LN11 - Internal Combustion Engines ENGINE CHARACTERISTICS...

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1 Internal Combustion Engines ENGINE CHARACTERISTICS Prof.Dr. Cem Soru ş bay Engine Performance Parameters Engine performance parameters are power , torque and specific fuel consumption . Brake torque is normally measured with a dynamometer – engine is mounted on a test bed and the shaft is connected to the dynamometer rotor. The rotor is coupled electromagnetically, hydraulically or by mechanical friction to a stator, which is supported in low friction bearings. Torque exerted on the stator with the rotor turning is measured by balancing the stator with weights, springs or pneumatic means. The torque exerted by the engine is, The power delivered by engine is, product of torque and angular speed, Brake power is Fb T = NT P π 2 = b P
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2 Engine Performance Parameters Engine Performance Parameters
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3 Engine Performance Parameters Torque (effective) Torque (effective) T e = F . b (Nm) = F . b (Nm) Power (effective) Power (effective) N e = T = T e . . ω (W) (W) N e = Work . Angular Speed = Work . Angular Speed N e = W = W e . . ω = P = P me . V . V h . . ω Engine Performance Parameters N e = (P = (P me me V h n) / (z 60) (kW) n) / (z 60) P me me : MPa V h : liter : liter n : r.p.m (rev per minute) : r.p.m (rev per minute) z = 1 for 2 z = 1 for 2 -stroke engine stroke engine z = 2 for 4 -stroke engine stroke engine
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This note was uploaded on 10/04/2011 for the course ME 422 taught by Professor Cemsoruşbay during the Spring '11 term at Yeditepe Üniversitesi.

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LN11 - Internal Combustion Engines ENGINE CHARACTERISTICS...

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