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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

[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,; b( C* \) ?% ]% J- H5 v. l
a. Mass is conserved (i.e., mass can be neither created nor destroyed).6 q9 Y$ W I% [8 R
b. Newton’s second law: force = mass × acceleration.
4 @; e: ?6 \3 e! [) ]5 s5 m" h5 ~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.
0 d& y+ T  E4 _7 s% c这些方程如下：
! r( Z5 Y, b' ~4 i0 |& S( g0 f1.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 y9 Q  a' N$ X" E, f. i/ {1.质量是守恒的（即既不能产生质量也不能破坏质量）。2 l* ]/ u, S5 f  e) Q
2.牛顿第二定律：力=质量×加速度。5 c% y5 J' ?2 D. `( l, G2 P( B
3.节约能源; 它只能从一种形式变为另一种形式。, y3 j! {! m$ D  l. Q9 E& p% `
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。7 V# c6 f; V  M3 i' f' r
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。5 T7 N) r5 q; I0 o* |" _

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作者: 3477959497 时间: 2019-4-22 10:50
不错。。。。。。。。。。。。。

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