Thermal Engineering Unit - I & II . ppt

GAS POWER CYCLES
Cycles: Otto, Diesel, Dual, Brayton - Calculation of mean effective pressure - Air standard efficiency - Comparison of cycles
INTERNAL COMBUSTION ENGINES
Classification - Components and their function - valve timing diagram and port timing diagram - actual and theoretical p-v diagram of two stroke and four stroke engines – carburettor - diesel pump and injector system - battery and magneto ignition system - principles of combustion and detonation in CI engines - lubrication and cooling systems - performance parameters and calculations.

1. COMPARSION OF OTTO, DIESEL & DUAL CYCLE

2. BRAYTON CYCLE WITH INTER COOLING

3. BRAYTON CYCLE WITH REHEATER

4. BRAYTON CYCLE WITH INTER COOLER, REHEATER &
REGENERATION

5. TWO STROKE S.I ENGINE
TWO STROKE C.I ENGINE

6. FOUR STROKE S.I ENGINE
FOUR STROKE C.I ENGINE

7. ENGINE COMPONENETS AND FUNCTIONS

8. FOUR STORKE (PETROL) S.I. ENGINE

9. VALVE TIMING DIAGRAM

10. FOUR STORKE (DIESEL) C.I. ENGINE
VALVE TIMING DIAGRAM

11. TWO STORKE (PETROL) S.I. ENGINE
PORT TIMING DIAGRAM

12. TWO STORKE (DIESEL) C.I. ENGINE
PORT TIMING DIAGRAM

13. CARBURETTOR
1.0 SIMPLEX CARBURETTOR

14. 2.0 SOLEX CARBURETOR
a.Floatcircuitb.Startingcircuitc.Idlingorslowspeedcircuit
d.Normalrunningcircuite.Accelerationcircuit

15. a. Float circuit b. Starting Circuit

16. c. Idling or slow speed circuit d. Normal running Circuit

17. e.Accelerationcircuit

18. DIESEL PUMP (CAV Fuel Injection Pump)

19. FUEL INJECTOR

20. MULTI POINT FUEL INJECTOR (MPFI)

22. BATTERY IGNITION (or) COIL SYSTEM

23. MAGNETO IGNITION SYSTEM

24. COOLING SYSTEM
1.0Aircoolingsystem

25. a. Thermosyphon b. Pump circulation
2.0Watercoolingsystem
3.0THERMOSTAT incoolingsystem
Athermostatvalveisusedinthewatercoolingsystemtoregulatethecirculationofwaterin
systemtomaintainthenormalworkingtemperatureoftheenginepartsduringtheoperating
conditions.

26. LUBRICATION SYSTEM
1.0PetroilorMistlubricationsystem
About3to6%oflubricatingoilismixedwithpetrolinthefueltank.
Maindisadvantages,
Idlerunningtheoilwillgetseparatedandcausecloggingoffuelpassageincarburetor
.
Moreoil-willreleasemorecarbondepositsinthecylinder
Lessoil–insufficientlubricationcausedamagetotheengine.

27. LUBRICATION SYSTEM
2.0Wetsumpsystem
Lubricationoilisstoredintheoilsump.
a)Gravitysystem b)Splashsystem

28. LUBRICATION SYSTEM
2.0Wetsumpsystem
Lubricationoilisstoredintheoilsump.
c)Pressuresystem

29. LUBRICATION SYSTEM
3.0Drysumpsystem
d)Semipressuresystem
Lubricationoilisnotkeptinstoredintheoilsump.Oiliscarriedinaseparatetankandfedto
theengine.