流體動力學(xué)(外文翻譯)

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流體動力學(xué) 可壓縮氣體的流動
可壓縮氣體的流動速度是可與聲音的速度媲美，甚至超越聲速的。這種氣體的壓縮是發(fā)生在氣體從一個(gè)地方移動到另一個(gè)地方時(shí)發(fā)生密度變化引起的，這種變化不可忽視。
假設(shè)流體是氣體而且在足夠低的壓力下滿足理想狀態(tài)方程。方程（118）使用，其導(dǎo)熱系數(shù)是如此的低以至于壓縮氣體和少量部分的氣體可以被視為絕熱氣體。（見上文）。在這種情況下，它遵循方程（120）描述的那樣，密度的變化伴隨著許多微妙的壓力變化，dp，是這樣的 ......



Hydrodynamics
Hydrodynamics Compressible flow in gases
Compressible flow refers to flow at velocities that are comparable to, or exceed, the speed of sound. The compressibility is relevant because at such velocities the variations in density that occur as the fluid moves from place to place cannot be ignored.
Suppose that the fluid is a gas at a low enough pressure for the ideal equation of state, equation (118), to apply and that its thermal conductivity is so poor that the compressions and rarefactions undergone by each element of the gas may be treated as adiabatic (see above). In this case, it follows from equation (120) that the change of density accompanying any small change in pressure, dp, is such that ......