1 2 1
(8.33)
对于沿流线的任意两点，我们可将能量方程写成如下 形式：
a 121u212 a 221u222 a 021con(s8.t34)
Definition of a*: a*的定义 7.5节最后一段引入 T*的定义：Consider a point in a subsonic flow where the local static temperature is T. At this point, imagine that the fluid element is speeded up to sonic velocity, adiabatically. The Temperature it would have at such sonic conditions is denoted as T*. Similarly, consider a point in a supersonic flow, where the local static temperature is T. At this point, imagine that the fluid element is slowed down to sonic velocity, adiabatically. Again, the Temperature it would have at such sonic conditions is denoted as T*.
defined T0,p0 ,and0 can be calculated from the actual conditions of
M ,T ,p and at a given point in general flow field (assuming
calorically perfect gas). They are so important that values of T0 T, p0 p and 0 obtained from Eqs. (8.40),(8.42), and (8.43), respectively ,
