Question
In: Mechanical Engineering
a)State the ideal cycle most appropriate to the actual operations undergone the modem Diesel engine ....
a)State the ideal cycle most appropriate to the actual
operations undergone the modem Diesel engine .
b)give reasons why the actual cycle is made approximate to the
ideal heat exchange process.
c) state how the combustion process in the actual cycle is
made approximate to the ideal heat exchange process.
Solutions
samet mamat answered 2 years agoRelated Solutions
A Diesel cycle engine is analyzed using the air standard method. Given the conditions at state...
A Diesel cycle engine is analyzed using the air standard
method. Given the conditions at state 1, compression ratio (r), and
cutoff ratio (rc) determine the efficiency and other values listed
below.
Note: The gas constant for air is R=0.287
kJ/kg-K.
Given Values
T1 (K) = 338
P1 (kPa) = 130
r = 14.5
rc = 1.25
a) Determine the specific internal energy (kJ/kg) at state
1.
b) Determine the relative specific volume at state 1.
c) Determine the relative...
At the beginning of compression of an ideal Diesel cycle the gas has a temperature and...
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kN/m2, respectively. The volume ratio of compression is
16:1. The maximum temperature of the cycle is 14000C.
Determine, for the cycle,
the pressure and temperature at each of the cycle process
change points,
[8]
the work done/kg gas,
[4]
the thermal efficiency,
[4]
the work ratio,
[3]
the mean effective pressure,...
An ideal diesel engine uses air as the working fluid and operates with a thermal efficiency...
An ideal diesel engine uses air as the working fluid and operates
with a thermal efficiency ?th =0.5 with a rate of heat addition
Qin=120 kW. The temperature at the beginning and the end of the
addition heat (combustion) are respectively: T2=900 K and T3=2100
K. Assume constant specific heats (Cp and Cv). The air properties
at a room temperature T1=293.0 K are: Cp=1.005 kJ/kg.K,
Cv=0.718KJ/kg.K, the gas constant of air is R=0.287 kJ/kg.K and the
ratio of specific heats...
An ideal diesel engine has a compression ratio of 20 and uses air as the working...
An ideal diesel engine has a compression ratio of 20
and uses air as the working fluid. The state of air at
the beginning of the compression process is 95 kPa and 200C. If the
maximum temperature in the cycle
is not to exceed 2200 K,
Determine:
a) The thermal efficiency, and
b) The mean effective pressure, and
Assume constant specific heats for air at room temperature.
An ideal diesel engine has a compression ratio of 20 and uses air as the working...
An ideal diesel engine has a compression ratio of 20 and uses
air as the working fluid. The state of air at the beginning of the
compressor process is 100 kpa and 27 C. The maximum temperature in
the cycle is 2200 K and the cutoff ratio is 1.2
Determine the following:
The internal energies at the beginning and the end of the
compression
The enthalpy before and end of the combustion
The internal energy before and end of the...
Consider an automobile engine which operates on the ideal Otto cycle. In this engine, air is...
Consider an automobile engine which operates on the ideal Otto
cycle. In this engine, air is compressed with a compression ratio
of 10. At the beginning of the compression process, air is at 105
kPa and 17oC, and in the combustion process 640 kJ/kg of heat is
added to air. Taking into account the variation of specific heats
with temperature, determine (a) the pressure and temperature at the
end of the heat-addition (combustion) process, (b) the net work
output, (c)...
The compression ratio of an ideal air-powered Diesel cycle is 20. At the beginning of the...
The compression ratio of an ideal air-powered Diesel cycle is
20. At the beginning of the compression process, the pressure of
the air is 100 kPa, the temperature is 20 ° C, and the highest
temperature of the cycle is required not to exceed 2250 K. Show the
cycle in the P-v diagram. Accept specific temperatures constant at
room temperature.
k=1.4 CP=1.005 kJ/kgK CV=0.718 kJ/kgK R=0.287 kJ/kgK
a) Calculate the temperatures entering and leaving the cycle,
the thermal efficiency of...
A CI engine operating on the air standard diesel cycle has cylinder condtioons at the start...
A CI engine operating on the air standard diesel cycle has
cylinder condtioons at the start of compression of 65 degrees C and
130 kPa. light diesel fuel is used at an equivalence ratio of 0.8
with a combustion efficiency of 0.98. compression ratio = 18
Calculate:
temperature and pressure in each state of the cycle (0c)
pressure at each state of the cycle (kpa)
cutoff ratio
indicated thermal efficiency (%)
heat lost in exhaust (KJ/Kg)
A mole of an ideal gas goes through a cycle of a Carnot engine. Draw the...
A mole of an ideal gas goes through a cycle of a Carnot engine.
Draw the pressure vs volume and entropy vs temperature planes for
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the cycle is 50% and 99%. Then Calculate the work done per cycle by
the gas and find the efficiency of the cycle.
The state at the beginning of compression of an air-standard Diesel cycle is fixed by p1...
The state at the beginning of compression of an air-standard
Diesel cycle is fixed by p1 = 100 kPa and
T1 = 310 K. The compression ratio is 18 and the
cutoff ratio is 1.5.
Determine:
(a) the maximum temperature, in K.
(b) the pressure at the end of the expansion, in kPa.
(c) the net work per unit mass of air, in kJ/kg.
(d) the percent thermal efficiency.
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