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)
  • M_t – torque moment
  • n – revolutions
  • p_e – mean effective pressure
  • V_z – engine capacity
  • k – coefficient for four cycle engine k = 2

• Pe=mP⋅Hu⋅ηc
• • m_p – weight fuel flow into engine (kg/s)
  • H_u – 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