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OTTO_Cycle.pptx
- 1. COURSE TITLE: Thermal Engineering COURSE CODE: 19ME405 DEPARTMENT OF MECHANICAL ENGINEERING, SAVEETHA ENGINEERING COLLEGE. 1 Lecture on Ideal Thermodynamics Cycle
- 3. Ideal Thermodynamic Cycles • Air-standard analysis is used to perform elementary analyses of IC engine cycles. • Simplifications to the real cycle include: 1) Fixed amount of air (ideal gas) for working fluid 2) Combustion process not considered 3) Intake and exhaust processes not considered 4) Engine friction and heat losses not considered 5) Specific heats independent of temperature • The two types of reciprocating engine cycles analyzed are: 1) Spark ignition – Otto cycle 2) Compression ignition – Diesel cycle 3
- 4. 4 Air T C B C Qi n Qou t Isentropic Compression Process Const volume heat addition Process Isentropic Expansion Process Const volume heat rejection Process Otto Cycle A I R Combustion Products Ignition Intake Stroke FUEL Fuel/Air Mixture Compression Stroke Power Stroke Exhaust Stroke Actual Cycle
- 6. 6 2🡪3 Constant Volume Heat Addition 4 🡪 1 Constant Volume Heat Removal
- 7. 7 3 🡪 4 Isentropic Expansion Compression Ratio (r) 1 2 3 4 BDC TDC The ratio of the maximum to minimum volume in the cylinder of an internal combustion engine 1🡪2 Isentropic Compression
- 8. 8 Where, r is the compression ratio is adiabatic index
- 9. 9 Mean Effective Pressure It is that constant pressure which, if exerted on the piston for the whole outward stroke, would yield work equal to the work of the cycle. It is given by is heat added per kg (per unit mass) Where,
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