3.7 Compressible Flow
Ajay Kumar
Introduction
This section deals with compressible ?ow. Only one- or two-dimensional steady, inviscid ?ows under
perfect gas assumption are considered. Readers are referred to other sources of information for unsteady
effects, viscous effects, and three-dimensional ?ows.
The term compressible ?ow is routinely used to de?ne variable density ?ow which is in contrast to
incompressible ?ow, where the density is assumed to be constant throughout. In many cases, these
density variations are principally caused by the pressure changes from one point to another. Physically,
the compressibility can be de?ned as the fractional change in volume of the gas element per unit change
in pressure. It is a property of the gas and, in general, can be de?ned as
One-Dimensional Flow
In one-dimensional ?ow, the ?ow properties vary only in one coordinate direction. Figure 3.7.1 shows
two streamtubes in a ?ow. In a truly one-dimensional ?ow illustrated in Figure 3.7.1(a), the ?ow variables
are a function of x only and the area of the stream tube is constant. On the other hand, Figure 3.7.1(b)
shows a ?ow where the area of the stream tube is also a function of x but the ?ow variables are still a
function of x only. This ?ow is de?ned as the quasi-one-dimensional ?ow. We will ?rst discuss the truly
one-dimensional ?ow.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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