A simplified representation of the Diesel cycle, with just air as the work- ing substance, is as shown in Figure 4-18. Show that the efficiency of this engine is n=1– (1/rð)-(1/rð)` Y (1/re)-(1/rc) where r₁ = V³/V2, the expansion ratio, and rc= V3/V₁, the compression ratio. If r = 5, r = 15, and y = 7/5, evaluate η. Notice that the compres- sion ratio can be much higher in a Diesel engine than in an internal combustion engine. That is because Diesel engines do not suffer from pre-ignition, as the fuel is sprayed in at the end of the compression stroke; this allows an increased rc. This is one reason why Diesel engines are more efficient than internal combustion engines. 4-18 P b C Adiabat d Adiabat V2 20 V3 V
A simplified representation of the Diesel cycle, with just air as the work- ing substance, is as shown in Figure 4-18. Show that the efficiency of this engine is n=1– (1/rð)-(1/rð)` Y (1/re)-(1/rc) where r₁ = V³/V2, the expansion ratio, and rc= V3/V₁, the compression ratio. If r = 5, r = 15, and y = 7/5, evaluate η. Notice that the compres- sion ratio can be much higher in a Diesel engine than in an internal combustion engine. That is because Diesel engines do not suffer from pre-ignition, as the fuel is sprayed in at the end of the compression stroke; this allows an increased rc. This is one reason why Diesel engines are more efficient than internal combustion engines. 4-18 P b C Adiabat d Adiabat V2 20 V3 V
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![A simplified representation of the Diesel cycle, with just air as the work-
ing substance, is as shown in Figure 4-18. Show that the efficiency of
this engine is
n=1–
(1/rð)-(1/rð)`
Y (1/re)-(1/rc)
where r₁ = V³/V2, the expansion ratio, and rc= V3/V₁, the compression
ratio. If r = 5, r = 15, and y = 7/5, evaluate η. Notice that the compres-
sion ratio can be much higher in a Diesel engine than in an internal
combustion engine. That is because Diesel engines do not suffer from
pre-ignition, as the fuel is sprayed in at the end of the compression
stroke; this allows an increased rc. This is one reason why Diesel engines
are more efficient than internal combustion engines.
4-18
P
b
C Adiabat
d
Adiabat
V2
20
V3 V](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F698145ac-df3f-4563-a82f-ea5332c53d66%2Ff326a3d2-f9e2-4083-8b47-33089b832366%2Fj4gd0k_processed.png&w=3840&q=75)
Transcribed Image Text:A simplified representation of the Diesel cycle, with just air as the work-
ing substance, is as shown in Figure 4-18. Show that the efficiency of
this engine is
n=1–
(1/rð)-(1/rð)`
Y (1/re)-(1/rc)
where r₁ = V³/V2, the expansion ratio, and rc= V3/V₁, the compression
ratio. If r = 5, r = 15, and y = 7/5, evaluate η. Notice that the compres-
sion ratio can be much higher in a Diesel engine than in an internal
combustion engine. That is because Diesel engines do not suffer from
pre-ignition, as the fuel is sprayed in at the end of the compression
stroke; this allows an increased rc. This is one reason why Diesel engines
are more efficient than internal combustion engines.
4-18
P
b
C Adiabat
d
Adiabat
V2
20
V3 V
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