Basic Mechanical Engineering (3110006)

BE | Semester-1   Winter-2019 | 03-01-2020

Q4) (a) 

A diesel engine works on Diesel cycle with a compression ratio of 15 and cut off ratio of 1.75. Calculate the air standard efficiency. Assume γ = 1.4.

Given data
r = 15
ρ = 1.75

To Find ηair = ? 

The air standard efficiency of Diesel cycle is,  

ηair =1 -  1γ r γ - 1 ρ γ - 1ρ - 1 

ηair = 1 -  11.4 × 150.4 1.75 1.4 - 11.75 - 1 

ηair = 0.6166 

 ηair = 61.66 % 

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