Consider the thermodynamic efficiency of a Diesel engine. Using equation (2.73) of your textbook, plot the efficiency of this type of engine for injection ratios ρ between 1and 5 (incrementing by 1) at compression ratios ε of 18, 20, 22, and 24. Note that this is ηth vs ρ plot at the stated ε values. Describe your observations. Use MATLAB to plot the graphs
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