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CompressorDimensions.txt
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CompressorDimensions.txt
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Carleton University
Department of Mechanical and Aerospace Engineering
Centrifugal Compressor Meanline Design
Last Updated By: Sukhveer Sanghera (July 2013)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The purpose of this tool is to test the design of a centrifugal compressor
operating in either non-ideal or ideal fluids.
USER MANUAL
1) Enter dimensions and operating conditions of the compressor.
2) Select the compressor components you wish to include by entering a 1 or 0
where necessary. I.e. if you would like to analyze the impeller only
enter a value of ZERO for the "Diffuser Analyis" and "Volute Analysis" inputs.
3) Use the "Compressor Preliminary Design" section to vary design features
and output the important performance results of that design. It is currently
setup to vary the hub radius, shroud radius and the outlet passage width in 3
WHILE loops. There are built in maximum and minimum values to constrain each
but the number of points each is varied within these bounds can be adjusted
using the "Number of Steps in Design Studies" variable at the bottom. There
is also an option to vary the number of blades. The "Inlet Condition Study"
can be used to see the effects of reducing the temperature and pressure closer
to the critical point (and through it), however it will most likely cause REFPROP
errors and is still under construction.
4) Save this file. Be careful not to overwrite other important files. The
executable will only read the "CompressorDimensions.txt" file. It is recommended
that you save a backup file just in case.
5) Run the executable file called "CCMD.exe" in the main folder. This will run the
performance calculations and create an output file when the analysis is finished!
IMPORTANT NOTES
> DO NOT EDIT ANYTHING OTHER THAN THE VALUES (or the title bar). This is very
important or the executable will not read the values properly. The length of
the number after the "|" does not matter.
> Total Temperature and total pressure MUST have a decimal value. So remember
to put .0 after the value if you are using an integer value.
> Currently, you may only enable one option at a time.
> A number of "Error Checking" options were added to determine if there were issues
with convergence, calling REFPROP with invalid properties, etc. It is recommended
to keep this set to 0 when doing any design optimization to speed up the analyis
and ensure the code does not crash. But the error checking can be used to determine
if there were any issues. A good design should not have any.
> If there are issues in the diffuser (efficiency is increasing, refprop errors, etc.)
then try changing the "Number of steps in the diffuser analysis". A good estimate
for number of steps is around 50, but it depends on the size of the compressor.
> If an error related to REFPROP exists, most likely the inputs include a design
which is no good. The error message may tell you what happened
(i.e. HSFLSH did not converge). Check the REFPROP manual for more information
on REFPROP errors(text file is included in the folder).
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Current Rotor Name: Sandia Compressor
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Working Fluid (Enter 1 to select, and 0 in others)
Air..................................................|1
Carbon Dioxide.......................................|0
Please Enter Your Conceptual Rotor Design Features:
Desired Pressure Ratio...............................|2.094
Compressor Rotational Speed [RPM]....................|14000
Mass Flow Rate [kg/s]................................|5.31
Inlet Total Temperature [K]..........................|288.0
Inlet Total Pressure [kPa]...........................|101.325
Rotor Tip Radius [m].................................|0.2
Length of Splitter Blade [m].........................|0
Blade Thickness at inlet [m].........................|0.00108
Blade Thickness at Tip [m]...........................|0.00108
Impeller Roughness...................................|0.000005
Tip Clearance [m]....................................|0.000372
Inlet Swirl Angle [deg]..............................|1.68
Inlet Curvature Rate [rad/m].........................|0
DIFFUSER ANALYSIS....................................|0
Diffuser Exit Radius [m].............................|0.0296
Diffuser Exit Width [m]..............................|0.001712036
VOLUTE ANALYSIS......................................|0
Volute Loss Factor...................................|0
Volute Exit Radius [m]...............................|0
Volute Exit Width [m]................................|0
COMPRESSOR PRELIMINARY DESIGN:
Please select your current design step:
*Step 1: Inlet/Outlet Dimensions*....................|0
OR
Inlet Hub Radius [zero] or [m].......................|0.045
Inlet Shroud Radius [zero] or [m]....................|0.09376
Outlet Blade Height [zero] or [m]....................|0.026
*Step 2: Number of Blades*...........................|0
OR
Number of Full Blades [zero] or [#]..................|20
Number of Splitter Blades [zero] or [#]..............|0
*(Optional) Inlet Condition Study*...................|0
Number of Steps in Design Studies....................|10
Number of Steps in Diffuser analysis.................|140
Error Checking.......................................|1