Function set 'adiab' - an Ideal
Adiabatic simulation of a specific Stirling engine configuration
From the flow diagram below we see that four different systems
are invoked to do an Ideal Adiabatic simulation. The main program
'stimadiab'
first defines the system to be simulated in terms of the set of
global variables set up by the 'define'
set of functions, as described previously. It then invokes function
'adiabatic'
which solves the set of differential equations (function 'dadiab')
over a number of cycles until convergence is attained (function
'adiab'),
and then fills in the solution matrix for a complete cycle (function
'filmat')
and finally displays the solution matrix (function 'prntad'). The differential
equation set is solved by using the Classical Fourth Order Runge-Kutta
method (function 'rk4')
which is included in the system 'odes' (ordinary differential
equations). Note that the symbolic constants and function
prototypes of 'rk4' are contained in the header file 'odes.h'.
The dynamics of the solution algorithm lies in function 'adiab',
which initializes the variables, invokes the Runge-Kutta function
over a number of cycles, checks for cyclic convergence, then fills
in the solution matrix. The method of uniquely specifying the
variables of solution is done by means of symbolic constants in
the header file 'adiabatic.h'.
Notice that the function 'volume'
includes only sinusoidal volume variations (function 'sinevl')
and the Ross Yoke-drive volume variations (function 'yokevl').
As before, it is intended that the user will modify and augment
this system as required for specific systems. Furthermore, to
do the various energy and temperature plots in this chapter we
replaced the module 'prntad' with
a function 'plotad' to create data
files for off-line plotting.
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We assume that all of the modules of the 'define' function set are already
in your home directory. After logging on to "condor"
change directory to the 'adiab'
directory:
cd /home/condor/stirling/adiab
The modules in the 'adiabatic' and
'odes' function sets specified above
are in this directory, and should be copied to your home directory
as follows:
cp * ~
The complete system of funtions shown
in the above flow diagram can now be compiled and linked using
the 'makefile' as follows:
make stimadiab
In order to simulate the Ross D90 Yoke drive engine used
in the course case study, when executing 'stimadiab', specify
the data file 'ross90.dat'.
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"condor"
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