Engine Combustion and Pollution Control
Course objective
At the end of the course, the student shall be able to understand
- Actual cycle process and its calculation
- Various performance characteristics
- Nature of air pollutants produced by automobile vehicles and its effect on health and environment
- Methods of emission control, emission control devices
- Fuels and its chemical reaction in combustion (5 hours)
- Fuel structure and composition
- Properties of fuel
- Chemical reactions in fuel combustion
- Combustible mixture and products of combustion
- Heating value of fuel and mixture
- Heat capacity of charge and combustion products
- Intake and compression in engines (4 hours)
- Differences in theoretical and actual cycles
- Intake
- Admission parameters
- Intake coefficient
- Factors affecting intake coefficient
- Compression
- Pressure and temperature at the end of compression
- Effect of various parameters on combustion
- Combustion in SI engines (5 hours)
- Mixture formation
- Ignition limits
- Combustion: chemistry, types, stages and flame propagation
- Rate of pressure rise and phases of combustion
- Effect of operating variables on: process of combustion, flame propagation, ignition lag
- Auto ignition and chemical reaction
- Detonation: phenomenon, knocking, measurements, intensity, effect of engine variables and engine design
- Factors governing combustion
- Combustion chamber and its types
- Combustion in CI engines(4 hours)
- Direct and indirect combustion chamber
- Importance of air motion swirl, squish and turbulence-swirl ratio
- Fuel air mixing
- Stages of combustion
- Delay period and operating variables affecting delay period
- Detonation: phenomenon, knocking, measurements, intensity, effect of engine variables and engine design
- Factors governing combustion
- Combustion chamber design
- Expansion and exhaust (2 hours)
- Expansion
- Effect of various parameters on polytropic expansion
- Exhaust
- Characteristics of motor vehicle engine(6 hours)
- Indicated characteristics
- Brake characteristics
- Effect of various operating variables on indicated and brake characteristics
- Speed characteristics
- Load characteristics
- Adjustment characteristics
- Special characteristics
- Vehicular emission(6 hours)
- Sources of pollutants: exhaust gases, crankcase gas and fuel vapour
- Composition of exhaust gases
- Pollutant formation
- Effect of composition and structure of fuels on emission
- Effect of air-fuel mixture, operating variables, combustion chamber design, driving conditions and drivability, traffic management on emission
- Effect of fuels and exhaust gases on human health and environment
- Methods of exhaust gas analysis (5 hours)
- Colourimeter
- Gas chromatograph
- Smoke meter
- Particulate measurement
- Odor and aldehyde emission
- Exhaust gas analyzer
- Flame ionization detectors
- Chemiluminescence NOx analyzer
- Non dispersive infrared (NDIR) analyzer
- Methods of emissions control(6 hours)
- Emission standard and emission control norms, euro emission standards
- Improving fuel system and ignition system of engines
- Use of alternative fuels and additives
- Use of neutralizer (flame, liquid and catalytic) in the exhaust system
- Emission control system: exhaust gas recirculation (EGR), evaporative emission control (EVAP), positive crankcase ventilation (PCV), air injection system (AIS)
- Closed loop control
- Change in air fuel ratio and ignition timing
- Vehicular noise pollution(2 hours)
- Sound level
- Sources, effects and control methods
- Technical norms and standards
Practical
- Measurement of indicated and brake characteristics
- Measurement of speed and load characteristics
- Sound level measurement
- Tailpipe emission testing
- Assignments on calculation of actual cycle of SI and CI engines
References
- P. L. Ballaney, Internal combustion engines, Khanna Publishers, Delhi.
- V. Arkhangelsky, M. Khovakh, Y. Stepanov, V. Trusov, M. Vikhert, A. Voinov, Motor vehicle engines, Mir publishers, Moscow.
Evaluation scheme
The questions will cover all the chapters of the syllabus. The evaluation scheme will be as indicated in the table below:
Chapter |
Marks* |
1 & 2 |
16 |
3 & 4 |
16 |
5 & 6 |
16 |
7 & 8 |
16 |
9 & 10 |
16 |
Total |
80 |
*Note: There may be minor deviation in mark distribution
|