(b) Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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just b

Scenario 1
A spark ignition engine that operates on an ideal Otto cycle has a compression ratio of 8. At the
beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred
to air during the constant-volume heat-addition process. Take into account the variation of specific
heats with temperature.
Task 1
(a) Describe with the aid of diagrams the operational sequence of four stroke spark ignition
engines.
(b) Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines
(c) Determine the pressure and temperature at the end of the heat- addition process
(d) Find the net-work output, the thermal efficiency, and the mean effective pressure for the
cycle.
(e) Generate plot(s) for thermal efficiency, n vs compression ratio.
Transcribed Image Text:Scenario 1 A spark ignition engine that operates on an ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. Task 1 (a) Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines. (b) Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines (c) Determine the pressure and temperature at the end of the heat- addition process (d) Find the net-work output, the thermal efficiency, and the mean effective pressure for the cycle. (e) Generate plot(s) for thermal efficiency, n vs compression ratio.
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