ME438 Programs

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ME438 Programs

• byDr. Christopher Depcik
• October 28, 2005

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Two Programs

• Adiabatic Flame Temperature Program
• Constant Volume and Constant Pressure
• Thermodynamic Cycle Simulation
• Ideal Gas or Fuel-Air Combustion
• Constant Volume, Constant Pressure or Limited
  Pressure
• With or Without Intake and Exhaust
• Windows Based with Post-Processing Included

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Adiabatic Flame Temperature Program

• Description of the Program is Available at
  http//www.depcik.com/eduprograms/aftp.htm

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Thermodynamic Cycle Simulation
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Input

• Can Enter Through Forms, Menu or All Input Screen
• Suggest Entering in Following Order
• Thermodynamic Cycles button
• Select Cycle Type and Working Fluid
• Cycles Parameters button and enter data
• Working Fluid Specification button and enter data

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Thermodynamic Cycles Available

• Constant Volume
• Constant Pressure
• Limited Pressure
• Constant Volume with Intake and Exhaust
• Constant Pressure with Intake and Exhaust
• Limited Pressure with Intake and Exhaust

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Working Fluid Type

• Hit Working Fluid Specification Button
• Ideal Gas with Constant Specific Heats
• Fuel-Air Combustion
• Need to link to thermodynamic datafile
  (thermodata.cyd)
• Full equilibrium option and can freeze species
  after combustion

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Global Parameters

• Parameters Used for Display and Calculation
  Purposes
• Increase Number of Points for better looking
  graphs
• Newton-Raphson parameters used in case simulation
  gives erroneous results
• Increase Slope Divider and Max Iterations
• Ex For a CV Nitromethane process you need to
  increase these values (see T-S Plot)

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Use All Input Window

• Reachable Through Input Menu
• Can Adjust all Run-Time Parameters
• Should dynamically update when selecting Cycle
  Type and Working Fluid

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Main Program Save and Open

• Under File Menu
• Save Current Configuration (Save)
• Use Open to retrieve this file
• Save With Run Results (Save with Run Results)
• Use Open with Run Results to retrieve this file

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Output

• Reachable Through Output Menu
• Process Parameters state variables, work, heat,
  efficiencies, etc
• Thermodynamic Graphs Pressure vs. Volume,
  Temperature vs. Entropy, etc
• Performance Graphs Efficiency, Work, IMEPn/p1,
  IMEPn/p3, etc
• Can Save
• Data and Images

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Process Parameters

• Copy and Paste Available
• Use mouse to highlight or Ctrl A selects all
  text
• Ctrl C copies (or use menu) and use Ctrl V to
  paste in Word, Excel, etc
• Menu Save
• Tab-delimited text-based file

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Thermodynamic Graphs

• Use x-axis and y-axis lists to select graphs to
  plot
• Save Data
• Tab or Comma-Space delimited
• Save data for individual graph pictured
• Save All Graphs data for all graphs
• Provide common name
• tmp.csv becomes tmp_pV.csv
• Save As Image
• JPEG or PNG image
• Right-click mouse on graph for GUI that adjusts
  graph image
• Go to ChartGroupsData to view the actual plot
  data

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Performance Graphs

• See Previous Slide for Options

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Help Menu

• If Connected to Internet can Reach Cycles
  Webpage, Feedback Form and Bug Submission

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Disclosure

• I understand that there will be some bugs in the
  program and things may go awry every once and a
  while. Please be patient with the program as I
  have programmed all of the code and visual
  aspects myself which took a lot of time
  independent of my actual work (i.e. what I get
  paid for). I hope that you enjoy the program and
  it makes your life a little easier ?
• Sincerely,
• Chris