Question

In case your selection was a gasoline engine, evaluate the performance of a four-cylinder four-stroke engine that operates on the ideal Otto cycle and has a compression ratio of 11. At the beginning of the compression process, the air is at 90 kPa and 27°C, and 500 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Accounting for the variation of specific heats of air with temperature, determine the required power the engine will deliver at 3000 ??? then compare your answer if your selection is two strokes.

Answer #1

A four-cylinder, four-stroke engine is built
into an automobile. Within each cylinder of the engine, the
processes can be modeled as an air-standard Otto
cycle.
At the beginning of the compression process, the
cylinder volume is .559 L.
The temperature and pressure are 330 K and 1.5
bar, respectively. In the cycle, the maximum
temperature is 2200 K when the engine operates at
3000 RPM.
(4-stroke engine, 2 rotations per cycle, MW of air = 28.97
kg/kmol)
If the engine...

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...

chevy malibu uses gm ltg engine that has 4 cylinders. the
process within each cylinder of the engine can be modled as an air
standard otto cycle. at the beginning of the compression process
the cylinder volume is .559 L, the temperature and pressure are 330
k and 1.5 bar respectively the maximum temperature is the cycle
when the engine operates at 3000 rpm is 2200k. the engine
compression ratio is 9.5. determine air mass flow rate to the
engine,...

1) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected
2) An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the...

10) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected.
11)An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the pressure...

a six-cylinder four stroke automobile engine is being designed
to produce 75 kW at 2000 rpm with a bsfc of 300 g/kWh and a bmep of
12 bar. the engine is to have equal bore and stroke, and fueled
with gasoline with a heat of combustion of 44510 kj/kg. (a) what
should be the deisng displacement volume and bore? (b) what is the
fuel consumption per cycle per cylinder? (c) what is the brake
thermal efficiency?

A high performance 4 stroke supercharged gasoline engine is
being designed. The target specifications are as follows:
IMEP: 31 bar at peak power
bsfc: 233 g/kWh
isfc: 205 g/kWh
Bore to stroke ratio: 1..04
Number of cylinders: 4
Maximum mean piston speed: 24 m/s
Compression ratio: 10:1
Simulation results indicate that the indicated work per
cylinder per cycle needs to be 1400 J/cyl/cyc.
Based on the provided information, finalize the engine design
for the following parameters:
Bore and stroke (mm)...

A high performance 4 stroke supercharged gasoline engine is
being designed. The target specifications are as follows:
IMEP: 31 bar at peak power
bsfc: 233 g/kWh
isfc: 205 g/kWh
Bore to stroke ratio: 1..04
Number of cylinders: 4
Maximum mean piston speed: 24 m/s
Compression ratio: 10:1
Simulation results indicate that the indicated work per
cylinder per cycle needs to be 1400 J/cyl/cyc.
Based on the provided information, finalize the engine design
for the following parameters:
Bore and stroke (mm)...

A gasoline engine has a compression ratio of 9.00 and uses a gas
for which γ = 1.40.
(a) What is the efficiency of the engine if it operates in an
idealized Otto cycle?
%
(b) If the actual efficiency is 19.0%, what fraction of the fuel is
wasted as a result of friction and energy losses by heat that could
by avoided in a reversible engine? (Assume complete combustion of
the air-fuel mixture.)

Your new engine design consists of a piston cylinder
arrangement. The engine operates with mostly air and a small amount
of fuel. The system undergoes a cycle. The initial Pressure and
temperature are p1= 1bar and T1= 27°C. The system undergoes a power
cycle consisting of the following process:
Process
1-2
constant volume to a pressure, P2 of 4 bars
Process
2-3
expansion of pv=constant
Process 3-1
constant-pressure compression
Draw the system and pv diagrams
If P2 is 4...

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