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Predicting Trends in Engine Performance a) Write an expression for bmep in terms of the thermal efficiency,...

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Mechanical Engineering

Predicting Trends in Engine Performance

a) Write an expression for bmep in terms of the thermalefficiency, mechanical efficiency, volumetric efficiency, andcombustion efficiency, as well as other engine design parameters.Group terms together that are related to engine thermochemistry,engine fluid mechanics, and engine kinematics/machine design.Identify each of these groupings.

b) Write an expression for the brake specific fuel consumptionin terms of the mechanical efficiency, thermal efficiency, andcombustion efficiency as well as the heating value of the fuel.

c) Reasoning with your equations, indicate the sign (+, -, or 0)of the likely change in bmep and also in bsfc based on modificationof the design or operating parameter. Assume that all otherdesign/operating conditions remain the same. Provide a shortrationale for each answer.

- Increasing ambient temperature

- Decreasing ambient pressure

- Increasing engine displacement

- Increasing the air/fuel ratio

- Using a lower viscosity lubricant

- Improving intake/exhaust tuning

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