From the flow diagram below we see that the main program 'stim'
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 either
the function 'adiabatic'
which does an Ideal Adiabatic simulation, or the function 'simple'
to do a Simple simulation to evaluate the heat transfer and pressure
drop loss effects. Function set 'simple' includes ten functions,
which are all declared in the header file 'simple.h'. The four
main routines are 'hotsim'
and 'kolsim'
to respectively evaluate the heater and cooler gas temperatures,
function 'regsim'
to evaluate the regenerator effectiveness and resulting enthalpy
loss, and function 'wrksim'
to evaluate the pumping loss. Function 'minmax'
is used to determine the heat transferred in a single blow though
the regenerator. Function 'reynum'
evaluates the instantaneous Reynolds Number, and the remaining
three functions, 'pipfr', 'foilfr',
and 'matfr' are used to determine
the various flow friction and heat transfer coefficients.
The dynamics of the solution algorithm lies in function 'simple',
as shown in the following flow diagram. Thus the function 'define'
specifies the operating conditions, including the temperature
bounds Th and Tk. Since the temperature bounds of the working
gas affect both the power output and efficiency, the simple routine
invokes 'adiab',
'hotsim',
and 'kolsim'
in a loop until convergence of the gas temperatures is attained.
Notice that there are a limited number of heat exchanger configurations specified. As before, it is intended that the user will modify and augment this system as required for specific systems, and as more updated heat transfer correlation data becomes available. __________________________________________________________________________
Telnet:
"condor"We assume that all of the modules of the 'define' function set as well
as the 'adiab'
function set are already in your home directory. After logging
on to "condor" change directory to the 'simple' directory:
cd /home/condor/stirling/simple
The modules in the 'simple' function
set specified above are in this directory, and should be copied
to your home directory as follows:
cp * ~
We now have all of the files required for a complete simulation.
The 'makefile'
required to compile the complete system is in the 'stirling'
directory, and should be copied to your home directory as follows:
cd /home/condor/stirling
cp makefile ~
The system is then compiled and linked as follows:
make stim
In order to simulate the Ross D90 Yoke drive engine used
in the course case study, when executing 'stim', specify the data
file 'ross90.dat'.
__________________________________________________________________________
Back to the Stirling Cycle Machines home page