 i" ?1 V) `/ H; K9 ]3.节约能源; 它只能从一种形式变为另一种形式。
  % N6 E4 g/ Y7 V$ p* B2.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。。。。。。。。。。。。。