A gasoline engine receives air at 10C 100 kPa, having a compression ratio of 9:1 by volume. The heat addition by combustion gives the highest temperature as 2500 K. Use cold air properties to find the highest cycle pressure, the specific energy added by combustion, and the mean effective pressure. Otto CycleIdeal Gas Model used with specific heats as f(T)STATE POINTS1 - Compression In2 - Combustion Begin3 - Expansion Begins4- Expansion Ends5- Compression InPROCESSESCompressionCombustionPower StrokeHeat RejectionEtaP [kPa]100.02167.47946.3Uin [kJ/kg]0.00.00.00.0CR=T[°C]10.0408.72226.8T[K]9283.2681.92500.01083.1Uout [kJ/kg] Q [kJ/kg]0.00.00.00.0Sums =v [m³/kg] s [kJ/kg-K] u [kJ/kg]0.81260.0813W [kJ/kg]

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A gasoline engine receives air at 10C 100 kPa, having a compression ratio of 9:1 by volume. The heat addition by combustion gives the highest temperature as 2500 K. Use cold air properties to find the highest cycle pressure, the specific energy added by combustion, and the mean effective pressure.

Otto Cycle
Ideal Gas Model used with specific heats as f(T)
STATE POINTS
1 - Compression In
2 - Combustion Begin
3 - Expansion Begins
4- Expansion Ends
5- Compression In
PROCESSES
Compression
Combustion
Power Stroke
Heat Rejection
Eta
P [kPa]
100.0
2167.4
7946.3
Uin [kJ/kg]
0.0
0.0
0.0
0.0
CR=
T[°C]
10.0
408.7
2226.8
T[K]
9
283.2
681.9
2500.0
1083.1
Uout [kJ/kg] Q [kJ/kg]
0.0
0.0
0.0
0.0
Sums =
v [m³/kg] s [kJ/kg-K] u [kJ/kg]
0.8126
0.0813
W [kJ/kg]

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