2. (60 pts) Supercharged Otto-cycle engine: the Pratt & Whitney R-2800 Double Wasp engine used by...

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2. (60 pts) Supercharged Otto-cycle engine: the Pratt & Whitney R-2800 Double Wasp engine used by the Vought F4U Corsair was a 18-cylinder radial with a total engine displacement of 2800 cubic inches and a compression ratio of 6.75:1. A supercharger draws power off the engine shaft to boost the intake pressure by 9 psi with a compressor efficiency of 72%. The efficiency is defined as h2s-hi = 72% ne = he-hi where • state

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1.  (
≡
)(60 pts) Supercharged Otto-cycle engine: the Pratt & Whitney R2800 Double Wasp engine used by the Vought F4U Corsair was a 18-cylinder radial with a total engine displacement of 2800 cubic inches and a compression ratio of 6.75:1. A supercharger draws power off the engine shaft to boost the intake pressure by 9 psi with a compressor efficiency of 72%. The efficiency is defined as
 (
1
)
where
η	h2s − h1  = 72%
 (
c
)h2 − h1
· state 1 is at the intake to the supercharger,
· state 2 is at the exit of the supercharger, and
· state 2s is the state that would be achieved if state 1 were raised is entropically to the same pressure as state 2, as indicated in the T -s diagram below.
For the following questions, assume that air enters the supercharger at a stagnation pressure of 36.79 kPa and a stagnation temperature of 237.6 K.
(a) (10 pts) Use the compressor efficiency to calculate the network per unit air mass [kJ/kg] required to run the supercharger.
 For a given pressure, the adiabatic efficiency of the compressor is calculated as the ratio of the work necessary to operate the compressor under actual conditions to the work required to operate the compressor under ideal conditions,

2. (60 pts) Supercharged Otto-cycle engine: the Pratt & Whitney R-2800 Double Wasp engine used by the Vought F4U Corsair was a 18-cylinder radial with a total engine displacement of 2800 cubic inches...

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