Question
In: Mechanical Engineering
An ideal Otto engine has a compression ratio of 10 and uses air as the working...
An ideal Otto engine has a compression ratio of 10 and uses air as the working fluid. The state of air at the beginning of the compression process is 100 kPa and 27 0C. The maximum temperature in the cycle is 2100K. (R=0.287 for air) (using variable specific heat)
- Draw the P-v diagram of the Otto cycle
- Determine the specific internal energies at the beginning and the end of the compression,
- Determine the specific internal energies before and after the expansion
- Determine the specific heat input, heat rejection and net-work output.
- Determine the thermal efficiency.
- If the amount of air in one cylinder at the beginning of compression is 500 cm3, how much power can the engine deliver for an 8 cylinder engine running at 2000rpm?
Solutions
samet mamat answered 1 year agoRelated Solutions
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An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 7. At the
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temperature (T3) at the end of the heat addition process, (b) the
net work output, (c) the thermal efficiency and (d) the mean
effective pressure for the cycle. Use the IG model
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8. At the
beginning of the compression process, air is at 95 kPa and 27°C,
and 900 kJ/kg of heat is transferred to air during the
constant-volume heat-addition process. Taking into account the
variation of specific heats with temperature, determine
(a) the pressure and temperature at the end of the
heat-addition process, (b) the net work output,
(c) the thermal efficiency, and (d) the mean
effective pressure for the cycle
An ideal Otto cycle has a compression ratio of 8.5 At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8.5 At the
beginning of the compression process, air is at 98 kPa and 27∘C, If
the Tmax cannot exceed 2300K and 3e-5 kg of. assuming constant
specific heats at ambient temperature, determine (a) the pressure
and temperature at the end of each process. (b) the net work
output, (c) the thermal efficiency, and (d) the mean effective
pressure for the cycle.
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8. At the
beginning of the compression process, air is at 95 kPa and 27°C,
and 730 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. The gas constant of
air is R = 0.287 kJ/kg·K.
Determine:
(a) the pressure and temperature at the end of the heat addition
process
(b) the net work output
(c) the thermal...
An Otto cycle having a compression ratio of 7:1 uses air as the working fluid. Initially...
An Otto cycle having a compression ratio of 7:1 uses air as the
working fluid. Initially p1 = 95 kPa,
T1 = 17 C, and V1 = 0.0038 m
3
. During the heat addition process, 7.5 kJ of heat are
added.
Determine:
(a) the heat rejected Q4-1 = __________ kJ
(b) the net work of the cycle Wnet = ________________ kJ
(c) the cycle thermal efficiency η = ________ %
(d) the mean effective pressure. MEP = __________ kPa
The compression ratio is 10 in the air standard Otto cycle. Pressure at the beginning of...
The compression ratio is 10 in the air standard Otto cycle.
Pressure at the beginning of the compression stroke is 1XY kPa and
the temperature is 15 ºC. The heat transfer to the air for each
cycle is 18XY kJ / kg air. Draw the T-s and P-v diagrams. (x=9
y=8).
Note: Accept that specific temperatures do not change with temperature. Take k = 1.4 and Cp = 1.0031 kJ / kg-K.
a)
For question 1, we draw the temperature...
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