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compression ratio is 8.8:1, not sure what the question is asking
Step 3: Fuel Delivery at Max Power: At maximum output, calculate what the fuel-per-cycle quantity would be by using a 15:1 ai
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Answer #1

Given that,

air fuel ratio is 15:1 for otto cycle and 22:1 for diesel cycle

For NA (naturally aspirating) engine, initial ambient conditions would be : P1 = 101 kPa , T1 = 25o C = 298 K

If the cubic capacity (cc) of the engine, and no. of cylinders (K) are given, the displacement volume (or) swept volume Vs can be found out by :

  Vs= (cubic capacity) / K

If the compression ratio (rk) is given (here it is 8.8) , total cylinder volume V1  (before compression starts) can be found out by :

rk = V1 / (V1-Vs)

Since ideal gas law can be used to find the mass of air, using initial conditions,

M1a = P1 V1 / R T1   (where R is the specific gas constant for air = 287.058, J⋅kg−1⋅K−1)

using this, and air fuel ratio (A/F) =15:1 for otto cycle and 22:1 for diesel cycle,

  A/F = M1a / Mf   (Mf is the mass of fuel per cycle)

Mass of fuel used per cycle can be found out.

The actual calculations can be done by using the values of cubic capacity and no. of cylinders in the engine.

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