Question

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 compression ratio is 9.5**,
determine

(a) the air mass flow rate to the engine in g/s.

(b) the heat addition to the engine in kW.

(c) the net work of the engine in kW.

(d) the thermal efficiency of the engine in %.

(e) the mean effective pressure of the engine in bar.

Answer #1

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,...

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...

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?

1. An eight-cylinder, two stroke cycle diesel engine with 13.6
cm bore and 16.1 cm stroke produces 97 kW of brake power at 2800
RPM. Compression ratio rc = 15.5:1
Calculate:
* a) Engine displacement [m3 and cm3]
* b) Torque [N-m]
* c) Brake mean effective pressure [kPa]
* d) Clearance volume of one cylinder [m3 and cm3]

A gas engine working on a four stroke cycle has a cylinder of
250 mm diameter, length of stroke 450 mm, and is running at 180
rpm. Its mechanical efficiency is 80% when the mean effective
pressure is 0.65 MPa. The friction power is?
Need the answer immediatley.

A Jaguar XK8 convertible has an eight-cylinder engine. At the
beginning of its compression stroke, one of the cylinders contains
498 cm3 of air at atmospheric pressure (1.01×105Pa) and a
temperature of 27.0 ?C. At the end of the stroke, the air has been
compressed to a volume of 46.4 cm3 and the gauge pressure has
increased to 2.80×106 Pa . Compute the final temperature.

It has a 2000 cm ^ 3 4-stroke Diesel engine built with a
compression ratio of 22 and operates with a 1.8 cutoff ratio:
initial T= 25 °C
p=100[kpa]
Questions:
1.Maximum cycle temperature
2. total work in cycle (KJ / rev)
3.Theoretical power that delivers if it rotates at 2300 rpm
4 Draw p-v and T-S diagram for the cycle

Consider a cold air-standard Diesel cycle. At the beginning of
compression, 102 kPa, and 300 K. The mass of air is 0.120 kg, the
compression ratio is 16, and the cut-off ratio is 2.0
For a cold air-standard analysis use the following values: cp =
1.005 kJ/kgK, cv = 0.718 kJ/kgK, k=1.40, M=28.97 kg/kmol.
Determine the following :
(a) pressure at end of compression stroke, in kPa
(b) temperature at end of compression stroke, in K
(c) maximum temperature in...

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)...

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