S.I engines
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This document discusses spark ignition engines. It covers mixture requirements, fuel injection systems, stages of combustion including normal and abnormal combustion like knocking. Knocking occurs when pockets of air-fuel mixture explode outside of the normal combustion front. Factors that affect knocking include density factors, time factors, and composition factors. The document also discusses combustion chambers and their role in smooth engine operation and high power output.
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The fuel-air cycle provides a more accurate model of the actual thermodynamic cycle in an internal combustion engine compared to the air standard cycle by accounting for:
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1. Combustion involves the rapid chemical combination of fuel and oxygen, resulting in heat release. It requires a combustible mixture, an ignition source, and flame propagation.
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Concentric springs, surge phenomenon in spring, helical torsion, spiral spring
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This document discusses combustion in compression ignition (CI) engines. It describes the four stages of combustion: ignition delay, premixed combustion, mixing-controlled combustion, and late combustion. It also discusses factors that affect ignition delay such as injection timing and quantity, intake air temperature and pressure, and fuel ignition quality as measured by cetane number. CI engines can be direct injection or indirect injection, with direct injection engines having the fuel injected directly into the cylinder and indirect injection engines using a prechamber.
Ci engine combustion by Akhileshwar Nirala
In a compression ignition (CI) engine, fuel is directly injected into the cylinder and spontaneously ignites when mixed with hot, compressed air. Combustion occurs in four stages: ignition delay, premixed combustion, mixing-controlled combustion, and late combustion. There are two main types of CI engines - direct injection engines which inject fuel directly into the chamber, and indirect injection engines which inject fuel into a prechamber before entering the main chamber. Factors like injection timing and quantity, intake conditions, and fuel properties can affect the ignition delay period.
compression egnition engine engine
The document summarizes the combustion process in internal combustion engines. It discusses four stages of combustion: 1) ignition delay period, where fuel is transformed into vapor and mixed with air before ignition; 2) uncontrolled combustion, where accumulated fuel burns rapidly once ignition begins; 3) controlled combustion, where the combustion rate matches the fuel injection rate; and 4) after burning of residual fuel. Factors like injection timing and fuel properties affect the ignition delay period. The combustion chamber design must provide efficient fuel-air mixing and heat distribution to achieve smooth combustion.
ATD CI ENGINE COMBUSTION PHENOMENON UNIT-3 PPT.ppt
Combustion in compression ignition (CI) engines occurs in four stages:
1. Ignition delay period, as the injected fuel vaporizes and mixes with air.
2. Uncontrolled combustion, as accumulated fuel from injection ignites rapidly.
3. Controlled combustion, as combustion rate matches fuel injection rate.
4. After burning of any residual fuel.
Factors like compression ratio, injection timing and pressure, and fuel properties can affect the ignition delay period. Abnormal combustion or "knocking" may occur if ignition delay is too long, resulting in rapid uncontrolled combustion. Proper combustion chamber design is important for efficient mixing of fuel and air.
ATD CI ENGINE COMBUSTION PHENOMENON UNIT-3 PPT (1).ppt
Combustion in compression ignition (CI) engines occurs in four stages:
1. Ignition delay period, as the injected fuel vaporizes and mixes with air.
2. Uncontrolled combustion, as accumulated fuel ignites rapidly in a steep pressure rise.
3. Controlled combustion, as the burning rate matches injection rate for maximum heat release.
4. After burning of any residual fuel.
Factors like compression ratio, injection timing and pressure, and fuel properties can affect the ignition delay period. Abnormal combustion or "knocking" may occur if ignition delay is too long, resulting in a large uncontrolled combustion phase. Proper combustion chamber design is important for efficient mixing of fuel and air.
Ci engine combustion chamber
The document discusses the stages of combustion in compression ignition (CI) engines. It describes the four stages as: 1) ignition delay period, 2) rapid combustion period, 3) controlled combustion period, and 4) after-burning period. It also discusses factors that affect the ignition delay period such as compression ratio, engine speed, fuel properties, and intake conditions. The document covers knocking in CI engines and the different types of combustion chambers used.
Training report on Diesel Engine's component Engine head
This document provides an overview of diesel engine components and terminology. It discusses the purpose, working principle, classification, and history of diesel engines. The key components described include the engine block, crankshaft, pistons, connecting rods, cylinder liners, cylinder head, camshaft, valves, fuel system, and air system. Terminology explained includes top dead center, bottom dead center, compression ratio, indicated power, brake power, and efficiency. Piping systems of ships are also mentioned as a related topic.
ICE_22_Chapter 4.v2.ppt
This document summarizes key aspects of spark ignition engines discussed in Chapter 4, including:
1. Methods of mixture preparation such as carburetion and various fuel injection systems. Carburetion uses venturi tubes to mix fuel and air while injection systems can more precisely meter fuel amounts.
2. Factors that cause cyclic variations in engine performance like variations in mixture motion, composition, temperature and residual gases between cycles.
3. The combustion process in cycles, characterized by the mass fraction burned at different crank angles and the relationship between flame development and propagation periods.
4. Testing procedures for measuring engine emissions using the Federal Test Procedure involving sampling at different points in the driving cycle.
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S.I engines
- 2. UNIT-I SPARK IGNITION ENGINES Mixture requirements – Fuel injection systems – Monopoint, Multipoint & Direct injection - Stages of combustion – Normal and Abnormal combustion – Knock - Factors affecting knock – Combustion chambers.
- 3. Air-fuel ratio or Mixture requirements
- 4. Air-fuel ratio or Mixture requirements
- 5. Variation of Power output , BSFC with A/F ratio.
- 6. Automotive A/F ratio requirements
- 7. Carburetor
- 11. Normal Combustion Under ideal conditions the common internal combustion engine burns the fuel/air mixture in the cylinder in an orderly and controlled fashion.
- 12. Abnormal Combustion When unburned fuel/air mixture beyond the boundary of the flame front is subjected to a combination of heat and pressure for a certain duration (beyond the delay period of the fuel used), detonation may occur. Detonation is characterized by an instantaneous, explosive ignition of at least one pocket of fuel/air mixture outside of the flame front. A local shockwave is created around each pocket and the cylinder pressure may rise sharply beyond its design limits.
- 13. Knocking Knocking (also called knock, detonation, spark knock, pinging or pinking) in spark- ignition IC engine occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. The fuel-air charge is meant to be ignited by the spark plug only, and at a precise point in the piston's stroke. Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the 4 stroke cycle. The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive.
- 14. Factors affecting knock 1. Density Factors
- 16. 2. Time Factors
- 17. 2. Time Factors
- 19. Variables affecting Knocking in Si engine.
- 21. Combustion Chambers 1. Smooth Engine Operation
- 22. Combustion Chambers 2. High Power Output and thermal Efficiency
- 23. Combustion Chambers Typical Combustion Chamber
- 24. Combustion Chambers Typical Combustion Chamber
- 25. Combustion Chambers Typical Combustion Chamber