Chapter 2 Aerodynamics: Some Fundamental Principles and Equations There is so great a difference between a fluid and a collection of solid particles that the laws of pressure and of equilibrium of fluids are very different from the laws of the pressure and equilibrium of solids Jean Le Rond d' Alembert, 1768

Chapter 4 Incompressible Flow Over Airfoils Of the many problems now engaging attention, the following are considered of immediate importance and will be considered by the committee as rapidly as funds can be secured for the purpose... The evolution of the more efficient

11. 4 PRANDTL-GLAUERT COMPRESSIBILITY CORRECTION The methods that approximately take into account of the effects of compressibility by correct the Incompressible flow results Is called compressible corrections

特别要注意:膨胀过程是一个等熵过程。 要解决的问题是:已知上游马赫数M及其它流动特性(区域1), 求通过偏转角θ膨胀后的下游(区域2)的特

如果扰动比一个简单声波强,其引起的波前就会比马赫波强产生一 个与来流夹角为β的斜激波,且β>μ。这一比较在图9.4中给出。然而, 斜激波产生的物理机理与上面描述的马赫波的产生完全相同

本节要点只有 一、计算通过正激波的流动特性变化

8.1 INTRODUCTION The purpose of this chapter and Chap. 9 is to develop shock-wave theory, thus giving us the means to calculate the changes in the flow properties across a wave.本章和第九章的目的是推导激波理论,因而得出计算通过激波的流动特性变化量的公式

一、可压缩流动的基本特征: x The pivotal aspect of high -speed flow is that the density is avariable一一密度是变量

在3.2.2节中介绍低速风洞时,我们首次介绍了风洞 扩压器(扩压段)的作用。在那里,扩压器是试验段下 游的一段扩张管道,作用是将试验段的气体的高速度降 低至扩压器出口的很低速度。一般来说,我们可以将扩 压器定义如下:扩压器是将入流速度在其出口处降低的 任意管道(in general, we can define diffuser as any duct designed to slow an incoming gas flow to lower velocity at the exit of the diffuser)

7.1半导体二极管 7.2半导体三极管 7.3三极管单管放大电路 74场效应晶体管及其放大电路 7.5多级放大电路 7.6差动放大电路 7.7互补对称功率放大电路