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STEAM - PowerPoint PPT Presentation


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STEAM. STEAM means: S team T raction E ngineering A nalysis M ethod It’s a bit corny, but at least it means something!. What is it? A spreadsheet which can be used to predict: Locomotive Performance: Indicated Output Wheel Rim Output Drawbar Output Steam Consumption

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Presentation Transcript
slide2
STEAM means:
  • Steam Traction Engineering Analysis Method
  • It’s a bit corny, but at least it means something!
slide3
What is it?

A spreadsheet which can be used to predict:

  • Locomotive Performance:
    • Indicated Output
    • Wheel Rim Output
    • Drawbar Output
    • Steam Consumption
  • Indicator Diagrams
  • Exhaust Conditions
slide4
Origins
  • Started as a means for assessing forces acting on the locomotive frame.
  • Evolved to include additional parameters (e.g. steam properties, speed).
  • Still “Work in Progress”
slide5
How it Works
  • Calculates what happens through one complete wheel revolution in 1 Degree increments.
  • Uses inputs (valve events, steam chest pressure, cut-off) to generate an Indicator Diagram.
  • Calculates net piston force, forces on axleboxes, torque at driving axle, tractive effort and work done through the wheel revolution.
  • Inclusion of a speed parameter allows indicated power to be calculated.
  • Steam properties allow steam consumption to be calculated.
  • Resistance formula allow wheel rim and drawbar outputs to be found.
slide6
New Features on Version 4d
  • Use of embedded steam tables.
  • Improved method of calculating steam consumption.
  • A “Generation Steam” Factor which allows locomotives with poorer front end design to be analysed.
  • Exhaust Steam temperature calculation.
  • Revised resistance calculation.
slide7
Validation

Results compared with data from:

  • The “Red Devil”
  • Rugby Testing Station results
  • Swindon test plant results
  • Other data from Holcroft / Chapelon etc.
  • Dr Pawson’s work with “perform”

Results typically within +/- 5% of Rugby Data and the “Red Devil” (with exceptions!)

IHPs comparable to “perform”

slide8
Potential
  • A quick and easy to use (once you know it!).
  • A simple method by which design changes can be assessed.
  • A tool by which locomotive designs can be optimised.
  • Calculations are accessible – easy to fudge and look at “what if” scenarios.
  • Can be used to assess compounds.
slide9
Future Developments
  • Boiler and Draughting calculations based on FDCs.
  • Inclusion of reciprocating mass calculation.
  • Provision for additional cylinders.
  • Model the entire locomotive!
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