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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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Steam

STEAM


Steam

  • STEAM means:

  • Steam Traction Engineering Analysis Method

  • It’s a bit corny, but at least it means something!


Steam

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


Steam

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”


Steam

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.


Steam

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.


Steam

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”


Steam

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.


Steam

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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