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Advantages and Disadvantages of Various Internal Combustion Engines

This lecture (MT.313.IC.ENGINES.NO.03) covers the key advantages and disadvantages of different internal combustion engines, including four-stroke, two-stroke, petrol, diesel, and Wankel engines. It discusses their performance parameters, working principles, and various ideal cycles, emphasizing their efficiency and operational characteristics. Additionally, the comparison between two-stroke and four-stroke engines provides insights into their functionalities. The lecture aims to clarify the practical applications and theoretical foundations of these engine types.

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Advantages and Disadvantages of Various Internal Combustion Engines

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  1. MT 313 IC ENGINES LECTURE NO: 03 (19 Feb, 2014) Khurram engr014@yahoo.com Yahoo Group Address: ICE14

  2. QUESTIONS • What is the advantages and Disadvantages of four stock engines? • What is the advantages and Disadvantages of two stock engines? • What is the advantages and Disadvantages of Petrol engines? • What is the advantages and Disadvantages of Diesel engines? • What is the advantages and Disadvantages of Wankelstock engines? • Compare 4 - stroke & 2 - stroke Engine?

  3. QUESTIONS • Describe working principles of Wankel engines? • Numerate performance parameters of the I.C. engines?

  4. Ideal cycles are simplified

  5. Ideal Cycles • More realistic than Carnot cycle. • Internally reversible but not totally. • Idealizations: • No friction • Expansions and compressions – quasi-equilibrium • Heat transfer is negligible

  6. Different Processes Isobaric Isometric Isothermal ΔT = 0 but Q ≠ 0 Adiabatic ΔT ≠ 0 but Q = 0 Cyclic If clockwise – heat engine If counterclockwise – heat pump

  7. Area inside the cycle represents net work out for TS or PV diagrams.

  8. Otto Cycle, ideal for spark ignition engines

  9. TS plot of the Otto Cycle

  10. Efficiency vs Compression Ratio Higher ratios produce autoignition and knocking

  11. Efficiency vs ratio of specific heats He Air Combustion mixture

  12. The Ideal Otto Cycle

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