# Combustion engines Otázka: Combustion engines

Jazyk: Angličtina – Strojírenství

Přidal(a): beatrice.sanvenero

Cylindrical capacity

• Vz=(π⋅D^2)/4⋅Z⋅ⅈ
• D – cylinder diameter
• Z – stroke
• i – number of cylinders

Effective engine power

• Pe=Mt⋅((2π⋅n)/60) = (pe⋅Vz⋅n)/(k⋅60)
• Mt – torque moment
• n – revolutions
• pe – mean effective pressure
• Vz – engine capacity
• k – coefficient for four cycle engine k = 2
• Pe=mP⋅Hu⋅ηc
• mp – weight fuel flow into engine (kg/s)
• Hu – fuel value (J/kg)
• total efficiency of an engine

Mean effective pressure of the engine cycle

• pe=(k⋅60⋅Pe)/(Vz⋅n)

Mechanical efficiency of an engine

• ηC=Pe/Pi
• Pe – mean effective pressure
• Pi – mean inductive pressure

Hour fuel consumption (kg/h)

• MP=Pe/(ηC⋅Hu)⋅36OO

Specific fuel consumption (g/kWh)

• mpe=MP/Pe ⋅1000
• Power is in kw/Pe

Engine torque power

• Mt=Pe/((2π⋅n)/60)
• M – 1 000 000 = 10 6
• K – 1 000 = 10 3

Other:

• Mp=(mpe⋅Pe)/1000
• ηC=(Pe⋅3600)/(MP⋅Hu)
• mp=Pe/(Hu⋅ηC)
• n=(Pe⋅60)/(Mt⋅2π)
• Pe=(mP⋅Hu⋅ηc)/3600