流体系统每一部分的熵在运动过程中都保持不变的一种流动。
此时把空气流看作等熵流动，从而得出数学模型。
The air flux was then thought equal entropy flux, therefore the mathematical model was obtained.
描述各种假设和各项物理意义； 应用可压缩流、音速、等熵和非等熵流动、势流和有旋流动中的重要关系；
Describe assumptions, physical meaning of terms and to utilize key relationships for compressible flow, speed of sound, isentropic and non-isentropic flows, and potential and rotational flows;
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