A nine-cylinder radial aircraft engine has a bore of 5.5 inches and a stroke of 5.5 inches and runs at 3500 rpm. Assuming that the brake horsepower of the engine is measured at 600 hp, calculate the brake mean effective pressure (BMEP) the indicated mean effective pressure (IMEP) (hint: assume an appropriate value for ηmech). Farokhi, Saeed. Aircraft Propulsion (Kindle Locations 12000-12003). Wiley. Kindle Edition.

BMEP = 3.98154 bar

IMEP = 4.9769 bar

Explanation:

Note:BMEP means Brake Mean Indicated Effective Pressure = 3.98154 bar

IMEP means Indicated mean of Effective Pressure =4.9769 bar.

Please go through the attached files for the step by step solution.

The  brake mean effective pressure is  

The  indicated mean effective pressure is  

Explanation:

From the question we are told that

      The number of cylinder is  

       The bore diameter  is

       The stroke is

        The angular speed is  

       The  break horsepower of engine is  

Let assume the mechanical effectiveness = 85%

The mechanical effectiveness of the engine is mathematically represented

the brake mean effective pressure (BMEP) is mathematically represented as

where a is the area of the engine piston which is  mathematically as

 Substituting values

Substituting values into the equation for BMEP

From the equation of

  We have that

the clapeyron equation (also called the clausius-clapeyron equation) relates the slope of a reaction line on a phase diagram to fundamental thermodynamic properties.

explanation: