·An Sl engine is modelled with an Otto cycle and operated at part throttle. The air-fue with AF = 15 enters the cylinders at 75 kPa and 58°C. The compression ratio r. = 9.5:1, the exhaust pressure constant volume specific heat c, = 0.821 kJ/kg-K, the specific heat ratio k = 1.35, the gas constant of air R = 0.287 kJ/kg-K, and combustion efficiency n. assumed that there is no exhaust residual. Calculate the temperature in cylinder at start of combustion [°C] (Express your answer as an integer). = 100 kPa, the heating value Qay = 43,000 kJ/kg, the %3D 96%. It can be

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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The figure opposite shows the cycle of a four-stroke, SI, naturally aspirated engine at
part throttle. At part throttle, the intake stroke pressure will be some constant value
lower than one atmosphere.
· The exhaust stroke pressure is assumed
constant at 1 atmosphere.
· The work done during the intake stroke is:
W. -1 = P; (V-V6) = P;Va
· The work done during the exhaust stroke is:
Ws-6 = Pex (Vs-V6) = -PexVa
The net indicated pumping work:
3
(3-9)
(3-10)
Wpump = (P – Pex)Va
(3-11)
Question 1
· An Sl engine is modelled with an Otto cycle and operated at part throttle. The air-fuel
with AF = 15 enters the cylinders at 75 kPa and 58°C. The compression ratio r. =
9.5:1, the exhaust pressure = 100 kPa, the heating value QHv = 43,000 kJ/kg, the
constant volume specific heat c, = 0.821 kJ/kg-K, the specific heat ratio k = 1.35, the
gas constant of air R = 0.287 kJ/kg-K, and combustion efficiency n. =
assumed that there is no exhaust residual. Calculate the temperature in cylinder at
start of combustion [°C] (Express your answer as an integer).
96%. It can be
2 O7
Transcribed Image Text:The figure opposite shows the cycle of a four-stroke, SI, naturally aspirated engine at part throttle. At part throttle, the intake stroke pressure will be some constant value lower than one atmosphere. · The exhaust stroke pressure is assumed constant at 1 atmosphere. · The work done during the intake stroke is: W. -1 = P; (V-V6) = P;Va · The work done during the exhaust stroke is: Ws-6 = Pex (Vs-V6) = -PexVa The net indicated pumping work: 3 (3-9) (3-10) Wpump = (P – Pex)Va (3-11) Question 1 · An Sl engine is modelled with an Otto cycle and operated at part throttle. The air-fuel with AF = 15 enters the cylinders at 75 kPa and 58°C. The compression ratio r. = 9.5:1, the exhaust pressure = 100 kPa, the heating value QHv = 43,000 kJ/kg, the constant volume specific heat c, = 0.821 kJ/kg-K, the specific heat ratio k = 1.35, the gas constant of air R = 0.287 kJ/kg-K, and combustion efficiency n. = assumed that there is no exhaust residual. Calculate the temperature in cylinder at start of combustion [°C] (Express your answer as an integer). 96%. It can be 2 O7
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