1. ENGD3000 FINAL YEAR PROJECT
ALEKSANDRA MONIKA ZARZYCKA
P12224099
ACADEMIC YEAR 2015/16
SUPERVISOR DR JOHN GOW

2. What is a Stirling engine?
External combustion
engine
Works on regenerative
thermodynamic cycle
Converts the change of the
volume of the working gas
into a mechanical power

3. Adventages
Don’t produce
any exhaust
gasses
Can operate on
wide range of
heat sources
Fossil fuels can
be exchanged for
clean source
energy
Can be coupled
with motor
generator

4. Aims and objectives
Increase mechanical
efficiency
Adapt the design for
manufacture at the
university
Change the bell crank
mechanism to a simpler
solution
Incorporate generator into
the design

5. Compression
Heating
Expansion
Cooling
P
V
1
2 3
4
How does the Stirling Engine work?
A brief explanation of an ideal Stirling Cycle

6. Schmidt’s method
A numerical calculation of a thermal cycle based on an ideal gas law

7. Design choice
Original drawings were
issued in 1971 by a Dutch
engineer called
J. Coolegem.
As the technology has
progressed vastly through
the past 45 years, the
original design could be
verified by using
computerised methods.

8. 𝑥 = 𝑟 cos 𝜃 + 𝑙 cos 𝜑
𝑥 = 𝑟 cos 𝜃 + 90 + 𝑛 1 −
sin2 𝜃 + 90
𝑛2
Kinematics

9. Original Design
Bell crank
mechanism
Simple frame
Brass spirit
burner
Heat capturing
cover
New Design

10. Key design changes
Cylinder
Mount
Flywheel
Positioning
Plate
Crank
Carrier
Brace
Plate
Connecting
Rods
90 degree phase
Crank assembly

11. Prototype
Summary of testing process
Air leak
test
Use of different
lubricants
Testing different
pistons
PTFE
testing
Checking
components

12. Final test

13. Conclusions
Analysis of a thermodynamic cycle
Complete 3D design of an engine with
manufacturing drawings
Mechanical tests completed
Working prototype
Motor generator

14. ENGD3000 FINAL YEAR PROJECT
ALEKSANDRA MONIKA ZARZYCKA
P12224099
ACADEMIC YEAR 2015/16
SUPERVISOR DR JOHN GOW