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;
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；
2
An appropriate front lean Angle increases the range of a centrifugal compressor, improves the flow and enhances the isentropic efficiency.
合适的前倾角有利于扩大压气机工作范围，能够改善流道内的流动，提高等熵效率。
3
An assumption is made that the exhaust gas is perfectly ideal, and the gas flow within the nozzle is isentropic.