1. Basic Sketch Of Motor How Do We Describe The Physics Of Operation?
How Much Power Will It Make With R&D’s Steam Source?
Inlet Port
Exhaust
Port
Side View

2. Basic Piston Expander Design Rear View
Bore
½ Stroke
Basic Kinematics
Linkage

3. Piston Engine Kinematicsx θ φ
Rod length l
½ Stroke r

4. Power Transmission FBD Of Pistonφ
F Rod
F Side Fp

5. Torque Developed From Rod Loading On Crankshaft
F Rod
F Side Fp
F Side
F Gas r

6. How Do We Evaluate Cylinder Pressure To Obtain Power?
Thermodynamics Portion Of The Analysis
Need To Make Some Basic Simplifying Assumptions:
Consider The Cylinder The Control Volume
First Pass Assume No Heat Transfer
Adiabatic – No Heat Transfer
Reversible Process - Isentropic
Simple Valve Operation

7. Thermodynamic Analysis
Assuming A Closed Adiabatic System:
Ideal Gas Behavior
Simple Valve Operation

8. Engine Thermodynamics What’s Happening In The Cylinder?
1 Intake Opens
2 Top Dead Center
3 Intake Closes
3-4 Adiabatic Expansion
4 Exhaust Opens
5 Bottom Dead Center
6 Exhaust Closes 2 3 4 5 1
Cylinder
Pressure
Volume 6

9. Next Steps
Utilize The Kinematics and Thermodynamics To Complete Simulation Provided On Web Site
Simulation Will Evaluate:
Output Torque
Component Loading
Cylinder Pressures and Temperatures
Utilize Component Loading In Stress Analysis Of Various Parts

10. Assemblies / Family Tree’s
Assemblies And Sub Assemblies Should Reflect The Assembly Process
The Lower Level Parts Should Reflect The Assembly They Are Used On
The Family Tree Is A Graphical Representation Of The Parts Used In The Assembly And How They Are Assembled

11. Family Tree