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One of the functions that is used in calculating the forces is
the Impulse function.
The Impulse function is denoted here as
, but in the literature some
denote this function as
To explain the motivation for using this definition consider the
calculation of the net forces that acting
on section shown in Figure (4.9).
To calculate the net forces acting in the
momentum equation has to be applied
4.107) shows that the right hand side is only a function of Mach number and specific heat ratio, . Hence, if the right hand side is only a function of the Mach number and than the left hand side must be function of only the same parameters, and . Defining a function that depends only on the Mach number creates the convenience for calculating the net forces acting on any device. Thus, defining the Impulse function as
In the Impulse function when ( M=1 ) is denoted as
The ratio of the Impulse function is defined as
This ratio is different only in a coefficient from the ratio defined in equation (4.107) which makes the ratio a function of and the Mach number. Hence, the net force is
To demonstrate the usefulness of the this function consider a simple situation of the flow through a converging nozzle
Next: The Impulse Function in Up: The Impulse Function Previous: The Impulse Function Index Created by:Genick Bar-Meir, Ph.D.
On: 2007-11-21 include("aboutPottoProject.php"); ?>