2. Strategies for Complete Expansion in I.C. Engine P M V Subbarao Professor Mechanical Engineering Department Achieve Maximum Work Output….

3. In 2000, a new engine is born... Three cylinder 5-Stroke engine Five Stroke Internal Combustion Engine : A new concept for internal combustion engines by Gerhard Schmitz, St.Vith 2011, Belgium

4. The Five Stroke Cycle The five-stroke cycle consists in the following steps: 1. Admission in the high pressure (HP) cylinder 2. Compression, followed by the ignition 3. First expansion of the burned gases 4. Second expansion of the burned gases 5. Exhausting of the burned gases.

5. Phase A : Intake in Hp Cylinder 1, Expansion in HP 2 & Exhaust in LP

6. Load Pressure Regulation of the 5-stroke cycle at 4000 rpm

7. Speed Vs Loading Pressure @ Max. Torque

8. Phase B : Compression + Combustion in HP 1, Expansion in LP & Transfer from HP 2

9. Explicit Numerical Integration For a crank rotation of 

10. Intake Valve Lift Diagram

11. Work Consumed by compression Process

12. In above Eq., the rate of the heat loss  Q loss /dθ is expressed as: The convective heat transfer coefficient is given by the Woschni model as Modeling of Combustion Process For combustion and expansion processes: C 1 =0.00324.

13. Dual Phase Combustion The rate of the heat input  Q gen /dθ (heat release)can be modeled using a dual Weibe function

14. Magnitude & Location of Peak Pressure

15. Phase C : Combustion + Expansion in HP 1, Intake in HP2 & Exhaust from LP

16. Work Delivered during Expansion in HP Cylinder

17. Phase D : Transfer from HP 1, Intake in HP 2 & Expansion in LP

18. Valve Lift Diagrams

20. Work Delivered during Expansion in LP Cylinder

21. Pressure/Volume diagram of 5-stroke cycle at 4000 rpm

23. BSFC of the 4- and 5-stroke engines at 4000 rpm

24. Net Work distribution at full load (100%) Frictional Losses : ~ 5%