You are a Mechanical Engineer working with ideal heat engines operating on the Otto and Diesel cycles. A client asks you to discuss the performance of internal combustion engines and presents you with two scenarios as follows: AIR STANDARD OTTO CYCLE: 1) The maximum and minimum temperatures are 1400°C and 15°C 2) The heat supplied per kilogram of air is 800 kJ. AIR STANDARD DIESEL CYCLE: 1) The maximum and minimum cycle temperatures are 1650°C and 15°C respectively 2) The maximum cycle pressure is 45 bar 3) The compression ratio is 15/1.
You are a
client asks you to discuss the performance of internal combustion engines and presents you with two
scenarios as follows:
AIR STANDARD OTTO CYCLE:
1) The maximum and minimum temperatures are 1400°C and 15°C
2) The heat supplied per kilogram of air is 800 kJ.
AIR STANDARD DIESEL CYCLE:
1) The maximum and minimum cycle temperatures are 1650°C and 15°C respectively
2) The maximum cycle pressure is 45 bar
3) The compression ratio is 15/1.
Write a report for the client, in which you:
a) Describe with the aid of diagrams the operational sequence of four stroke spark ignition and
four stroke compression ignition engines.
b) Explain the mechanical efficiency of two and four stroke engines.
c) Discuss and evaluate the performance of two stroke and four stroke diesel engines.
d) For the Otto cycle, calculate:
i The compression ratio
ii The cycle efficiency
iii The ratio of maximum to minimum pressures in the cycle.
e) For the diesel cycle, calculate:
i The cycle efficiency
ii The mean effective pressure
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