Question
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In car engines, write out what stands for.
A four-stroke 2 -cylinder internal combustion engine running at the sp
of , has a bore and stroke length of and respectiv
The engine develops a brake torque of , while the volume
efficiency is 0,85 . The air-fuel ratio by volume is . The fuel used in this ens
has a calorific value of .
Calculate:
5.2.1 The engine’s brake power in kW
5.2.2 The mean speed of the engine’s pistons in
5.2.3 The engine’s swept volume in
i.2.4 The engine’s induced volume in
2.5 The brake thermal efficiency

Ask by John Martinez. in South Africa
Dec 06,2024

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Answer

  • 5.2.1 The engine’s brake power is approximately 15 kW.
  • 5.2.2 The mean speed of the engine’s pistons is approximately 2.87 m/s.
  • 5.2.3 The engine’s swept volume is approximately 0.067 m³.
  • 5.2.4 The engine’s induced volume is approximately 0.114 m³/s.
  • 5.2.5 The brake thermal efficiency is approximately 1.94%.

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Mind Expander

In the context of car engines, commonly stands for “stroke,” which is the distance traveled by the piston within the cylinder between its topmost and bottommost positions. This measurement is crucial for understanding the engine’s displacement and overall performance, as it directly influences the engine’s power output and efficiency. The stroke is typically measured in millimeters or inches.
To solve the power and efficiency calculations, it’s important to understand the four-stroke cycle involved in internal combustion engines. Each two revolutions (720 degrees) of the crankshaft corresponds to one complete cycle of intake, compression, power, and exhaust strokes. Knowing the engine specifics, such as bore, stroke, and engine speed, allows us to calculate metrics like brake power and efficiency - factors key to optimizing performance and fuel consumption.

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